Thank you for the pics. Do you have any of the manuals? It seems information on this beauty is rather scarce.
User manual Japanese language only! so if want to calibration process to hard!
How to runing calibration dmm?
Thank you for the pics. Do you have any of the manuals? It seems information on this beauty is rather scarce.
I uploaded it here (https://www.dropbox.com/s/67vd6qj0ob7mh5h/R6581%20manual.pdf?dl=0), how's your Japanese? >:D
I've bugged Rohde & Schwarz to see if they can give me any more info, they're the Advantest distributors in Australia.
(Strangely enough, page 584 appeared to already be OCR'd).
Also R6581 got a lot of improvements during its production. Some of my early research is here:
Also R6581 got a lot of improvements during its production. Some of my early research is here:Interesting project. If it helps, I can take pictures of a meter made in ~98 (at least the ref board has 3 hermetic resistors and plastic OPA).
Interesting project. If it helps, I can take pictures of a meter made in ~98 (at least the ref board has 3 hermetic resistors and plastic OPA).Thank you for the suggestion. The most interesting thing is a AC subboard and its interconnection.
Does it means the issue is not so serious and can be fix by the self of external calibration?
How does that work out so cheap?The answer is very simple ;D
I also check the power supply for U105 , v+=13.6 , V-=-15v , it's ok.It isn't Ok, but not critical.
Must I connect the guard port together with the HI,LO,HI SNESE, LO SENSE port?Guard must be connected. Have you seen this post? https://www.eevblog.com/forum/repair/advantest-r6581-8-5-digit-dmm-mini-teardownrepair/msg1397797/#msg1397797 (https://www.eevblog.com/forum/repair/advantest-r6581-8-5-digit-dmm-mini-teardownrepair/msg1397797/#msg1397797)
What the zero offset should be and could you told me the number in your 6581?
... zero offset is around 1uv and it is not so stable runing from 100nv to 4.5uv range. The meter has warmed up for about 8 hours. Is it fine?It's absolutely not fine :( At least the measurements that I just carried out showed DCV zero about 300 nV with +-250 nV span (100 samples, 100 mV range, 10 PLC, AZERO On).
Does it means the issue is not so serious and can be fix by the self of external calibration?How does that work out so cheap?The answer is very simple ;D
I just performed the external zero and DCV calibration and left OHM undo because no accuracy 10K res inhand. Is it the reason for the DCI zero and fullscale issues?How can you check a DCI fullscale with low-end 6144 and 34401A? So I sees only a large DCI zero offsets and these offsets are not related to external OHM calibration. Some of the possibles sources of the leakage current are U503 MAX327 switches (100 nA and 1000 nA ranges), protection transistors Q502-Q503 and MUX hybrid U001 pin 3,4,5.
The 6581 has only the 10plc -100plc setting, so 10plc is ok?Advantest R6581 have an integration time settings in range of 1 us...100 PLC.
Hi, Mr. Kleinstein ,
Thanks a lot!
How can I test the bias? By connect the 10M res ? I had checked it yestoday and got 0.2mv when AZON and 0.02mv when AZOFF on 10V range. I forgot to test them on 1V and 100mV range and will comfirm it tonight.
Further information,my firend had comfirmed that his 2pcs 6581 also have the same issue in 1V/10V INL ,which is about 5-7ppm, refer to 1V range. And he told me that the error is about 1.5-1.6ppm when in cold state and become larger when in warm state. He use the 732b output 1v for testing.
Best Regards,
szszjdb
The error between the 10v and 1v input have reached 11uv, that is exactly the error when in 10v-1v transfer test.These 11 uV isn't nonlinearity.
I havn't found the schematics for the DC amplifier. It might take some time to draw it.Have you looked in private messages? I sent you a link to PDF doc.
Calibration did not get lost on mains power cycle either, perhaps it is stored in non-voltatile ROM and not backed up by battery? That would be great, another item better than HP 3458A.
And yes, I figured this out the hard way and now have a few 6581 spare parts...More details please, what failed?
I did few quick checks on R6581T. This is definately not the "replace the fuse and she'll be alright" repair here. :-- :box:
There is wierd issue with resistance ranges 100Kohm and higher, showing consistant error over 300 ppms, even after fresh ext cal.
I've used uncalibrated 5700A for this test and linearity test, and my FX protoref for 10V log.
A simple repair with just replace the fuse and maybe all the electrolytic caps is much less fun than such a hidden fault causing poor performance.Yea, indeed. However current schedule do not permit such time investment. Will do some more testing, but more in depth troubleshooting will be for later on.
There is wierd issue with resistance ranges 100Kohm and higher, showing consistant error over 300 ppms,I have found a similar problem with 10 MOhm (and possibly 100 M and 1 GOhm) range: 100 k -> 1 M transfer error is about 1 ppm, but 1 M -> 10 M gives a repeatable +150...+180 ppm multiplicative error |O
Critical bug-fix for R6581T with firmware 004246-A02/007342-A01, 2006 yr.Yes,This is a big bug!
Errata: an erroneously swapped bits in the relays control word are breaks the switching sequence of K006 relay and leads to large thermal EMF due to overheating.
Critical bug-fix for R6581T with firmware 004246-A02/007342-A01, 2006 yr.
Errata: an erroneously swapped bits in the relays control word are breaks the switching sequence of K006 relay and leads to large thermal EMF due to overheating.
Sounds like you got some data for this meter.Unfortunately no. But I have found another bug ^-^
Critical bug-fix for R6581T with firmware 004246-A02/007342-A01, 2006 yr.Hi, Mr. Mickle.T
Errata: an erroneously swapped bits in the relays control word are breaks the switching sequence of K006 relay and leads to large thermal EMF due to overheating.
I has the same relay drive voltage.Oh,I see.Thank U! :-+
I has the same relay drive voltage.After patch, It's OK!
I am not sure the 34401 is sensitive enough to see a possible effect of the input on the +17 or -19 V reference. The problem is that this would need the 100 V range and would thus likely be not easy to measure. One should however be able to see individual ground points shifting - however here the problem is of deciding where to have the real ground.I can measure using two 2002's, which have 20V base DCV range, if someone guide me thru setup and points to measure.
A different timing in 100 PLC mode realized as 10x10 PLC3458A does same thing, AFAIK.
Would the simultaneous measurement of Vin at 6581T input AND at the 6581T AD IN node give more insight on this matter, to determine where error come from? I can use two 3458s for that.
...This the way I would apply different voltage for the tests. There is no need for exact starting points, it just helps if the whole range in covered. Depending on the input current, one could get away with starting at 10 V or -10 V and than just wait for the capacitor to charge / discharge.
Would you please give me some advice on the detail to add the voltage with the cap. Parellel the cap with the HI/LO port,feed the input with a voltage source setting at 1V, and then plug out the feed line?
......
Best Regards,
szszjdb
The one point I find a little odd with the amplifier is the way the guard driver for the JFET input switches is handled. It can take quite some time for U107 to settle ( the OP07 has a rather limited slew rate) and this could cause quite some leakage current through the JFETs, when switching from a positive voltage down.The amplifier's precision channel have the same OP07D (U104) in the signal path. There are another odd thing with JFET switches: R083 C026 series circuit.
szszjdb, can you makes some measurements, please. I found a huge Ohms transfer error from 1 MOhm to 10 MOhm ranges. With 1 MOhm resistor I get a 180-200 ppm difference (temperature independant)All ranges 100K and higher have big errors on mine too, so I can do measurements, just tell me what to do :). I have meter moved to workbench again, so I'll play with it soon again.
I got my Advantest R6581 today :-+How about some experiments >:D
I got my Advantest R6581 today :-+How about some experiments >:D
1) Internal Cal ALL. Set 10 VDC range, AZERO ON, input short, Null. Connect external 10 V source, then measure a voltage difference between +10 V and -10 V readings.
2) Connect external 1 MOhm resistor and measure its value on the 1 MOhm and 10 MOhm ranges (OCOMP OFF, AZERO ON).
...1 and 10 Meg transfer in your DMM is almost perfect. I can't understand why all of these 6581x are so differents |O
1 Megaohm resistor test results:
R6581T
999.80555 - 1 Meg : deviation = -195 ppm
00.999785 - 10 Meg : deviation = -251 ppm
...
Also can anyone confirm that VFD high-voltage is indeed AC voltage? VFD brightness is really dim, and it's unusual to me that VFD has AC drive for both segments and filaments. I've attached fuse F1 and F2 (near front panel FPC connectors) oscilloscope waveforms measured voltage vs GND.
Sorry guy's but get the same results with inverting the polarity, if your meter does not do that you should look to fix it!
Sorry guy's but get the same results with inverting the polarity, if your meter does not do that you should look to fix it!
You can help our community to repair DMMs even by making just one high-res photo of your PCB.
Sorry guy's but get the same results with inverting the polarity, if your meter does not do that you should look to fix it!
You can help our community to repair DMMs even by making just one high-res photo of your PCB.
How about some experiments >:DIf it helps, here are some readings
1) Internal Cal ALL. Set 10 VDC range, AZERO ON, input short, Null. Connect external 10 V source, then measure a voltage difference between +10 V and -10 V readings.
2) Connect external 1 MOhm resistor and measure its value on the 1 MOhm and 10 MOhm ranges (OCOMP OFF, AZERO ON).
I can't see any difference with my R6581T :-\
I had checked the waveform of the control gate voltage of PIN14, PIN17 and PIN20 of MUX ,together with the ADIN in the yellow channel.I had the same waveforms.
Video on TiN server that show that I'm not telling "fake news"Well, I watched it, and Mr. eurofox misled us, as meter he has is 6581T , not the real 6581. No wonder Mickle.T. did not see any difference :palm: .
Little bird show me photo of (later?) R6581T, which have DCV 300V PK MAX Input labels.
Seems like Advantest were not able to make up mind about 6581 specs for a while. :)QuoteVideo on TiN server that show that I'm not telling "fake news"Well, I watched it, and Mr. eurofox misled us, as meter he has is 6581T , not the real 6581. No wonder Mickle.T. did not see any difference :palm: .
Idea is that they are the same, but in reality lot of issues with T-units we all see here leave us wondering if real 6581 actually meet the specified specs and 6581T is just reject units, or actually there are design changes/different parts that give 6581 higher performance.
Idea is that they are the same, but in reality lot of issues with T-units we all see here leave us wondering if real 6581 actually meet the specified specs and 6581T is just reject units, or actually there are design changes/different parts that give 6581 higher performance.
are the issues faced by Mickle T., szszjdb and you shared by eurofox, specifically the turn-over error?
regards.
-zia
btw. does anybody have a source for the display used in the meter?I found only this way: http://bbs.38hot.net/forum.php?mod=viewthread&tid=2014&extra=&page=1 (http://bbs.38hot.net/forum.php?mod=viewthread&tid=2014&extra=&page=1)
btw. does anybody have a source for the display used in the meter?I found only this way: http://bbs.38hot.net/forum.php?mod=viewthread&tid=2014&extra=&page=1 (http://bbs.38hot.net/forum.php?mod=viewthread&tid=2014&extra=&page=1)
I do respect Advantest for doing the meter in first place, but in my book high-end instrument is not just a piece of hardware, but also documentation (anyone see any document about 6581T?), service procedures and reliability of the internal and external calibration procedures. Yes, long service hours affect instrument aging, stability and bring wear and tear issues. Actually that what is making high-end instrument so, ability to sustain it's tight specifications over the time and use abuse. One can calibrate "cheap" 6.5d DMM and 8.5d DMM to same initial accuracy, but over 1 year, you will see why 8.5d is priced 10 times more.
Single 7V/-7V point does not tell us much, sorry. You need linear source or a reference meter with proven linearity (hello, 3458A/5440/720A-732 etc), to verify issues that multiple people see.
Don't get me wrong, R6581T is nice meter to have, but saying it's on par with other industry proven 8.5d ones is bit over-excitement (unless we find out exact root cause of performance issues).
Or maybe all of the R6581T that multiple people have here are simply broken in various ways, yet pass external and internal calibrations and self-tests, giving a false pass and out-of-spec results.
Running external calibration on Ohms, with 10000.0011 Ohm standard and getting 9999.8791 ohm as result is bit unsettling :).
Given simple statistics we should have at least one person here with R6581T which actually does meet R6581 specs? Maybe it's you? :=\
Fortunately the front panel key system is "so logic" that you don't need a manual to use the instrument much user friendly than the 3458A.Just a matter of habit. I found 3458A very easy to use after programming macro onto numeric keys, so I can get 99% of modes and functions I want in click of two buttons.
I'm afraid this is going to some sort of holy war, which is not necessary, so I'll shut up after this post.
I'm afraid this is going to some sort of holy war, which is not necessary, so I'll shut up after this post.
hey lighten up guys. no WAR only PEACE. (imagine that coming from a Pakistani :-DD)
on a more serious note:
it looks like R6581T is the model specifically designed/selected to go into automated Test racks,
and i think all of the units are coming from some kind of testing setup.
has anybody evaluated the linearity using a fluke 720a kvd? maybe make some kind of a correction table in software?
best regards.
-zia
It seems that the few owner of R6581/T got problems with the instrument, it seems that there NO evidence based on information available that there is a difference between the "base" of the R6581 and R6581T, is the same firmware, on the R6581T all feature to manage AC input is available.
It seems that the few owner of R6581/T got problems with the instrument, it seems that there NO evidence based on information available that there is a difference between the "base" of the R6581 and R6581T, is the same firmware, on the R6581T all feature to manage AC input is available.
well,
an obvious difference is the "T", i have seen japanese manuals and spec. sheets (again japanese) they refer ONLY to R6581 and R6581D, no T anywhere to be found.
a lot of component specification testing goes into manufacturing these 8.5d buggers, and a lot of variance in component selection is there, even the ref module
on an hp 3458a (seemingly simple LTZ1000 ref module) has a couple of versions available at *wildly* variable costs.
it does look like, that the specification for R6581T *is* different and it is a fallacy in my humble opinion to hold it against the R6581 or R6581D specs.
best regards, and always a pleasure to read *fantastic* pieces of knowledge shared by you guys.
-zia
i have asked the adcmt company for the specifications sheet for the T version, so let us keep our fingers crossed.
i agree with you, the specs may turn out to be exactly like R6581/D or maybe not, or not available at all.
regards.
-zia
i have asked the adcmt company for the specifications sheet for the T version, so let us keep our fingers crossed.
i agree with you, the specs may turn out to be exactly like R6581/D or maybe not, or not available at all.
regards.
-zia
Maybe you missed my last message because I edit it, I double check and when I start the instrument it indicate R6581D why?
eurofox
my R6581 says R6581 and has AC function
(https://www.eevblog.com/forum/metrology/advantest-r6581-8-5-digit-dmm-mini-teardownrepair/?action=dlattach;attach=409331)
Any chance you can dump firmware for us, please? :-DMM
Little bird show me photo of (later?) R6581T, which have DCV 300V PK MAX Input labels.
Seems like Advantest were not able to make up mind about 6581 specs for a while. :)QuoteVideo on TiN server that show that I'm not telling "fake news"Well, I watched it, and Mr. eurofox misled us, as meter he has is 6581T , not the real 6581. No wonder Mickle.T. did not see any difference :palm: .
hello friends,You mean the custom rack mount? Perhaps they had some kind of shield to protect the inputs from draughts and/or factory workers accidentally unplugging leads and putting them back wrong? :-DD
can anyone explain the oddity in the following pictures?
-zia
more results coming...
the linearity is not bad when using negative polarity input.
For the long time since last CAL, it depends on the applications. In some cases you may not need a calibrated meter, and with higher speed measurements the cal requirements are not that stringent as resolution limits the accuracy. The more important point would be to check those modes for something like settling time if not done properly in the self test. The odd thing is that there are usually no accuracy ratings for a 10 year cal cycle.
My DMM comes with manufacture's calibrated seal.more results coming...
the linearity is not bad when using negative polarity input.
Maybe a good idea is to check the voltage PPM <> when you change polarity.
The calibration sticker show last calibration in 2005 valid for 10 years :palm:
This instrument is in 2018 not calibrated during the last 13 years :palm: :palm:
This is what I get on my R6581T:
My DMM comes with manufacture's calibrated seal.more results coming...
the linearity is not bad when using negative polarity input.
Maybe a good idea is to check the voltage PPM <> when you change polarity.
The calibration sticker show last calibration in 2005 valid for 10 years :palm:
This instrument is in 2018 not calibrated during the last 13 years :palm: :palm:
This is what I get on my R6581T:
turn off the AZ, and check again. or use a low output impendence voltage source to do the test.
This is what I get on my R6581T:
turn off the AZ, and check again. or use a low output impendence voltage source to do the test.
I just check it without AZ and get the same results.
I can not locate C120 - but from the numberSorry, it's my bad :(
Thank you for your inquiry.:palm:
R6581T was presented to market as affiliated equipment for IC Test
System by ADVANTEST.
Please contact and request for the data sheet with ADVANTEST.
I can not locate C120 - but from the numberSorry, it's my bad :(C223.
The answer from ADCMT apps engineer:QuoteThank you for your inquiry.:palm:
R6581T was presented to market as affiliated equipment for IC Test
System by ADVANTEST.
Please contact and request for the data sheet with ADVANTEST.
Hi, Mr.Kleinstein,
Thanks a lot!
All the test with the PROTECT off and GUARD low setting in AZ mode. I also notice something odd with the bigger noise in the reading when in INL test by resistor mode.The resistor string is powered by the LTZ10V with battery and the reading should have the same noise performance with LTZ10V(around 1uv), but sometime reached 5-6uv max.. So I was wondering if the protect cap will leading to that , then just turn off the PROTECT and set GUARD low, but no obvious change. Anything missing?
Best Regards,
szszjdb
The transfer error are like the old one in DCV mode and are improved much from 200ppm to 20ppm in OHM mode. Might benefit from the modifying of the OPs.This is an excellent result! Could you list all the changes made?
I kind of have a feeling (and some indication from some earlier scope results), that the average integrator voltage could be more like constant with some odd variations in the negative side and about a parabola for the positive side. This could be roughly the shape of the observed INL.Exactly, that was my deduction too.
waveform at ADIN point with AZON under +10v input?
Another part that may be worth testing is the error with large resistors. One point to check here is to test a few more resistors (e.g. 100K, 200 K, 500 K, 700 K) instead of just 1 MOhms in the 1 M and 10 M range.I was already did it with all of the 1, 10, ... 1E6 Ohm range. Current source is extremely linear and don't have a measurable INL. Also I was check a currents settling problem with a 10 nF capacitor, added to the 900 k current shunt resistor (R500). After ACAL I was got the same 200 ppm shift. Changes of the U405 compensation string R*C405 also gives nothing. Decreasing by half of bootstrap resistors R406 gives nothing. Aforemention U107 mod gives nothing. Disabling of the D402 (overcurrent protection) also gives nothing, as well as variation of ambient temperature in large range.
uploaded the A03 firmware. :popcorn:Thanks. Is the smaller flash still the same (A02)?
It looks like one byte was changed (apart from stepping revision numbers).This byte is a part of 32-bit floating point number, used in calibration math procedures.
It looks like one byte was changed (apart from stepping revision numbers).This byte is a part of 32-bit floating point number, used in calibration math procedures.
It looks like one byte was changed (apart from stepping revision numbers).This byte is a part of 32-bit floating point number, used in calibration math procedures.
Report of R6581T that pass all tests:God, what a mess!
Report of R6581T that pass all tests:God, what a mess!
-100V (Short) Tolerance- is -0.300063V It's a joke?
All of DCV (and other) tolerances span are 10 times bigger, than DMM's spec. DMM fails almost all :palm:
That test mainly showed the calibrator is by far not up to the task. Even if the test results are outside the meters specs, it is well possible that the calibrator that cases the error.That refer to eurofox data, I'd believe :).
The large drift of the resistance readings of the 6581 could be due to the meter not been used for quite some time before. This can cause quite some drift for the initial phase. The ohms circuit is not build for low drift and may rely on regular ACAL cals.I agree on drift point, as 6581 indeed was collecting dust unpowered for months before. But I'd still expect ACAL to perform in 24hr-spec accuracy transfers for all functions/ranges.
I think TiNs cal check table has quite some odd points with the uncertainties. Somehow values relative to full scale and measured value are mixed / not combined.
Though not part of the official specs and test procedure, it might be a good idea to check the input current at different levels of input voltage...Noted, will do, but it's low in priority chain.
The discharge is really very slow: around 1600 seconds for a 1 V drop and thus around 3.5 pA. This is well in the range of random leakage currents. This is an exceptional good value - nearly to the point of having some doubt in the capacitor value. Typical DMM specs are more like < 50 pA. The current does usually depend on the voltage and could be different with a negative voltage.
The more tricky range is the negative sign, especially negative voltage with AZ mode, as there likely is some extra current pulse from AZ switching.
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PANEL CHECK
+291,"Communication error (from main to panel)"
There is a cut in pcb...
Do we have picture or schematics of R19002 scanner card (photo mos relay) or R19003 scanner card (mechanical relay)?
Do we have picture or schematics of R19002 scanner card (photo mos relay) or R19003 scanner card (mechanical relay)?Here you go. :)
It sucks, if the meters t.c. dominates a 24h measurement of a LTZ1000 reference,It does? Isn't the whole point of a voltage reference to be stable? More stable than the measurement tools available?
[..]
I just checked my R6581 and silkscreen and orientation of cap is matching.
Therefore this problem seems to be corrected.
With quite some error at +-1 V the ACAL scale factors between the ranges may be off quite a bit.
Multiple capacitor solutions come into mind:
1. better polypropylene foil capacitors
2. C0G/NP0 capacitors
3. Mica capacitors
Die verlustärmsten Kondensatoren sind mit Glimmer, Teflon, Polystyrol oder Polypropylen aufgebaut. Der s.g. Verlustfaktor D wird auch Dissipation Faktor DF, oder Winkel tangens delta genannt. Er wird angegeben bei 1kHz und 20°C und liegt bei Folienkondensatoren im Bereich von 0.005-0.00001 bei Elkos: >0.3-0.02 bei 120Hz (je kleiner desto besser !). Der Verlustfaktor steigt mit der Frequenz. Der Kehrwert dieser Kenngröße wird als Güte oder Qualitätsfaktor bezeichnet. Manchmal wird der DF auch in Prozent angegeben z.B.: 0.1% = 0.001.
Die Ursachen der Verluste sind neben den Dielektrikumverlusten die aufbaubedingten Fehler: Die gering vorhandene Induktivität (Wickeltechnik), der Widerstand der Anschlußdrähte und deren Kontaktierung (Lötstellen bzw. ferromagnetische Materialien). Die Widerstandsverluste, insbesondere bei Elkos, werden als serieller Verlustwiderstand zu dem Wert ESR (Equivalent Series Resistor) zusammengefasst. Dieser liegt in der Größenordnung von 5-30mOhm. Die Induktivität (Größenordnung 10-200nH) bewirkt, daß ein Kondensator ab einer oberen Grenzfrequenz (Resonanzfrequenz) nicht mehr als solcher arbeitet, sondern als Spule. Die obere Grenzfrequenz kann bei Elkos schon bei 10kHz liegen ! Bei Folienkondensatoren liegt der Wert bei einigen MHz.
Eine weitere, selten im Datenblatt (nur bei MIL) angegebene Verlust-Kenngröße, ist die Dielektrische Absorption DA (in %) (>> Kabel). Sie beschreibt eine Art Gedächtniserscheinung bei Kondensatoren (recovery voltage, memory-effect). Ein geringer DA scheint immer dann vorhanden zu sein, wenn der Tangens-Delta auch gering ist. Geringste Werte liefern PS, PP, Glimmer und Teflon Kondensatoren. Die Größenordnung reicht von ca. 0.01% bei hochwertigen PP-Kondensatoren bis >10% bei Elkos und MPs. Ungepolte Elkos sind etwas besser. Erstaunlicherweise besitzen oft ältere hochgeschätzte Ölpapierkondensatoren einen recht hohen DA-Wert von 2 bis zu 20% ! Tolerierbar ist eigentlich nur ein Wert bis 1%. Glücklicherweise läßt sich der Einfluß eines hohen DA-Wertes durch eine niederohmige Beschaltung stark verringern (z.B. beim Einsatz in Frequenzweichen).
Ein hochwertiger Kondensator wird mit einer Kapazitätstoleranz von 0.5-5% geliefert (Elkos 10-20%).
Dielektrikum | Konstante ( etar ) | Verlustfaktor (tangens delta)
Keramik >50 0.001
PP 2.3 0.001- 0.00005
PS 2.5 0.0001-0.0003
Glimmer 4-8 0.0001-0.0002
Ölpapier 3-4 0.0001-0.0002
Luft 1 < 0.00001
(https://elektroniktutor.de/bauteilkunde/bt_pict/c_tan.png)
(https://www.darc.de/fileadmin/filemounts/referate/ajw/Onlinelehrgang/a03/bild3-09.gif)
Somebody else might say: Ah, the maximum nonlinearity of the 3458A in the diagram seems to be about 0,11 ppm. Add 50 % (since that value entered the average used as reference) gives 0,165 ppm.I do love my 3458s. I didn't quote understand where you get 50% from and why we need to add it? Care to elaborate a bit more?
To check if leakage (e.g. at U213/1) or bias current (variations in input current to the AD707 from signal spikes) to the auto zero cap could be an issue, one could for a test increase the value of C208 (e.g. +22 nF). This would reduce a leakage effect there, and should not yet interfere to much with the zero phase.
I suggest adding some more capacitance. The idea is to reduce the voltage cause by leakage currents without disturbing the zero phase too much - thus not too much extra capacitance, but just enough so that an effect would be well visible. The capacitor type should not be so critical, as the voltage should be pretty stable and low (equal to the offset voltage). The Zero phase likely starts with some offset from the comparator and than settles to the lower offset of U205. The R_on of U213 and U214 may effect the settling speed, but I would expect plenty of time (at least in 1 and 10 PLC mode) and no dependence on the input signal. The 10 Ohms from R222 are misleading with a switch resistance of some 1.5 K in series.QuoteTo check if leakage (e.g. at U213/1) or bias current (variations in input current to the AD707 from signal spikes) to the auto zero cap could be an issue, one could for a test increase the value of C208 (e.g. +22 nF). This would reduce a leakage effect there, and should not yet interfere to much with the zero phase.
You mean decrease C208 to 22nF, as it is already 33nF Polyester type or parallel it with additional 22nF?
I already had C208 in mind and though, replacing it by some different material cap might change something.
-branadic-
For example: Put a short over pins 14 and 15 of U214 to make the 21.5 nF lossy capacitor into a good one.
One possible point to try could be changing the substrate voltage for the switch FETs, especially a little more negative (e.g. another 10-20K in parallel to R214). As far as I can see from the data-sheet to the BSS83 (similar FET) a more negative substrate voltage would shift the threshold up, so that less cross conduction would happen.
Spikes on the substrate voltage could be an issue too.
A point worth checking may be the voltage at U203 Pins 6 (LT1056 in the +1024 current source). If this is more negative than some -4 V, there could be a problem with Q201.
An odd point is that I can't find local decoupling for U206 and U207. Normally this is a kind of no go for such a fast OP. The caps for there supply are quite a bit away.
Maybe he should repeat his measurement for an interval from 1.00 to 1.01 V with the same number of steps so that we can see the fine structure of the nonlinearity curve.
Maybe the instrument is perfectly linear on the large scale and the whole confusion stems from aliasing.
And if you proceed from the opposite? Connect 5.6 kOhm not to -15 V, but to + 15V?
For the OPs there is a report on OP linearity (Samuel Groner 2009) that include the OPA2604 and OPA2132
There is also a chance that just having local decoupling could improve the settling enough, that there is may be no more need for a different OP. Once the settling is good enough there should be little change if the GBW changes with current.
I am not sure if I overlooked anything, but if the voltage source is just not linear enough, you can not get good DMM results. At least that could explain, why all suggested improvement did not give better results.
The LM35 temperature sensor is located near the input muxю
During the last 3.5 years I was reading between 36 and 43°C.
Out of curiosity, what do you do with your temperature measurements?These temperature measurements simply accompany long-term drift measurements :)
I also change the R2 and R3 to metal foil type and add the C4 47UF for the power rail. It might be useful to the long-term stability.
I also tried the C5 with 22nf but found some oscillation occurred, so removed it.
(https://doc.xdevs.com/doc/Advantest/R6581T/img/adv_refz_1.jpg) (https://doc.xdevs.com/doc/Advantest/R6581T/img/adv_refz.jpg)
Few more photos on article WIP. (https://xdevs.com/fix/r6581t/#ltzpcba).
Shematics R6581 v.5
Great. Even though I had Mickle's zipped folder, I didn't know this existed. Thank you for pointing this out.
I have a R6581 on the way to me with damaged front banana jacks and no display, I haven't read the full thread yet but a few questions regarding these meters.
Are the front and rear banana jacks interchangeable ?
Does anyone know what the model number of VFD is so I can research if it's still available, I'm guessing it will most likely be Noritake Itron VFD though I'm hoping the blank display is just power supply trouble.
Are the front and rear banana jacks interchangeable ?
Talk to Pipelie about a new screen. He charges a reasonable price and still has a few spares. I just received one from him and it is identical to the original.
And just for completeness I received two 3D printed adapters with a ceramic filled resin today, so I changed the front adapter and also installed the rear binding posts. There is no drilling or other modification needed, just simply install the binding posts to the adapter and screw it down to the chassis.
-branadic-
Incorrect scheme, from the manufacturer.
Expand the capacitor.
(http://img.radiokot.ru/files/98285/thumbnail/244lni4kc2.jpg) (http://img.radiokot.ru/files/98285/244lni4kc2.jpg)
Wrong.
(http://img.radiokot.ru/files/98285/thumbnail/244lng7f2k.jpg) (http://img.radiokot.ru/files/98285/244lng7f2k.jpg)
Circuit diagram.
(http://img.radiokot.ru/files/98285/thumbnail/244lnh4qd4.jpg) (http://img.radiokot.ru/files/98285/244lnh4qd4.jpg)
Right.
If in doubt, one could just measure the voltage at the cap. They may survive the wrong polarity for some time.
Have you altered the control of the K006 relay? This must be done.
But I do not see the need to replace the resistors.
Question to all R6581 owners, would you like to contribute translating the instruction manual? I already started with the index, but to be honest, there are a lot of pages. But if everyone contributes only a little piece, we would then be able to put things together faster and could have a full manual soon.
I do have the japanese OCR pdf-file transfered into an .odt file and translated, as good as google translate could do the job based on the signs and letters that were detected by the OCR program. Unfortunately sometimes the OCR program failed to detect the proper sign/letter. So there is still a lot of work to do, checking and verifying, putting pictures and tables into a proper state. Anyone interested to support that work?
-branadic-
... attached is my own drafted translation for the Calibration section (with the exception of the 'ADC Commands')...
Here are the first few pages, chapter 13 and the index merged together.
I've added a page with the contributor.
-branadic-
I took a quick glance at the translation of Chapter 13 and found that it is different from the manual I downloaded from xDevs and KO44B. There is no Figure 1 in my version.
just in case anyone is looking for an original AC Option board
I still have one
https://www.eevblog.com/forum/buysellwanted/fs-advantest-r6581-parts-(location-germany)/msg3358518/#msg3358518 (https://www.eevblog.com/forum/buysellwanted/fs-advantest-r6581-parts-(location-germany)/msg3358518/#msg3358518)
just send me a PM
Therefore, reverse engineering of the RMS board is on my to-do list (if, of course, one day I have it).
Interestingly enough, I discovered that the instrument has three internal temperature probes for the DCV, OHM, and AC regions (see 13.6.1 SCPI Commands). It is a nice feature of the remote commands.
There is a minor problem with the binding post mod branadic proposed. The carrier designed for the Lowthermal 2758 binding posts requires using much longer M3 screws to mount than the original sockets. Those screws are connected to guard with their heads are close to the metal front panel connected to PE. Remaining isolation distance may be less then 1 mm. Better drill the 6 mm holes a little deeper and use shorter screws again.
Regards, Dieter
Can anyone speak to this? The manual does not describe it.
Can anyone speak to this? The manual does not describe it.I will have to translate it. :scared:
...
A similar porblem with high ohms is also on the calibrator side - switching and the cables may add errors. So the calibrator / cal lab could in principle also be the problem. Chances are one would need manually connected precision resistors, not a calibrator like FLuke 57xx. The high ohms part may not be used very often.
1) External calibration (as well as internal one) doesn't use any of the user-defined settings in the DMM.
2) The main problem with R6581T is a "T" symbol :) R6581T - is a technological multimeter. It used only for ADVANTEST T2000 IC/SoC/ASIC test system, but not in metrology laboratories. R6581T don't have any official specs or manuals.
In your preliminary report there are results "as found" and "as left". Does that mean they checked once more after adjustment? How is it possible that the 1000 MOhm was adjusted from 953 to 984 and not to 1000? Doesn't that mean the calibration setup was is unstable?
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Mm, a cal report to cruch on. First question I would ask, what is accuracy column exactly mean? :) Voltage 10V point at 0.2ppm? 10kOhm at 0.5ppm? Those are not even 24 hour specs, so :-//?
R6581T I had was very dodgy on ohms at ranges 100kOhm and higher too, and running ACAL always gave different results. Then I have given away the meter to a less fortunate volt-nut, thus resolving the issue and marking R6581T as not worthy to have power of 8.5 digits,
He run the 4W resistor test script. At first, the 10K measurement was way off. Something was wrong! He found that the value was increasing ... It was self-heating ! We indeed were using the 4W high-power mode and the resistor was getting hot.
We changed settings to 4W Resistor LOW power mode, and waited some minutes. Now, this time the SL935 10K measurement agreed to 1ppm. It was spot on.
He run the 4W resistor test script. At first, the 10K measurement was way off. Something was wrong! He found that the value was increasing ... It was self-heating ! We indeed were using the 4W high-power mode and the resistor was getting hot.
We changed settings to 4W Resistor LOW power mode, and waited some minutes. Now, this time the SL935 10K measurement agreed to 1ppm. It was spot on.
What are the applied currents/voltages in the high and low power modes?
Hope is not all lost. At least it works in most conditions and I can use it as a 'transfer standard' for the usual ranges.
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First question I would ask, what is accuracy column exactly mean? :) Voltage 10V point at 0.2ppm? 10kOhm at 0.5ppm? Those are not even 24 hour specs, so :-//?
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Out of curiosity, what do you do with your temperature measurements?These temperature measurements simply accompany long-term drift measurements :)
I spoke with the TRANSCAT representatives today. Looks like they recognize that they made critical errors with their tolerances and some units. They have at least acknowledged them for now...
I spoke with the TRANSCAT representatives today. Looks like they recognize that they made critical errors with their tolerances and some units. They have at least acknowledged them for now...
Forgive my obtusity, but what error have they made? In the three relevant ranges, the only thing that raised an eyebrow for me was the TUR on the 10M range.
If I did the math correctly (assuming LOW Power, TCR, and EXT CAL):
This is not the same as what TRANSCAT provided (assuming HI Power only):
TRANSCAT will not reveal the following:
- power (HI/LO) level, which dictates the tolerances
- integration time
The CAL steps at these modes are tests, if the performance is acutally within the bounds. AFAIK there is no individual adjustment, just 10 V and 10 K.
I just got off the phone with the calibration technician. He said that he tried everything to make the R6581T measure within tolerance:
- 2-wire mode instead of 4-wire for the 10 MΩ, 100 MΩ, and 1 GΩ range (they will update the accreditation data to reflect this)
- checked both HI and LO power settings (not much difference)
- used 100 PLC for the whole procedure
- OMH-COMP OFF
Apparently, the technician had no problem with the R6581T because it is similar to the Fluke 3458 and 8508.
He mentioned that while testing, he noticed something very strange about the -1 V reading on the 10 V range. He had to calibrate the DMM three to four times to get the instrument to read correctly. This might be key to diagnosing the problem... EDIT: This sounds like ACAL R230, which is located right next to R234.
I think I must have done something wrong on my end. Maybe I overheated a component while de/soldering or left part of the board contaminated enough to have poor readings at the high-resistance range. :(
EDIT: Change history:
1) Branadic binding post adapter with leads soldered to posts
2) R200 - easy replacement with solder sucker because the feet were straight
3) R234 - particularly difficult to remove with a soldering iron, solder sucker, and eventually wire cutters
4) K006 - followed the picture and heat shank a cover over the green wire
5) C215 - easy to overheat, but should not be a critical component
I am going to get an estimate for the cost of repair if possible. Might as well have the instrument come out completely calibrated.
Getting trouble with -1 V in the 10 V range is a really bad sign, as this point is also used in the ACAL procedure.
Is the fix for the relay power saving bug applied ?
I received my Advantest R6581T back from Transcat today. Sure enough, it has the problem with the high ohms range. They are not willing to diagnose or repair it. :horse:
When I measure an Ohmite RX-1M 1 GΩ 1 % resistor, the reading is within tolerance initially.
After observing the meter readings for about 2 hours, I believe the measurements decay over time until a steady-state value is reached.
My guess is that the instrument reads correctly for a while but slowly drifts off course. The same values appear for both the front and rear terminals. I am going to take some time to measure all my resistance/voltage standards before opening it up for diagnostics.
Does anyone know how to explain this mechanism?
Has anyone successfully measured high-resistances with their Advantest R6581?
The input bias might well be very time dependent, e.g. for a HP3456A I've seen spikes in the nA range for an input bias current averaging less than 100pA. A digital picoammeter might not the best tool to catch that.I received my Advantest R6581T back from Transcat today. Sure enough, it has the problem with the high ohms range. They are not willing to diagnose or repair it. :horse:
When I measure an Ohmite RX-1M 1 GΩ 1 % resistor, the reading is within tolerance initially.
After observing the meter readings for about 2 hours, I believe the measurements decay over time until a steady-state value is reached.
My guess is that the instrument reads correctly for a while but slowly drifts off course. The same values appear for both the front and rear terminals. I am going to take some time to measure all my resistance/voltage standards before opening it up for diagnostics.
Does anyone know how to explain this mechanism?
Can you measure the input bias current, preferably directly with a picoammeter, on the DCV range that would correspond to the voltage used in the 1G resistance mode? If no picoammeter is available, just shunt the input with a stable 1M resistor and a small (1-10nF) mylar or PP capacitor--each microvolt displayed corresponds to 1 pA bias current. Start with the meter cold and see what the bias current does over a 4 hour period.
The input bias might well be very time dependent, e.g. for a HP3456A I've seen spikes in the nA range for an input bias current averaging less than 100pA. A digital picoammeter might not the best tool to catch that.
Can you measure the input bias current, preferably directly with a picoammeter, on the DCV range that would correspond to the voltage used in the 1G resistance mode?
Has anyone successfully measured high-resistances with their Advantest R6581?
My R6581T is out of spec on 10M and above.
martinr33 pointed out a very interesting observation today:
The Advantest R6581 is rated to a maximum of 1000 V, whereas the R6581T model is rated to 300 V in my variation.
TiN's model is rated to 120 V! https://xdevs.com/doc/Advantest/R6581T/img/adv_front.jpg (https://xdevs.com/doc/Advantest/R6581T/img/adv_front.jpg)
According to the dataset that was provided, the calibration lab tested my unit to 1000 V... :scared:
I received my Advantest R6581T back from Transcat today. Sure enough, it has the problem with the high ohms range. They are not willing to diagnose or repair it. :horse:
When I measure an Ohmite RX-1M 1 GΩ 1 % resistor, the reading is within tolerance initially.
After observing the meter readings for about 2 hours, I believe the measurements decay over time until a steady-state value is reached.
My guess is that the instrument reads correctly for a while but slowly drifts off course. The same values appear for both the front and rear terminals. I am going to take some time to measure all my resistance/voltage standards before opening it up for diagnostics.
Does anyone know how to explain this mechanism?
Can you measure the input bias current, preferably directly with a picoammeter, on the DCV range that would correspond to the voltage used in the 1G resistance mode? If no picoammeter is available, just shunt the input with a stable 1M resistor and a small (1-10nF) mylar or PP capacitor--each microvolt displayed corresponds to 1 pA bias current. Start with the meter cold and see what the bias current does over a 4 hour period.
Even the time with auto zero on look still quite good. The mean near zero is a slight surprize. AFAIK there is no adjustment pot to the bias current so I would consider this a lucky coincidence.
However the point with zero input voltage is also the easy case, as this means switching between 2 essentially equal voltages . Chances are the spikes get larger when there is an input voltage, like some -5 V.
The zero of the amp meter should normally be done with an open input. I don't think this would make a large difference, as there may be relays off at the input, when the meter is off.
The test of the input current is not so much about accuracy, more about the rough size. So no calibration for the meter would not be a problem.
The firmware version states: ".A01". Is there a newer version available?
The -19 V reference voltage check was missing. The offset numbers in diagnostic mode mean that the precision channel of the input amplifier produces a constant output offset of about 3 V. Depending on gain this output offset gets attributed the numbers shown in diagnostics. It can be a problem of that amplifier or of the -19 V reference. Better fix this before playing with firmware update.
Regards, Dieter
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The expected voltages at R200 would be similar to R201.
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One possible fault to cause an offset may be a non-working reset at the ADC integrator. So maybe check TP201 with the scope. Probably best with 1 PLC, non-AZ and a short in the 10 V range.
Here's 03.
Have you successfully used these files?
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I tried to look at the diagnostic mode measurements and check the results with another DVM. Very confusing, e.g. they display the 7.2 reference voltage as 0.706221, while the HP 3478A displays 7.0640. The diagnostic measurements may be in arbitrary units.
Regards, Dieter
https://cloud.mail.ru/public/xwNi/b5vD62nsc
Internal check data of my multimeter. For comparison.
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This multimeter has had a difficult life. I had to align the case, and wash, and clean the buttons ...
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With covers open I nulled the instrument with a low thermal short and then connected 10 MOhm with 1 uF MKS parallel to the voltage input. So 1 pA of leakage generates 10 uV offset voltage. I added a protective box over the input terminals with the resistor and the cap to suppress air drafts.
The steady-state observation was 3 uV, that is 0.3 pA leakage.
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There are absolutely no problems with the input current at zero voltage at the input. But far from zero, it becomes catastrophic due to charge injection during multiplexing.
Input current, calculated from R6581T voltage readings:
I suppose there is a possibility that I installed the R230 and R234 backwards, but I was careful to check the other people's reference pictures before installation.
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Added the additional data to the table.
For whatever reason the values of your unit are odd, leighcorrigall. I would try to find out why.
-branadic-
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Are the wrong readings at least changing to the degree of normal noise, when a new measurement/update is called for?
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Are the wrong readings at least changing to the degree of normal noise, when a new measurement/update is called for?
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The values are fairly stable. These measurements were taken now:
X1ZERO_1 = -0.0167 DCV
X1ZERO_2 = +2.9543 DCV
X10ZERO = +0.29526 DCV
X100ZERO = +0.0294 DCV
7.2Vref = +10.04475 DCV
-10Vref = -6.89803 DCV
-1Vref = -0.68989 DCV
-0.1Vref = -0.069098 DCV
INT_TEMP = +70.3 °C
I suppose there is a possibility that I installed the R230 and R234 backwards, but I was careful to check the other people's reference pictures before installation.Tonight, I will check the voltages.
EDIT: Couldn't wait!
R230: 98.5 mV, 0.985 V, 9.85 V
R234: 9.659 V, 7.090 V (across the network: 16.75 V)
...
X1ZERO_1 = -16.668 mVDC
X1ZERO_2 = +0.2954 mVDC
X10ZERO = +0.0295 mVDC
X100ZERO = +29.519 mVDC
7.2Vref = +1.0044 mVDC
-10Vref = -0.6897 mVDC
-1Vref = -0.0689 mVDC
-0.1Vref = -69.01 mVDC
INT_TEMP = +64.05 °C
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C026 slows down some of the switches. ...If you look at the schematic again, the patch slows down E_DCV only. Out of curiosity i removed the patch replacing R083 by a short. Now even with Autozero on the positive side looks clean. What a mess.
I think the MCU U300 outputs all necessary signals to replace U001 and U012 to U017 by 2x MAX308 without any glue logic.I don't quite understand why you try to replace a good hybrid MUX with a general purpose MAX308 with huge leakage current.
The MUX308 isn't general purpose, but especially designed for this application "metering front end". From it's datasheet i read that it's leakage starts at 1 pA at room temperature...No, it's one of the average performance MUX. MAXIM has another series of low leakage multiplexers: 326/327/328. I widely used them in impedance synthesizer, voltmeter - voltage calibrator, etc. The main problem is to minimize their parasitic thermoEMF.
MPX 20 MΩ (https://www.eevblog.com/forum/metrology/mpx(mrh)-resistors/msg3544454/ (https://www.eevblog.com/forum/metrology/mpx(mrh)-resistors/msg3544454/))
100M range: 2.0000770 MΩ (internal temperature: 42.5 °C)
1000M range: 2.0042533 MΩ (internal temperature: 42.5 °C)
The link tests a resistor in this series and shows a temperature coefficient of 600ppm/°C
https://ampnuts.com/everybody-lies/
The link tests a resistor in this series and shows a temperature coefficient of 600ppm/°C
https://ampnuts.com/everybody-lies/ (https://ampnuts.com/everybody-lies/)
That is unfortunate. I was hoping to use RX-1M's as a performance indicator.
Here's 03.
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Concerning the offsets observed by leighcorrigall: The x1zero_2 offset is large, about 3 V. For me the fact that x1zero_1 is small and x1zero_2 is large indicates that the problem should not be in the ADC. So i would check again around U100, where it selects one of the two preamplifier channels. I would do it in diagnostic mode. Hook a meter to the ADC input (e.g. one end of R150) and measure the change when switching between x1zero_1 and x1zero_2. I remember you tried something like that before, but you have to repeat it. It happens to all of us.
To be honest another possible cause may be a bad U214. That MUX configures the ADC for fast and precision modes. ADC configuration also depends on U100/4. I would try and use a scope to find out which one is bad. Optical inspection first, maybe some solder where it should not be.
...
Regards, Dieter
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Maybe the slope amplifier U207 has a problem that shows up only in precision mode. In fast mode that amplifier runs without gain (G ~ 1 as determined by R219 and R137). When I measure TP202 in diagnostic mode with x1Zero_1 I get -0.02 V, with x1Zero_2 it is -0.37 V. In DCV mode with shorted inputs, I got:
-3.2 mV at 10 usec,
-35 mV at 200 usec,
-0.18 mV at 2 msec and
-0.37 V at 10 PLC integration time.
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As the comparator threshold is at 0.15 V, the 1.490 V appears to be off the scale. Notably, it is almost exactly half the offset you are looking for.
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... short across U214/1 (pins 2 to 3) while in x1Zero_2 diagnostic mode and see whether the offset vanishes. This is a better test of whether U214/1 works as intended. One can do it with a screwdriver or probe tip.
Also one should check substrate voltage -3.3 V at the output of U204/2, net "B".
Next, I would check the control signals of the lower current sources, "Rundown sources". If one of them is stuck (always on), that will certainly affect long integration time during precision mode much more than short integration times in fast mode.
The comparator threshold is at pin 3 of U308 (the comparator).
It may be worth checking the supply of the comparator too. I faintly remember that some boards had a problem with filter caps in that area that sometimes is installed with the wrong polarity.
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Chances are the voltage at TP202 may change quite a bit when applying a voltage to the input of some +-100 mV or so, but not much further change at +-1 V.
Apologies, but I am uncertain if I am interpreting your suggestion correctly. This is what I tried, Kleinstein.The comparator threshold is at pin 3 of U308 (the comparator).
It may be worth checking the supply of the comparator too. I faintly remember that some boards had a problem with filter caps in that area that sometimes is installed with the wrong polarity.
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U308 is a HC164 manufactured by Texas Instruments https://www.ti.com/lit/ds/symlink/sn74hc164.pdf?ts=1636338788446 (https://www.ti.com/lit/ds/symlink/sn74hc164.pdf?ts=1636338788446). I do not know where it is located in MickleT's schematics. The IC is located near J300, which is close to the shielded transformer.
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Sorry for the confusion - U208 is the comparator :palm:.
For the 1 µs case, the ADC is likely most of the time in the analog Zero phases (U213/1 closed) and for this a voltage near zero is correct. So I would see the zero reading there as a good sign.
The 200 µs case could be just a mixture of zero phase and actual run-up. So hard to make anything from that reading.
The change in DC voltage at TP202 is smaller than I thought, but one can see that the 0 point is still more like the positive voltages. There is some jump between the 0 and -100 mV points. This is kind of normal. Depending on the offsets the jump can be also just at the other side of zero.
As far as I remember this jump should be at the point where the reference on/of ratio during run-up is 50:50. So from this point, the ADC seems to work correctly and should not show a large offset. This makes me suspect that it could be a kind of software thing with some offset constant included. This may mean that the fast amplifier could be actually the one that is off. I don't know if this was already tested: is the amplifier output in the fast mode actually near-zero with the input shorted?
I don't expect it to be off by much, but is the output of U504 (OP07 as GND buffer for the gain divider) actually near zero. A significant offset there could also cause unusual cal constants.
... U208 is the comparator ...
...
set the integration time to1 μs200 μs at the 10 V range.
...
...
-0.18 mV at 2 msec and
...
...
-0.165 V @ 2 ms (inconsistent with your measurement)
...
...
Next, I would check the control signals of the lower current sources, "Rundown sources". If one of them is stuck (always on), that will certainly affect long integration time during precision mode much more than short integration times in fast mode.
...
Is there an easy approach for testing the rundown sources?Yes, there is. DIAG MODE -> A/D CHECK.
Checking the rundown sources with a multimeter: One could try and measure the nets denoted as +S64 +S4 -S1 -S16 and -S256. They are R213 pins as well, except -S256. -S256 is accessible at the source of Q206. The MOSFETs drive the current sources either into the integrator input or into ground. All five voltages should be near zero with -S256 the largest.
With DCV, 10 V, 10 PLC and input short I get: +S64 = 5.6 mV, +S4 = 0.1 mV, -S1 = - 0.1 mV, -S16 = -1.7 mV, -S256 = -24.3 mV.
...
The exact numbers depend on the ADC result and may vary a little. So they agree. I measured +S4 once more, using R213 Pin 7 as precision Gnd and this time I have 0.35 mV.
...
...
By the way, when I measure +S1024 at the drain of Q201 I am getting 96 mV, while Sx at the drain of Q200 is -49 mV. A factor of two is expected, since the positive source steers 1.5 mA, while the negative one steers 0.75 mA (again DCV, 10V range, 10 PLC, inputs shorted). In this sense, one can expect +S4 to be 4x more than -S1.
...
...
In this sense, one can expect +S4 to be 4x more than -S1.
...
...
I think, in order to discover the origin of your "stealth offset", you should find a friend with a scope. More subtle errors like integrator input leakage or MOSFET switch leakage won't reveal with a multimeter.
Regards, Dieter
I just got 16.66 V at the output of U209. U211 outputs 18.61 V and U210 outputs -9.80 V. Reference voltage is 7.05 V. The LTZ1000 heater gets 9.55 V (emitter of Q1 after about 5 minutes of heating). What else?
...
By the way i added 100 nF film capacitors to the reference processing stages.Without comparative measurements, it looks more like a placebo.
...
Concerning integrator offset current: During integrator reset it will flow through R236. In 10 PLC measurement integrator reset is active for 7 msec. So the test is only 7 msec / 207 msec sensitive. Yet, to produce an offset of 3 V the offset current
would have to be about 0.75 mA * 3 V / 10 V = 0.225 mA, so one would expect 7 mV over R236. It's a test of Q211, U213/1, U205 and U206 that one can do with a multimeter. When I look there with an HP 3478A it shows 2 or 3 uV, likely all thermal EMF.
Regards, Dieter
Hmmm... Moving onto MickleT's constant current sink schematic.
I am measuring -9.61 between GND4 and TP400 (VS), which I think should be -22 V.
The last two isn't a problem but only typos while converting to CAD schematics.
Instead of U107 must be U400, and U403 (pin 5) = -14.9 V is Ok too.
From the measurend voltages the transistor is working OK. The question is, why U400 only gives some 10.1 V.
Could it be U401/2 and U401/3 switched wrong for some odd reason.
In the schematis (V5), there seems so be a few more minor mistake with the supply to U410 and likely also U401, U402. Very likely V+ goes to +5 V and GND to GND of some type.
The voltage noted for pins 20 and 21 of R400 are not compatible with the resistor values given.
The naming for the U406-Q0 and Q1 signal as x1 and x2 is also odd, as the unused range with Q1 active would be more like 1/3 the currents.
...
x1Zero_1 = -0.0167 VDC (10 V range)
x1Zero_2 = +2.9543 VDC (10 V range)
x10Zero = +295.254 mVDC (1000 mV range)
x100Zero = +29.435 mVDC (100 mV range)
7.2Vref = +10.04475 VDC (10 V range), actual: +7.07 V
-10Vref = -6.88804 (10 V range), actual: -9.83 V
-1Vref = -689.901 mVDC (1000 mV range), actual: -0.984 V
-0.1Vref = -69.106 mVDC (100 mV range), actual: -0.098 V
Int_temp = +70.5 °C, actual temperature is much less than this value
10mA = -6.909 mADC (10 mA range)
1000uA = -690.64 uADC (1000 uA range)
100uA = -69.082 uADC (100 uA range)
10uA = -6.905 uADC (10 uA range)
1000nA = +1967.28 nADC (1000 nA range)
100nA = +196.73 nADC (100 nA)
10nA = +285.41 nADC (100 nA)
...
Cumulative Measurements R6581do you have raw data?
Cumulative Measurements R6581do you have raw data?
All those resistors are driving zeners. If the input is unregulated supply voltage, it does look like damage from overvoltage. Anyway overvoltage is a possible explanation for multiple failure.
Regards, Dieter
I suppose there is a possibility that I installed the R234 backwards, but I was careful to check the other people's reference pictures before installation.Tonight, I will check the voltages.
EDIT: Couldn't wait!
R230: 98.5 mV, 0.985 V, 9.85 V
R234: 9.659 V, 7.090 V (across the network: 16.75 V)
So far, the voltage magnitudes appear to be reasonable to me. :-//
The firmware version states: ".A01". Is there a newer version available?
Diagnostic summary table R6581, R6581D, R6581T
(https://img.radiokot.ru/files/98285/thumbnail/2pzy08s4zt.jpg) (https://img.radiokot.ru/files/98285/2pzy08s4zt.jpg)
...
I think I have asked this before: did the meter read +10 V and +11 V OK (not saturating early - so not about a few ppm off, but more like 100 mV or more) ? If there is really this 3 V offset also there, this would drive the ADC in saturation and should cause an early saturation at the upper end.
A point to check may be of for some reason the amplifier sometimes oscillates during the self-tests. So maybe monitor the voltage at the ADC in test point during the diagnostic mode.
...
For HW diagnostic one would really need a scope - it is hard enough with a scope, but nearly hopeless without.
...
4) Not very repeatable in the calibration (repeated adjustment gives different results, or did they fudge in some extra shifts in the pos and neg ref readings to find some compromise the work at the cal points ? )
...
Here's a pic of my older R6581 (grey label). Indications are that it is late 1998. This unit has no serial number, grey rear labels and what I suspect to be an older style fan logo (italicized Pico Ace 25 logo).
(Attachment Link)
I could not find MickleT's excellent report on 6581 variants, but I noted that this unit has metal can resistors on the voltage reference board - no plastic.
Shematics R6581 v.5
Hmm,
D113 looks like being cracked.
regards Andreas
D110 looks much better.
Also, D112 does not look very good.
D113 is either very dirty or half of the part is missing.
...
100 Samples at 100 PLC would be something like frequencies from 3 to 300 mHz.
A more comparable test would be 100 samples at 1 PLC and thus more like 0.3 to 30 Hz. Maybe take 300 readings and average 3 to get even closer to the standard 0.1 to 10 Hz band.
...
Another point may be the trimmer setting and temperature drift of the amplifier. If the trimmer is set wrong the amplifier could have higher temperature sensitivity and temperature fluctuation look a lot like 1/f noise.
The trimmer effects both the offset and temperature drift. The important part here is the drift. The offset is corrected digitally anyway and is more like a way to "measure" the trimmer position to help with the TC adjustment.
...
For what conditions are the noise measurements ?
...
I just got off the phone with the calibration technician. He said that he tried everything to make the R6581T measure within tolerance:
- 2-wire mode instead of 4-wire for the 10 MΩ, 100 MΩ, and 1 GΩ range (they will update the accreditation data to reflect this)
- checked both HI and LO power settings (not much difference)
- used 100 PLC for the whole procedure
- OMH-COMP OFF
Apparently, the technician had no problem with the R6581T because it is similar to the Fluke 3458 and 8508.
He mentioned that while testing, he noticed something very strange about the -1 V reading on the 10 V range. He had to calibrate the DMM three to four times to get the instrument to read correctly. This might be key to diagnosing the problem... EDIT: This sounds like ACAL R230, which is located right next to R234.
Interestingly, I just ran a reverse polarity test on the R6581T between 100 mV and 10 V ranges using a Fluke 732A. It appears that the polarity error is not exclusive to the 10 V range when measuring ±1 V. The error follows a power-law relationship with the input. Benchmark settings are the same as previously mentioned.
...
There still exists a baseline noise that is consistent on 100 mV, 1000 mV and 10 V ranges after replacing U100, U101, U105 and all of the electrolytes.
...
It does not make much sense to look at the turnover error in the non-AZ mode. If so one would need a repeated offset measurement. This would likely mean polarity reversal with switches (or even latching relays) and several repeats with offset readings in the cycle. The non-AZ mode is just not well suited for small DC voltages.
...
...
It does not make much sense to look at the turnover error in the non-AZ mode. If so one would need a repeated offset measurement. This would likely mean polarity reversal with switches (or even latching relays) and several repeats with offset readings in the cycle. The non-AZ mode is just not well suited for small DC voltages.
...
Good idea. I will try with AZERO mode ON soon :)
R240 is 10 Ohm.
ADVANTEST,R6581 ,0,A02 ADVANTEST,R6581D,0,A02
6581.DAT R6581.PNL R6581.DAT
R6581
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
"VOLT:DC" "VOLT:AC" "CURR:DC" "CURR:AC" "RES" "FRES" "FREQ" "PER"
+1.00E-01 +1.00E+00 +1.00E+01 +1.00E+02 +1.00E+03
+1.00E-02 +1.00E-01 +1.00E+00 +1.00E+01 +1.00E+02 +7.50E+02
+1.00E-07 +1.00E-06 +1.00E-05 +1.00E-04 +1.00E-03 +1.00E-02 +1.00E-01 +1.00E+00
+1.00E-04 +1.00E-03 +1.00E-02 +1.00E-01 +1.00E+00 +1.00E+01 +1.00E+02 +1.00E+03 +1.00E+04 +1.00E+05 +1.00E+06 +1.00E+07 +1.00E+08 +1.00E+09
3.00 4.00 5.00 6.00 7.00 8.00
+1.00000E-06 +2.00000E-06 +3.00000E-06 +4.00000E-06 +5.00000E-06 +6.00000E-06 +7.00000E-06 +8.00000E-06 +9.00000E-06
+1.00000E-05 +2.00000E-05 +3.00000E-05 +4.00000E-05 +5.00000E-05 +6.00000E-05 +7.00000E-05 +8.00000E-05 +9.00000E-05
+1.00000E-04 +2.00000E-04 +3.00000E-04 +4.00000E-04 +5.00000E-04 +6.00000E-04 +7.00000E-04 +8.00000E-04 +9.00000E-04
+1.00000E-03 +2.00000E-03 +3.00000E-03 +4.00000E-03 +5.00000E-03 +6.00000E-03 +7.00000E-03 +8.00000E-03 +9.00000E-03
+1.00000E-02 +2.00000E-02 +4.00000E-02 +6.00000E-02 +8.00000E-02
+1.00000E-01 +1.20000E-01 +1.40000E-01 +1.60000E-01 +1.80000E-01 +2.00000E-01 +4.00000E-01 +6.00000E-01 +8.00000E-01
+1.00000E+00 +1.20000E+00 +1.40000E+00 +1.60000E+00 +1.80000E+00 +2.00000E+00 +1.00000E-04 +1.00000E-03 +1.00000E-02
+1.00000E-01 +1.00000E+00 +1.00000E-06 +2.00000E-06 +3.00000E-06 +4.00000E-06 +5.00000E-06 +6.00000E-06 +7.00000E-06 +8.00000E-06 +9.00000E-06
+1.00000E-05 +2.00000E-05 +3.00000E-05 +4.00000E-05 +5.00000E-05 +6.00000E-05 +7.00000E-05 +8.00000E-05 +9.00000E-05
+1.00000E-04 +2.00000E-04 +3.00000E-04 +4.00000E-04 +5.00000E-04 +6.00000E-04 +7.00000E-04 +8.00000E-04 +9.00000E-04
+1.00000E-03 +2.00000E-03 +3.00000E-03 +4.00000E-03 +5.00000E-03 +6.00000E-03 +7.00000E-03 +8.00000E-03 +9.00000E-03
+1.00000E-02 +1.66666E-02 +3.33333E-02 +5.00000E-02 +6.66666E-02 +8.33333E-02
+1.00000E-01 +1.16666E-01 +1.33333E-01 +1.50000E-01 +1.66666E-01 +3.33333E-01 +5.00000E-01 +6.66666E-01 +8.33333E-01
+1.00000E+00 +1.16666E+00 +1.33333E+00 +1.50000E+00 +1.66666E+00 +1.00000E-04 +1.00000E-03 +1.00000E-02 +1.00000E-01
+1.00000E+00 +5.00000E-05 +1.00000E-04 +1.50000E-04 +2.00000E-04 +2.50000E-04 +3.00000E-04 +3.50000E-04 +4.00000E-04 +4.50000E-04 +5.00000E-04
+1.00000E-03 +1.50000E-03 +2.00000E-03 +2.50000E-03 +3.00000E-03 +3.50000E-03 +4.00000E-03 +4.50000E-03 +5.00000E-03
+1.00000E-02 +1.50000E-02 +2.00000E-02 +2.50000E-02 +3.00000E-02 +3.50000E-02 +4.00000E-02 +4.50000E-02 +5.00000E-02
+1.00000E-01 +1.50000E-01 +2.00000E-01 +2.50000E-01 +3.00000E-01 +3.50000E-01 +4.00000E-01 +4.50000E-01 +5.00000E-01
+1.00000E+00 +2.00000E+00 +3.00000E+00 +4.00000E+00 +5.00000E+00 +6.00000E+00 +7.00000E+00 +8.00000E+00 +9.00000E+00
+1.00000E+01 +2.00000E+01 +3.00000E+01 +4.00000E+01 +5.00000E+01 +6.00000E+01 +7.00000E+01 +8.00000E+01 +9.00000E+01
+1.00000E+02 +6.00000E-05 +1.20000E-04 +1.80000E-04 +2.40000E-04 +3.00000E-04 +3.60000E-04 +4.20000E-04 +4.80000E-04
+5.40000E-04 +6.00000E-04 +1.20000E-03 +1.80000E-03 +2.40000E-03 +3.00000E-03 +3.60000E-03 +4.20000E-03 +4.80000E-03
+5.40000E-03 +6.00000E-03 +1.20000E-02 +1.80000E-02 +2.40000E-02 +3.00000E-02 +3.60000E-02 +4.20000E-02 +4.80000E-02
+5.40000E-02 +6.00000E-02 +1.20000E-01 +1.80000E-01 +2.40000E-01 +3.00000E-01 +3.60000E-01 +4.20000E-01 +4.80000E-01
+5.40000E-01 +6.00000E-01 +1.00000E+00 +2.00000E+00 +3.00000E+00 +4.00000E+00 +5.00000E+00 +6.00000E+00 +7.00000E+00
+8.00000E+00 +9.00000E+00 +1.00000E+01 +2.00000E+01 +3.00000E+01 +4.00000E+01 +5.00000E+01 +6.00000E+01 +7.00000E+01
+8.00000E+01 +9.00000E+01 +1.00000E+02
+2.00000E-05
+3.00000E-05
+4.00000E-05 +5.00000E-05 +6.00000E-05 +7.00000E-05 +8.00000E-05 +9.00000E-05 +1.00000E-04
+2.00000E-04 +3.00000E-04 +4.00000E-04 +5.00000E-04 +6.00000E-04 +7.00000E-04 +8.00000E-04 +9.00000E-04
+1.00000E-03 +2.00000E-03 +3.00000E-03 +4.00000E-03 +5.00000E-03 +6.00000E-03 +7.00000E-03 +8.00000E-03
AC DC FAST MID SLOW FREQ PER OCOM CHEC VOLT CURR
-500 500 0 LOW HI IMM MAN EXT BUS LEV TLIN LINE TIM
+0.00000000E+00 +9.99999999E+05 +0.00000000E+00
+1.00000000E-03 +9.99999999E+05 +1.00000000E+00
+1.00000E+00 +1.00000E+05 +1.00000E+00 +9.90000E+37
MEM GPIB
-120 120 0 NEG POS INT16 INT32 NONE SMO AVER MEDI
2 100 10 NONE SCAL DEV DELT DB RMS DBM OTEM RTD
-9.99999999E+17 +9.99999999E+17 +1.00000000E+00
-9.99999999E+17 +9.99999999E+17 +1.00000000E+00
2 10000 10
+1.00000000E-17 +9.99999999E+17 +1.00000000E+00
-9.99999999E+17 +9.99999999E+17 +1.00000000E+00
-9.99999999E+17 +9.99999999E+17 +0.00000000E+00
-9.99999999E+17 +9.99999999E+17 +1.00000000E+00
-1.000E+02 +1.000E+02 +2.000E+01
+1.00000000E-17 +9.99999999E+17 +1.00000000E+00
IPTS ITS C F K
-9.99999999E+51 +9.99999999E+51 +0.00000000E+00
OFF FAIL PASS
2 10000 10
+9.00000000E+00 +1.10000000E+01 +1.00000000E+01
+9.00000000E+03 +1.10000000E+04 +1.00000000E+04
0 46 0 0 46 46 d ’ d d ’ ’ 100 146 100 100 146 146
203 200 200 203 203
300 303 300 300 303 303
400 406 400 400 406 406
500 518 500 500 518 518
600 662 600 600 662 662
0 25 0 0 25 25
0 29 0 0 29 29
1 10 1 1 10 5 1 5 1 1 5 5
FULL PRET
1
10000
1000
-9999
9999
0
-9999
9999
999
MAN EXT BUS
1
100000
1000
0
99999
0
0
99999
999
ASC REAL64 NONE HEAD SHE LIM 4WCH CHAN NULL DFIL FORM TIME FLO LOW FRON REAR 50Hz 60Hz COMM SPAC CRLF CRLF LF EOI LFEO
ANALOG OUTPUT
PRINTER
BCD OUTPUT
SCANNER
SCANNER
"No error" -100,"Command error" -101,"Invalid character" -102,"Syntax error" -103,"Invalid separator" -104,"Data type error" -105,"Get not allowed" -108,
"Parameter not allowed" -109,"Missing parameter" -110,"Command header error" -111,"Header separator error" -112,"Program mnemonic too long" -113,
"Undefined header" -114,"Header suffix out of range" -120,"Numeric data error" -121,"Invalid character in number" -123,"Exponent too large" -124,
"Too many digits" -128,"Numeric data not allowed" -131,"Invalid suffix" -140,"Character data error" -141,"Invalid character data" -144,"Character data too long" -148,
"Character data not allowed" -150,"String data error" -151,"Invalid string data" -154,"String data too long" -158,"String data not allowed" -160,"Block data error" -161,
"Invalid block data" -168,"Block data not allowed" -170,"Expression error" -171,"Invalid expression" -178,"Expression data not allowed" -200,"Execution error" -201,
"Invalid while in local" -202,"Setting lost due to rtl" -210,"Trigger error" -211,"Trigger ignored" -212,"Arm ignored" -213,"Init ignored" -214,"Trigger deadlock" -215,
"Arm deadlock" -211,"Trigger ignored(IDLE)" -211,"Trigger ignored(at Arm Layer)" -211,"Trigger ignored(at Arm Layer2)" -211,"Trigger ignored(at Trigger Layer)" -212,
"Arm ignored(IDLE)" -212,"Arm ignored(at Arm Layer)" -212,"Arm ignored(at Arm Layer2)" -212,"Arm ignored(at Trigger Layer)" -213,"Init ignored(IDLE)" -213,
"Init ignored(at Arm Layer)" -213,"Init ignored(at Arm Layer2)" -213,"Init ignored(at Trigger Layer)" -220,"Parameter error" -221,"Setting Conflict" -222,
"Data out of range" -223,"Too much data" -224,"Illegal parameter value" -224,"Illegal parameter value (lower limit>upper limit)" -230,"Data corrupt or stale" -241,
"Hardware missing" -252,"Missing media" -253,"Corrupt media" -254,"Media full" -255,"Directory full" -256,"File name not found" -257,"File name error" -258,
"Media protected" -260,"Expression error" -261,"Math error in expression" -311,"Memory error" -313,"Calibration memory lost" -314,"Save/recall memory lost" -315,
"Configuration memory lost" -330,"Self-test failed" -350,"Queue overflow" -410,"Query INTERRUPTED" -420,"Query UNTERMINATED" -430,"Query DEADLOCKED" -440,
"Query UNTERMINATED after indefinite response" +100,"Cannot execute in this function" +101,"Cannot execute in FAST mode" +102,"Cannot execute while storing" +102,
"Cannot execute while storing (FAST mode)" +103,"Cannot execute in the ALARM" +104,"Cannot execute in setting hardware" +105,"Cannot execute in this DMM" +110,
"Query data nothing" +111,"Invalid ASCII data" +112,"No recall data" +113,"End of file" +120,"Key buffer overflow" +121,"Input Queue overflow" +130,
"Math error (Duplicate execution)" +131,"Math data error" +140,"Bad battery of memorycard" +200,"Interface error (Accessory)" +201,"Accessory error" +210,
"Communication error (Analog)" +211,"Communication error" +220,"A/D check1 error" +221,"A/D check2 error" +222,"A/D check3 error" +223,"A/D check4 error" +224,
"A/D check5 error" +230,"Internal zero error" +240,"Internal Reference1 error" +250,"Internal Reference2 error" +251,"Internal Reference2 error" +252,
"Internal Reference2 error" +253,"Internal Reference2 error" +254,"Internal Reference2 error" +255,"Internal Reference2 error" +260,"Internal Reference3 error" +261,
"Internal Reference3 error" +262,"Internal Reference3 error" +263,"Internal Reference3 error" +264,"Internal Reference3 error" +265,"Internal Reference3 error" +266,
"Internal Reference3 error" +267,"Internal Reference3 error" +268,"Internal Reference3 error" +269,"Internal Reference3 error" +270,"Internal Reference3 error" +271,
"Internal Reference3 error" +272,"Internal Reference3 error" +273,"Internal Reference3 error" +274,"Internal Reference3 error" +275,"Internal Reference3 error" +276,
"Internal Temperature error" +280,"Level Trigger error" +281,"Level Trigger error" +282,"Level Trigger error" +283,"Level Trigger error" +290,
"Communication error (from panel to main)" +293,"D.P.RAM Read/Write error (Main)" +300,"Internal AC error" +301,"Internal AC error" +302,"Internal AC error" +303,
"Internal AC error" +304,"Internal AC error" +305,"Internal AC error" +306,"Internal AC error" +307,"Internal AC error" +308,"Internal AC error" +309,
"Internal AC error" +310,"Internal AC error" +311,"Internal AC error" +312,"Internal AC error" +313,"Internal AC error" +314,"Internal AC error" +315,
"Internal AC error" +316,"Internal AC error" +317,"Internal AC error" +318,"Internal AC error" +319,"Internal AC error" +320,"Internal AC error" +321,
"Internal AC error" +322,"Internal AC error" +323,"Internal AC error" +400,"A/D error" +410,"FAN error" +510,"Cannot execute External Calibration" +500,
"External Calibration Error No.0" +500,"External Calibration Error No.1" +500,"External Calibration Error No.2" +500,"External Calibration Error No.3" +500,
"External Calibration Error No.4" +500,"External Calibration Error No.5" +500,"External Calibration Error No.6" +500,"External Calibration Error No.7" +500,
"External Calibration Error No.8" +500,"External Calibration Error No.9" +500,"External Calibration Error No.10" +500,"External Calibration Error No.11" +500,
"External Calibration Error No.12" +500,"External Calibration Error No.13" +500,"External Calibration Error No.14" +500,"External Calibration Error No.15" +500,
"External Calibration Error No.16" +500,"External Calibration Error No.17" +500,"External Calibration Error No.18" +500,"External Calibration Error No.19" +500,
"External Calibration Error No.20" +500,"External Calibration Error No.21" +500,"External Calibration Error No.22" +500,"External Calibration Error No.23" +500,
"External Calibration Error No.24" +500,"External Calibration Error No.25" +500,"External Calibration Error No.26" +500,"External Calibration Error No.27" +500,
"External Calibration Error No.28" +500,"External Calibration Error No.29" +500,"External Calibration Error No.30" +500,"External Calibration Error No.31" +500,
"External Calibration Error No.32" +500,"External Calibration Error No.33" +500,"External Calibration Error No.34" +500,"External Calibration Error No.35" +500,
"External Calibration Error No.36" +500,"External Calibration Error No.37" +500,"External Calibration Error No.38" +500,"External Calibration Error No.39" +500,
"External Calibration Error No.40" +500,"External Calibration Error No.41" +500,"External Calibration Error No.42" +500,"External Calibration Error No.43" +500,
"External Calibration Error No.44" +500,"External Calibration Error No.45" +500,"External Calibration Error No.46" +500,"External Calibration Error No.100" +500,
"External Calibration Error No.101" +500,"External Calibration Error No.102" +500,"External Calibration Error No.103" +500,"External Calibration Error No.104" +500,
"External Calibration Error No.105" +500,"External Calibration Error No.106" +500,"External Calibration Error No.107" +500,"External Calibration Error No.108" +500,
"External Calibration Error No.109" +500,"External Calibration Error No.110" +500,"External Calibration Error No.111" +500,"External Calibration Error No.112" +500,
"External Calibration Error No.113" +500,"External Calibration Error No.114" +500,"External Calibration Error No.115" +500,"External Calibration Error No.116" +500,
"External Calibration Error No.117" +500,"External Calibration Error No.118" +500,"External Calibration Error No.119" +500,"External Calibration Error No.120" +500,
"External Calibration Error No.121" +500,"External Calibration Error No.122" +500,"External Calibration Error No.123" +500,"External Calibration Error No.124" +500,
"External Calibration Error No.125" +500,"External Calibration Error No.126" +500,"External Calibration Error No.127" +500,"External Calibration Error No.128" +500,
"External Calibration Error No.129" +500,"External Calibration Error No.130" +500,"External Calibration Error No.131" +500,"External Calibration Error No.132" +500,
"External Calibration Error No.133" +500,"External Calibration Error No.134" +500,"External Calibration Error No.135" +500,"External Calibration Error No.136" +500,
"External Calibration Error No.137" +500,"External Calibration Error No.138" +500,"External Calibration Error No.139" +500,"External Calibration Error No.140" +500,
"External Calibration Error No.141" +500,"External Calibration Error No.142" +500,"External Calibration Error No.143" +500,"External Calibration Error No.144" +500,
"External Calibration Error No.145" +500,"External Calibration Error No.146" +500,"External Calibration Error No.200" +500,"External Calibration Error No.201" +500,
"External Calibration Error No.202" +500,"External Calibration Error No.203" +500,"External Calibration Error No.300" +500,"External Calibration Error No.301" +500,
"External Calibration Error No.302" +500,"External Calibration Error No.303" +600,"Internal Calibration Error No.400" +600,"Internal Calibration Error No.401" +600,
"Internal Calibration Error No.402" +600,"Internal Calibration Error No.403" +600,"Internal Calibration Error No.404" +600,"Internal Calibration Error No.405" +600,
"Internal Calibration Error No.406" +600,"Internal Calibration Error No.407" +600,"Internal Calibration Error No.408" +600,"Internal Calibration Error No.409" +600,
"Internal Calibration Error No.500" +600,"Internal Calibration Error No.501" +600,"Internal Calibration Error No.502" +600,"Internal Calibration Error No.503" +600,
"Internal Calibration Error No.504" +600,"Internal Calibration Error No.505" +600,"Internal Calibration Error No.506" +600,"Internal Calibration Error No.507" +600,
"Internal Calibration Error No.508" +600,"Internal Calibration Error No.509" +600,"Internal Calibration Error No.510" +600,"Internal Calibration Error No.511" +600,
"Internal Calibration Error No.512" +600,"Internal Calibration Error No.513" +600,"Internal Calibration Error No.514" +600,"Internal Calibration Error No.515" +600,
"Internal Calibration Error No.516" +600,"Internal Calibration Error No.517" +600,"Internal Calibration Error No.518" +600,"Internal Calibration Error No.600" +600,
"Internal Calibration Error No.601" +600,"Internal Calibration Error No.602" +600,"Internal Calibration Error No.603" +600,"Internal Calibration Error No.604" +600,
"Internal Calibration Error No.605" +600,"Internal Calibration Error No.606" +600,"Internal Calibration Error No.607" +600,"Internal Calibration Error No.608" +600,
"Internal Calibration Error No.609" +600,"Internal Calibration Error No.610" +600,"Internal Calibration Error No.611" +600,"Internal Calibration Error No.612" +600,
"Internal Calibration Error No.613" +600,"Internal Calibration Error No.614" +600,"Internal Calibration Error No.615" +600,"Internal Calibration Error No.616" +600,
"Internal Calibration Error No.617" +600,"Internal Calibration Error No.618" +600,"Internal Calibration Error No.619" +600,"Internal Calibration Error No.620" +600,
"Internal Calibration Error No.621" +600,"Internal Calibration Error No.622" +600,"Internal Calibration Error No.623" +600,"Internal Calibration Error No.624" +600,
"Internal Calibration Error No.625" +600,"Internal Calibration Error No.626" +600,"Internal Calibration Error No.627" +600,"Internal Calibration Error No.628" +600,
"Internal Calibration Error No.629" +600,"Internal Calibration Error No.630" +600,"Internal Calibration Error No.631" +600,"Internal Calibration Error No.632" +600,
"Internal Calibration Error No.633" +600,"Internal Calibration Error No.634" +600,"Internal Calibration Error No.635" +600,"Internal Calibration Error No.636" +600,
"Internal Calibration Error No.637" +600,"Internal Calibration Error No.638" +600,"Internal Calibration Error No.639" +600,"Internal Calibration Error No.640" +600,
"Internal Calibration Error No.641" +600,"Internal Calibration Error No.642" +600,"Internal Calibration Error No.643" +600,"Internal Calibration Error No.644" +600,
"Internal Calibration Error No.645" +600,"Internal Calibration Error No.646"
PRI BC DACO FC FS MCP MRO MRD MST MSD MCI MFR MADL MCT IRFD IRPO IRO IRD INS ISE QCL PRE OSE OSR QSE QSR MSE TLD TL TES TRC TRD SCT SCC SCS SCP
ART ARN ARS INIC DFO FT TIME DATE IN LGU LF DS STAD BP LOP LO CO RTD TI AZ POH PDV FPT FPI OCHK *WAI *SRE *SAV *OPC
KOTT ISPS MRPO KRMS IRFZ KOTL IRNO KZMD KYMD KXMD OCMP LOMD KDEV IRFG *TST *RST HIMD KDBM *OPT ICAL *TRG *ESR *STB *CLS *RCL *ESE *IDN RTU TRT
TRS TRP TRN TLS MSR MSP MRP MNS FTR TIN SUB ERR STA RAT MIP AVN SCN ARP HIP INI PLC MDL AVE SCD FPC ICL ARD ARC DAO ABO KDB CAL DFE ICALOHT ICALDCT
ICALACT ST KZ KY KX SM SL RL IT BZ GT NL KN RE CS FL HI DL DI CF DA KDEVMD ICALOH KDBMMD Z ICALDC ICALAC R F E CALZR CALZF CALOH KDBMD CALDC NV
SUBM? SUBM FILTER? FILT FILTER APER? APER NPLC? NPLC
RANG: APERTURE COUPLING RANGE? DIGITS? RANGE: NPLCYCLES APERTURE? SUBMEASURE COUPLING? COUP NPLCYCLES? DIG RANG SUBMEASURE? SUBMEASURE: COUP? SUBM: FILT? RANGE DIG? DIGITS RANG?
COMP? COMPLETE? COUNT? COUNT
DELAY LAYER2: SOURCE? SOURCE: DEL? COMPLETE PASS SOUR? COUN DELAY? SOUR: COMP SOURCE LAY2: DEL PASS? COUN? SOUR
DELAY COMP? SOURCE? SOURCE: DEL? COMPLETE PASS SOUR? COUN DELAY? SOUR: COMP SOURCE DEL PASS? COUN? SOUR
STATE?
STAT STAT? STATE
EXTERNAL EXT? EXTERNAL? EXT: EXTERNAL: INT: EXT INTERNAL:
STATISTICS: LIMIT: FORMAT: FORMAT?
DFILTER DFIL: FORM DFILTER? STAT: NULL: FORM? DFILTER: FORM: DFIL LIM: FORMAT DFIL?
LENG? LENG
TEMP TEMP? LENGTH LENGTH?
RTD? RTD OTEMPERATURE: RMS? SCALING:
DEV? OTEM: STATE? RMS DB? STAT DBM? SCAL: DEVIATION DEV STATE DB STAT? DBM RTD: DEVIATION?
BEEP? BEEPER? BEEP UPP? UPP LOWER?
LOW STAT? STATE? LOW? PASS: BEEPER UPPER LOWER UPPER? STAT STATE
UPP UPPER MID? LOW LOWER MID UPP? UPPER? LOW? LOWER?
FRESISTANCE RESISTANCE VOLT: PERIOD VOLTAGE: CURRENT: CURR: FRES RES FREQ PER FREQUENCY
COUN? COUN
STAT? COUNT STAT STATE? STATE DATA? COUNT?
AC: DC:
APER? APER APERTURE
DIGITS? NPLCYCLES? DIG? RANGE NPLC? RANG? DIGITS NPLCYCLES RANG: DIG APERTURE? NPLC RANG RANGE? RANGE:
PROTECTION? PROTECTION APER? APER NPLC
RANGE: NPLCYCLES RANGE NPLC? APERTURE? RANG? DIGITS? RANG: APERTURE RANG RAT? DIGITS RATIO? RAT PROT? RATIO DIG? PROT NPLCYCLES? RANGE? DIG
ALL
BLOC? BLOCK
BLOC STRING STR STRING? STR? BLOCK?
AVER STAT? STAT
AVER? AVERAGE? STATE STATE? SMO SMOOTHING SMO? AVERAGE SMOOTHING?
NUMBER NUMB? NUMBER? POIN POINTS NUMB
POIN? POINTS? STATE STAT STATE? STAT? POIN POINTS
NUMBER NUMB? NUMBER? DATA? EEPROM: RAM NUMB
NUMBER NUMB? NUMBER? DATA? EEPROM: RAM NUMB
EEPROM: OHM
OHM: DCV? DCV: ZERO: OHM? DCV
FRONT
REAR FRON FRONT: REAR: FRON:
ELEMENTS? DATA ELEM DATA? ELEM? ELEMENTS
LEVEL COUP? COUPLING? SOURCE
RANGE: SOURCE? COUP APERTURE? APER? RANG: APERTURE APER LEV? COUPLING CURRENT: SOUR? LEV LEVEL? VOLT: SOUR VOLTAGE: CURR:
DELI: DELIMITER:
HOSEI: NUMB? EEPROM:
HOSEI NUMBER? RAM? TEMP? NUMBER RAM NUMB TEMPERATURE? HOSEI?
HOSEI: NUMB? EEPROM:
HOSEI NUMBER? RAM? TEMP? NUMBER RAM NUMB TEMPERATURE? HOSEI?
*WAI *SRE? *SRE *RST *OPC
*ESE *ESE? *IDN? *TST? *OPT? *TRG *SAV *ESR? *STB? *CLS *RCL *OPC?
CONTINUOUS CONT? CONTINUOUS? CONT
TERMINAL GUAR? GUAR
GUARD GUARD? TERM TERMINAL? TERM?
OHM:
ALL AC: OHM DCV: AC DCV
NUMB NUMBER
TEMPERATURE? RAM TEMP? NUMB? NUMBER? RAM? EEPROM:
OUTPUT: :OUTPUT: ROUTE: :ROUTE: TRAC: TRACE: :TRACE: STAT: :STAT: :STATUS: TSYS: :TSYS: :TSYSTEM: :TRIG: TRIGGER: ABOR :ABOR INIT: :INIT: INITIATE: INIT :INIT FORM? :FORM? :FORMAT? :FORM :FORMAT FORM: :FORM: INP: :INP: LFRE? :LFRE? :DISP? :DISP :CAL: ITEMPERATURE? :ITEMPERATURE? :PER: :CURRENT: *WAI *SRE? *SRE *OPC
FORM DISP :CALIBRATION: MMEMORY: CURRENT: RES: *RST :SYSTEM: PER: INITIATE DISPLAY? ARM: :DISPLAY *TRG VOLTAGE: *SAV *CLS *RCL CAL: :LFREQUENCY? *ESE :FORMAT: FRESISTANCE: :PERIOD: :RESISTANCE: CALIBRATION: SYSTEM: STATUS: DISPLAY FORMAT? LFREQUENCY? :INPUT: FORMAT: PERIOD: RESISTANCE: :SENSE: :FREQUENCY: :CONFIGURE? :FETCH? WR :CONFIGURE: :CALCULATE: INPUT: FORMAT :SYST: :ROUT: :OUTP: :VOLT: SENSE: FREQUENCY: :ZERO: :ABORT :CURR: :SENS: CONFIGURE? FETCH? :ITEM? CONFIGURE: :FRES: :FREQ: :MMEM: :CONF? :TRAC: :FETC? :CONF: :READ? :INITIATE: CALCULATE: SYST: :CALC: ROUT: OUTP: VOLT: ZERO: ABORT CURR: SENS: TRIG: DISP? ITEM? FRES: FREQ: MMEM: CONF? *TST? :MMEMORY: FETC? CONF: :RES: *OPT? READ? :INITIATE :DISPLAY? :ARM: *ESR? *STB? :TRIGGER: :VOLTAGE: CALC: *OPC? *ESE? *IDN? :FRESISTANCE: TSYSTEM:
TRANSFER PST DRECALL: DSTORE:
PRECALL CAT? DSTORE DEL: DRECALL TRAN INIT DEL FREE? DELETE: PREC DREC: DELETE DST: PSTORE CATALOG? DREC INITIALIZE DST
STATE?
AUTO? LIMIT LIM LIMIT? LIM? AUTO
OCOM? OCOMPENSATED? OCOM OCOMPENSATED POW APER? APER DIG
RANG: RANGE: PROTECTION DIG? PROTECTION? APERTURE NPLCYCLES POWER PROT APERTURE? NPLCYCLES? POWER? PROT? DIGITS POW? DIGITS? NPLC RANG RANGE NPLC? RANG? RANGE?
SOURCE: APER? APER DIG
RANG: RANGE: DIG? APERTURE NPLCYCLES SOUR POWER APERTURE? SOURCE NPLCYCLES? SOUR? POWER? POW SOUR: SOURCE? DIGITS POW? DIGITS? NPLC RANG RANGE NPLC? RANG? RANGE?
SCAN
CLOSE CLOSE? OPEN CLOS SCAN? CLOS? SCAN:
STAT? STATE?
STAT STATE
LFRE? ITEM? ZERO: PER: RES: CURRENT:
RESISTANCE: VOLTAGE: FRESISTANCE: FRES: PERIOD: FREQ: ITEMPERATURE? LFREQUENCY? VOLT: FREQUENCY: CURR:
PRESET OPER:
MEASUREMENT: QUE: PRES OPERATION: QUEUE: QUES: MEAS: QUESTIONABLE:
ENABLE?
EVENT? ENABLE ENAB EVEN? ENAB?
ENABLE?
EVENT? ENABLE ENAB EVEN? ENAB?
ENABLE?
EVENT? ENABLE ENAB EVEN? ENAB?
STATE STATE? STAT STAT?
VERS? BEEPER:
DATE BEEP: ERROR? TIME? TIME ERR? VERSION? DATE? GPIB:
PRET?
PRET PRETRIGGER PRETRIGGER?
NUMBER? POIN? POINTS? POIN POINTS BCON? CLEAR
STATE CLE DATA: STAT? BCON BCONTROL? NUMBER NUMB? BCONTROL: STATE? FAST: STAT BCONTROL NUMB BCON: DATA?
POIN? POINTS? NUMB? NUMBER?
ZERO? DATA? GAIN?
COMPLETE? COUNT? COUNT
DELAY COMP? SOURCE? SOURCE: DEL? COMPLETE PASS SOUR? COUN DELAY? SOUR: COMP SOURCE DEL PASS? COUN? SOUR
TIM? TIMER TIMER? TIM
SLOPE?
SLOP SLOP? SLOPE
RATE? STATE STATE? STAT STAT? RATE
TIM? TIMER TIMER? TIM
TIM? TIMER TIMER? TIM
DISP DISPLAY DISP? DISPLAY?
SLOPE SLOPE? SLOP SLOP?
LAYER: LEVEL?
LEVEL: LEV? FAST: LEV: LAY: LEVEL EXTERNAL: LEV EXT:
DC AC
DC: AC:
AUTO AUTO?
RANGE? RANG RANG? RANGE
RANGE? RANG RANG? RANGE
STATE STATE? STAT STAT?
CLE
CLEAR
NUMBER NUMB? NUMBER? DATA? EEPROM: RAM NUMB
NUMBER NUMB? NUMBER? DATA? EEPROM: RAM NUMB
DEF? NEW?
DEF? NEW?
REF? DEF? NEW?
REF? DEF? NEW?
PROTECTION
STORE
DEF? NEW?
DEF? NEW?
DEF? NEW?
NUMB?
NUMB NUMBER NUMBER? STORE
NUMB?
NUMB NUMBER NUMBER? STORE
STAT? STAT
OFFS? COLUMN? OFFSET STATE COL OFFSET? STATE? COL? OFFS COLUMN
STAT? STATE?
STAT STATE
STAT? STATE?
STAT STATE
BCD:
ANALOGOUT: PRINTER: PRIN: ANAL: BCDOUT:
UNIT? UNIT
FAIL PASS OFF
RTD OTEMPERATURE
DELT DB DELTA DEV SCAL RMS OTEM DEVIATION SCALING NONE DBM
SMO NONE AVER SMOOTHING AVERAGE
CRLF LFEO LFEOI LF EOI
CRLF
SPAC COMM COMMA SPACE
MID SLOW FAST
REAL
ASC ASCII
VOLTAGE CURR CURRENT VOLT
LOW FLOAT FLO
FREQUENCY PERIOD FREQ PER
FRON
REAR FRONT
DEF INF MAXIMUM INFINITE MINIMUM DEFAULT MAX MIN
MEM MEMORY GPIB
POSITIVE NEG POS NEGATIVE
TIM EXT EXTERNAL
IMM TIMER MAN IMMEDIATE MANUAL LEVEL BUS LEV
TIM EXT EXTERNAL
IMM TLINK TIMER MAN TLIN IMMEDIATE MANUAL LEVEL BUS LEV
TIM LINE EXT EXTERNAL
IMM TIMER MAN IMMEDIATE MANUAL LEVEL BUS LEV
DC AC
FAST
OCOMPENSATED OCOM
CHECK OCOMPENSATED OCOM CHEC
HI LOW
INT INTEGER
IPTS68
ITS ITS90 IPTS
PRET
FULL PRETRIGGER
EXTERNAL
EXT MANUAL BUS MAN
FORMAT DFILTER NULL 4WCHECK
DFIL SHEADER TIMESTAMP CHANNEL CHAN 4WCH HEADER HEAD LIMIT FORM NONE TIME LIM SHE
MAX DEF MIN MAXIMUM MINIMUM DEFAULT
DEF
MAX MEASUREMENT MIN MAXIMUM MINIMUM DEFAULT MEAS
K C F
IT = RATE = PLC 1 2 3 4 5 6 7 8 9 10 20 30 40 50 60 70 80 90 100 200 300 400 500 600 700 800 900
LEVEL = %
START-CH No STOP-CH No CLOSE-CH No
EXTERNAL INTERNAL
ZERO DCV OHM ALL ACV
FREE= BYTE
FILE .PNL .DAT
OFF ON
DATE NV
TIME NV
INT TEMP=
LINE = 50Hz 60Hz
SELECT FILE No NV
PANEL .PNL NV
STORE DATA (MAX: NV
COUNT = N = NV
PASS FAIL UP: MID: LOW:
SAMPLE =
key:NEXT DATA SAMPLE MAX MIN MAX-MIN › SIGMA UCL LCL
CONFIGURE MODE RECALL CONFIG MODE PUSH FUNCTION,COMMAND,etc KEY PUSH EXIT OR HOME KEY PUSH MATH KEY OFF ON SET PROTECT CONFIGURE DCV SET RATIO INTEG-TIME DIGITS PROTECT
RATIO CONFIGURE ACV SELECT FILTER SELECT COUPLING SELECT SUBMEASURE INTEG-TIME DIGITS FILTER
COUPLING SUBMEASURE FAST MID SLOW AC ACDC OFF FREQUENCY PERIOD SELECT POWER CONFIGURE 2W
SELECT UPPER LIMIT SELECT LOWER LIMIT CONFIGURE 4W
SELECT LIMIT SELECT MEASURE HI LOW INTEG-TIME DIGITS MEASURE
RANGE-LIMIT POWER PROTECT ì RANGE-LIMIT POWER 10 100 1000 10k 100k 1000k 10M 100M 1000M NORMAL OHM-COMP NORMAL OHM-COMP WIRE-CHECK
CONFIGURE DCI INTEG-TIME DIGITS CONFIGURE ACI ì COUPLING SUBMEASURE SELECT FREQ,PERIOD CONFIGURE FREQ CONFIGURE PERIOD SELECT SOURCE FREQUENCY PERIOD GATE-TIME LEVEL COUPLING
SOURCE VOLTAGE CURRENT SET GATE-TIME 100˜S 1mS 10mS 100mS 1S
key:CHANGE INTEGRATION TIME
key:CHANGE RATE TIME
key:CHANGE GPIB ADDRESS
key:CHANGE NUMBER
key:CHANGE NUMBER
SELECT DIGITS 4Œ 5Œ 6Œ 7Œ 8Œ 4Œ 5Œ 6Œ 7Œ 4Œ 5Œ 6Œ
SELECT MENU ACCESSORY:NONE BEEPER
ACCESSORY:2WSCANNER BEEPER
ACCESSORY:4WSCANNER BEEPER
ACCESSORY:ANALOG
BEEPER
ACCESSORY:BCD BEEPER
ACCESSORY:PRINTER BEEPER
CALIBRATION DATA-FORMAT
DISPLAY GPIB INTERNAL-TEMP
LINE-FREQ MEMORYCARD RESETë ì
TEST TIME SET ANALOG OUTPUT CONFIG ANALOG OUT 119999999 SELECT OFFSET ADJUST VOLUME(1V) COLUMN OFFSET UNIT-CAL
key:SELECT COLUMN
SET BCD OUTPUT SET PRINTER SET SCANNER CONFIGURE SCANNER CHANNEL OPEN SCANNER OPEN CLOSE SET BEEPER CONFIG DATA-FORMAT SELECT DATA-FORMAT SET ELEMENTS DATA-FORMAT ELEMENTS ASCII REAL64 NONE HEADER:
NONE HEADER: COMP:
SUBMEAS-HEAD: COMP:
WIRE-CHECK: CHANNEL:
NULL: DFILTER:
FORMAT: TIMESTAMP:
SET DISPLAY SELECT CALIBRATION YES NO EXTERNAL INTERNAL ZERO-FRONT ZERO-REAR DCV OHM ALL DCV OHM AC ALL DCV OHM EXT CAL ZERO-FRONT EXECUTE ? EXT CAL ZERO_REAR EXECUTE ? EXT CAL DCV
EXECUTE ? EXT CAL OHM EXECUTE ? INT CAL ALL EXECUTE ? INT CAL DCV EXECUTE ? INT CAL OHM EXECUTE ? INT CAL AC EXECUTE ? CONFIGURE GPIB SELECT MODE SELECT LANGUAGE ADDRESS MODE LANGUAGE ADDRESSABLE
TALK-ONLY SCPI ADVANTEST MEMORYCARD SETUP INITIALIZE OK ? DELETE FILE DELETE ALL FILES ? FREE INITIALIZE TRANSFER
DELETE FILE ALL YES NO MEMORYCARD ACCESS MEMORYCARD CONFIGURE STORE
SELECT DEVICE SELECT BUFFER CNTL SELECT TRIG SOURCE CONFIGURE RECALL DATA RECALL MODE DEVICE SOURCE INTERNAL MEMORYCARD DATA PANEL BUFFER-FULL PRETRIGGER MANUAL EXTERNAL BUS INTERNAL MEMORY MANUAL AUTO
SELECT MATH FUNC SELECT FORMAT SET SCALING SELECT UNIT CONFIGURE OHM-TEMP SET STATISTICS SET COMPARATOR SELECT DFILTER SELECT ITS CONFIGURE RTD DFILTER FORMAT COMPARATOR
STATISTICS NONE SCALING DEVIATION DELTAë ì dB RMS dBm OHM-TEMP RTD X Y Z STORE key : MEASUREMENT DATA C F K TEMP LENGTH OFF ON READ UPPER LOWER SET-PASS BEEPER OFF FAIL PASS NONE SMOOTHING
AVERAGING IPTS68 ITS90 ITS UNIT CONFIGURE ARM CONFIGURE SCAN CONFIGURE TRIG SET PASS SET COMPLETE CONFIGURE SLOPE SELECT SLOPE CONFIG TRIG SYSTEM
SET INITIATE SET COUNT SET LAYERDISP TRIG SCAN ARM INITIATE SLOPE
LEVEL LAYERDISP FAST-MODE
HALT SOURCE PASS DELAY COUNT
COMPLETE IMMEDIATE MANUAL EXTERNAL
BUS LEVEL TIMER ì BUS LEVEL TIMER TLINK
BUS LEVEL TIMER LINE EXTERNAL-TRIG LEVEL-TRIG NEGATIVE POSITIVE PUSH TRIG KET CONTINUOUS-OFF CONTINUOUS-ON INFINITE NUMBER
SET FAST MODE CONFIG FAST MODE RATE DATA-COUNT TRIGGER FAST MODE SELECT INPUT FRONT REAR SELECT GUARD FLOAT LOW
1000 V Range 750 V Range 100 V Range 10 V Range 1000mV Range 100mV Range 10mV Range
10 Range 100 Range 1000 Range 10k Range 100k Range 1000k Range 10M Range 100M Range 1000M Range
10nA Range 100nA Range 1000nA Range 10˜A Range 100˜A Range 1000˜A Range 10mA Range 100mA Range 1000mA Range
mHz Hz kHz MHz
nS ˜S mS S
STORE:INTERNAL STORE:MEMORYCARD STORE SMOOTH AVERAGE
SCALING %DEVIAT DELTA dB RMS dBm OHMTEMP RTD
STATISTICS COUPLING:AC COUPLING:ACDC
MEASURE:OHM COMP WIRE:OK
OPEN:I-HI OPEN:V-HI OPEN:V-LO OPEN:VI-LO WIRE:NOT
SOURCE:VOLTAGE SOURCE:CURRENT E-09 E-06 E-03 E+00 E+03 E+06 E+37
990000000 mVDC VDC B/A
mVAC VAC
2W k 2W M 2W
nADC ˜ADC mADC ADC
nAAC ˜AAC mAAC AAC
mHz Hz kHz MHz
nSEC ˜SEC mSEC SEC
***** SET *****
DISPLAY OFF
OVERLOAD OVERFLOW
EXT CALIBRATING INT CALIBRATING STORING CAL DATA ZERO_FRONT ZERO_REAR DCV REF7.2 OHM REF10k DCV ACV DCI ACI OHM AC 4W HI 4W LO 2W HI 2W LO
FREQ INTERNAL OFFSET AC/DC GAIN TEMP
LAYER IDLE ARM SCAN TRIG
X= Y= Z= R= L= UP= LO= INPUT LIMIT OVER DIAG MODE RESET SRAM DRAM DISPLAY KEY ë ì TRANSFER A/D INTERNAL ë ì CURRENT AC OPTION
A_1 CHECK MƒA_2 CHECK AƒM_1 CHECK AƒM_2 CHECK MƒA_1 MƒA_2 AƒM_1 AƒM_2
A/D_1 CHECK A/D_2 CHECK A/D_3 CHECK A/D_4 CHECK A/D_5 CHECK A/D_1 A/D_2 A/D_3 A/D_4 A/D_5
INTERNAL CHECK 1Zero_1 1Zero_2 10Zero 100Zero 7.2Vref -10Vref -1Vref -0.1Vref Int_temp
CURRENT CHECK 10mA 1000uA 100uA 10uA 1000nA 100nA 10nA
AC CHECK AMP_OFF VCA_OFF AC_REF1 AC_REF2 ABS_DEAD1
ABS_DEAD2 ABS_OFF1 ABS_OFF2 10VF_1 10VF_2 10VF_3 10VF_4
OPTION CHECK ANALOGOUT PRINTER BCD SCANNER
SCANNER CHECK OPEN CLOSE
NUMBER : NAME : NONE CONFIGURE 2W 4W
UP DOWN MENU ERR? NULL AZERO STORE RECALL MATH TRIGGER î (UP ARROW) ì (LEFT ARROW) ë (RIGHT ARROW) í (DOWN ARROW) HOME EXIT ENTER FRONT/REAR LO-G 1980 01 01 00 00 00
PNL .DAT
R6581 RevA00 R6581D RevA00 R6581 FUNCTION: DCV ACV DCI ACI 2WOHM 4WOHM FREQ PERIOD 2WO 4WO FRQ PER
AC ACDC
DACV ACDCV ACI ACDCI
RANGE: AUTO 10mV 100mV 1000mV 10V 100V 750V 1000V
10nA 100nA 1000nA 10uA 100uA 1000uA 10mA 100mA 1000mA
10OHM 100OHM 1000OHM 10kOHM 100kOHM 1000kOHM 10MOHM 100MOHM 1000MOHM
IT= 1uSEC 2uSEC 3uSEC 4uSEC 5uSEC 6uSEC 7uSEC 8uSEC 9uSEC 10uSEC 20uSEC 30uSEC 40uSEC 50uSEC 60uSEC 70uSEC 80uSEC 90uSEC 100uSEC 200uSEC 300uSEC 400uSEC 500uSEC 600uSEC 700uSEC 800uSEC 900uSEC 1mSEC 2mSEC 3mSEC 4mSEC 5mSEC 6mSEC 7mSEC 8mSEC 9mSEC 10mSEC 100mSEC 1SEC
1PLC 2PLC 3PLC 4PLC 5PLC 6PLC 7PLC 8PLC 9PLC 10PLC 20PLC 30PLC 40PLC 50PLC 60PLC 70PLC 80PLC 90PLC 100PLC
OFF ON
PASS FAIL PAS FAL ERR
DIGITS: 3.5 4.5 5.5 6.5 7.5 8.5
:PROTECT: RATIO: FILTER: FAST MID SLOW
SUBMEAS:
OHM MEAS: OHM COMP WIRE CHK OK IHI VHI VLO VIL NOT
INPUT SOURCE: VOLTAGE CURRENT
LEVEL= AZERO: NULL: NULL= NUL
:DFILT: NONE SMOOTHING AVERAGING MEDIAN NON SMO AVE MED
SMOOTH= AVERAGE= FORMAT: SCALING DEVIATION DELTA dB RMS dBm OHM TEMP RTD SCL DEV DEL TMP
X= Y= Z= DEV= dB= RMS= dBm= TEMP= LENGTH= ITS: IPTS68 ITS90
UNIT: C F K
COMPARATOR: COMP UP= COMP LO= COMP UP: COMP MID: COMP LO: FAST MODE: FAST MODE DEV: MEMORY GPIB
FAST MODE RATE:
SCANNER: START CH: STOP CH: STORE MODE:0x 0123456789abcdef START No STOP No SAMPLE= NV
COUPLING: RANGE LIMIT UP: RANGE LIMIT LO: POWER: VOLT RANGE: CURR RANGE: COMP BEEP: COMP OUT
STATISTIC: STATIS= COMMA SPACE CRLF LF EOI LFEOI GPIB STRING:
GPIB BLOCK:
BEEP: LO GUARD: LOW FLOAT
INPUT: FRONT REAR
DATA FORMAT: DATA ELEMENT:0x ASCII REAL64
LAYER DISP: INITIATE CONTINUOUS: IMMEDIATE MANUAL BUS EXTERNAL LEVEL TLINK LINE TIMER
INFINITE ARM PASS: ARM SOURCE: ARM DELAY= ARM COUNT= ARM TIMER= ARM COMPLETE: SCAN PASS: SCAN SOURCE: SCAN DELAY= SCAN COUNT= SCAN TIMER= SCAN COMPLETE: TRIG PASS: TRIG SOURCE: TRIG DELAY= TRIG COUNT= TRIG TIMER= TRIG COMPLETE: TRIG SLOPE EXT: TRIG SLOPE LEVEL: POSITIVE NEGATIVE
TRIG LEVEL= INTERNAL MEMORY BUFFER CTRL: PRETRIG FULL
PRETRIG:
DATA POIN= RECALL POINT= MEMORYCARD SCANNER SCAN= BCD: PRINTER: ANALOGOUT: COLUMN= OFFSET: DCV_Data_Processing XREF[1]: FUN_0000c7d0:0000c89a(*)
0000a974 4e 56 00 00 link.w A6,0
0000a978 48 e7 0c 00 movem.l { D5 D4},-(SP)
0000a97c 3a 2e 00 0a move.w (arg_2,A6),D5w
0000a980 38 2e 00 0e move.w (Tint_idx,A6),D4w
0000a984 2c 39 00 move.l (DAT_0023a49c).l,D6
23 a4 9c
0000a98a 2e 39 00 move.l (DAT_0023a4a0).l,D7
23 a4 a0
0000a990 41 f9 00 lea (0x4f6c20).l,A0
4f 6c 20
0000a996 4e b9 00 jsr math_sub.l undefined math_sub(void)
08 e3 d2
0000a99c 41 f9 00 lea (0x4f6c30).l,A0
4f 6c 30
0000a9a2 4e b9 00 jsr math_mul.l undefined math_mul(void)
08 e6 34
0000a9a8 41 f9 00 lea (0x4f6c28).l,A0
4f 6c 28
0000a9ae 4e b9 00 jsr math_sub.l undefined math_sub(void)
08 e3 d2
0000a9b4 23 c6 00 move.l D6,(Measurement_result).l
23 a4 bc
0000a9ba 23 c7 00 move.l D7,(Measurement_result_).l
23 a4 c0
0000a9c0 0c 45 00 03 cmpi.w #3,D5w
0000a9c4 66 0c bne.b loc_A9D2
0000a9c6 0c 44 00 2e cmpi.w #46,D4w
0000a9ca 6d 06 blt.b loc_A9D2
0000a9cc 4e ba 02 94 jsr ADC_Linearization undefined ADC_Linearization(void)
0000a9d0 60 0a bra.b loc_A9DC
So these are some kind of "cheat codes" :)
My hope to find signature files, like the libraries themselves, faded away every year and today has completely died out. The Japanese did not exactly take the source from Plauger's floppy disks, but some rather close version, which they supplemented with pieces from other libraries and their own creativity. As a result, we got a monster, in which there are four types of string copying operations alone (with and without a terminator, with direct order of arguments and reverse, with result and void).
So I gave up on automation and manually parsed the most critical of STDIO, SDTLIB, MATH and STRINGS. At the moment, in the firmware of my experimental R6581, out of 2677 functions, 600-odd pieces have been identified and data structures of the same order have been parsed. I understand perfectly well that this is a drop in the ocean, and that I have not yet been closely involved in the analysis of low-level exchange protocols with iron (due to the lack of a "wide" logic analyzer), but in the end it's just fun
Here are the cunning Japanese! In Advantest R6581, I did find a "bookmark" :)
When I deciphered the structure of the SCPI and ADC command keyword fields and isolated the procedures responsible for these commands in the code, I found that out of 484 procedures, 53 pcs. are not described in the manual and become available via the GPIB interface only after the protection flag is removed by a special command. These "secret" procedures are divided into several classes and have completely different command syntax, ranging from the simplest WR to monsters, such as CALIBRATION:INTERNAL:DCV:HOSEI:NUMBER or CALIBRATION:EXTERNAL:ZERO:FRONT:EEPROM:DEF? By the way, "HOSEI" here is a reference to a famous Japanese university.
As a result, you can get low-level access to the ADC and all analog nodes, as well as calibration constants of different levels (in RAM, EEPROM) and functions. All this happens completely transparent to the main operation of the device. That is, for example, we send the control word 0x4800 (ADC Reset), and garbage or OVERLOAD flickers on the display for a moment, because. the tasks for reading and displaying results received incorrect data.
I have not come across the R6551 firmware yet, but there is reason to believe that it can also contain this kind of service commands.
::ABORt
:ARM:COMPlete
:ARM:COMPlete?
:ARM:COUNt
:ARM:COUNt?
:ARM:DELay
:ARM:DELay?
:ARM:LAYer2:COMPlete
:ARM:LAYer2:COMPlete?
:ARM:LAYer2:COUNt
:ARM:LAYer2:COUNt?
:ARM:LAYer2:DELay
:ARM:LAYer2:DELay?
:ARM:LAYer2:PASS
:ARM:LAYer2:PASS?
:ARM:LAYer2:SOURce
:ARM:LAYer2:SOURce?
:ARM:LAYer2:SOURce:TIMer
:ARM:LAYer2:SOURce:TIMer?
:ARM:PASS
:ARM:PASS?
:ARM:SOURce
:ARM:SOURce?
:ARM:SOURce:TIMer
:ARM:SOURce:TIMer?
:CALCulate:DFILter
:CALCulate:DFILter?
:CALCulate:DFILter:AVERage
:CALCulate:DFILter:AVERage?
:CALCulate:DFILter:SMOothing
:CALCulate:DFILter:SMOothing?
:CALCulate:DFILter:STATe
:CALCulate:DFILter:STATe?
:CALCulate:FORMat
:CALCulate:FORMat?
:CALCulate:FORMat:DB
:CALCulate:FORMat:DB?
:CALCulate:FORMat:DBM
:CALCulate:FORMat:DBM?
:CALCulate:FORMat:DEViation
:CALCulate:FORMat:DEViation?
:CALCulate:FORMat:OTEMperature:LENGth
:CALCulate:FORMat:OTEMperature:LENGth?
:CALCulate:FORMat:OTEMperature:TEMP
:CALCulate:FORMat:OTEMperature:TEMP?
:CALCulate:FORMat:RMS
:CALCulate:FORMat:RMS?
:CALCulate:FORMat:RTD
:CALCulate:FORMat:RTD?
:CALCulate:FORMat:RTD:UNIT
:CALCulate:FORMat:RTD:UNIT?
:CALCulate:FORMat:SCALing:X
:CALCulate:FORMat:SCALing:X?
:CALCulate:FORMat:SCALing:Y
:CALCulate:FORMat:SCALing:Y?
:CALCulate:FORMat:SCALing:Z
:CALCulate:FORMat:SCALing:Z?
:CALCulate:FORMat:STATe
:CALCulate:FORMat:STATe?
:CALCulate:LIMit:BEEPer
:CALCulate:LIMit:BEEPer?
:CALCulate:LIMit:LOWer
:CALCulate:LIMit:LOWer?
:CALCulate:LIMit:PASS:LOWer
:CALCulate:LIMit:PASS:LOWer?
:CALCulate:LIMit:PASS:MID
:CALCulate:LIMit:PASS:MID?
:CALCulate:LIMit:PASS:UPPer
:CALCulate:LIMit:PASS:UPPer?
:CALCulate:LIMit:STATe
:CALCulate:LIMit:STATe?
:CALCulate:LIMit:UPPer
:CALCulate:LIMit:UPPer?
:CALCulate:NULL:DATA?
:CALCulate:NULL:STATe
:CALCulate:NULL:STATe?
:CALCulate:STATistics:COUNt
:CALCulate:STATistics:COUNt?
:CALCulate:STATistics:DATA?
:CALCulate:STATistics:STATe
:CALCulate:STATistics:STATe?
:CALibration:EXTernal
:CALibration:EXTernal?
:CALibration:EXTernal:DCV
:CALibration:EXTernal:DCV?
:CALibration:EXTernal:DCV:DATA?
:CALibration:EXTernal:DCV:EEPROM:DEF?
:CALibration:EXTernal:DCV:EEPROM:NEW?
:CALibration:EXTernal:DCV:EEPROM:REF?
:CALibration:EXTernal:DCV:NUMBer
:CALibration:EXTernal:DCV:NUMBer?
:CALibration:EXTernal:DCV:RAM
:CALibration:EXTernal:EEPROM:PROTECTION {ON|1|OFF|0}
:CALibration:EXTernal:EEPROM:STORE
:CALibration:EXTernal:OHM
:CALibration:EXTernal:OHM?
:CALibration:EXTernal:OHM:DATA?
:CALibration:EXTernal:OHM:EEPROM:DEF?
:CALibration:EXTernal:OHM:EEPROM:NEW?
:CALibration:EXTernal:OHM:EEPROM:REF?
:CALibration:EXTernal:OHM:NUMBer
:CALibration:EXTernal:OHM:NUMBer?
:CALibration:EXTernal:OHM:RAM
:CALibration:EXTernal:ZERO:FRONt
:CALibration:EXTernal:ZERO:FRONt:DATA?
:CALibration:EXTernal:ZERO:FRONt:EEPROM:DEF?
:CALibration:EXTernal:ZERO:FRONt:EEPROM:NEW?
:CALibration:EXTernal:ZERO:FRONt:NUMBer
:CALibration:EXTernal:ZERO:FRONt:NUMBer?
:CALibration:EXTernal:ZERO:FRONt:RAM
:CALibration:EXTernal:ZERO:REAR
:CALibration:EXTernal:ZERO:REAR:DATA?
:CALibration:EXTernal:ZERO:REAR:EEPROM:DEF?
:CALibration:EXTernal:ZERO:REAR:EEPROM:NEW?
:CALibration:EXTernal:ZERO:REAR:NUMBer
:CALibration:EXTernal:ZERO:REAR:NUMBer?
:CALibration:EXTernal:ZERO:REAR:RAM
:CALibration:INTernal:AC
:CALibration:INTernal:AC:EEPROM:DEF?
:CALibration:INTernal:AC:EEPROM:NEW?
:CALibration:INTernal:AC:HOSEI
:CALibration:INTernal:AC:HOSEI?
:CALibration:INTernal:AC:HOSEI:NUMBer
:CALibration:INTernal:AC:HOSEI:NUMBer?
:CALibration:INTernal:AC:HOSEI:STORE
:CALibration:INTernal:AC:NUMBer
:CALibration:INTernal:AC:NUMBer?
:CALibration:INTernal:AC:RAM
:CALibration:INTernal:AC:RAM?
:CALibration:INTernal:AC:TEMPerature?
:CALibration:INTernal:ALL
:CALibration:INTernal:DCV
:CALibration:INTernal:DCV:EEPROM:DEF?
:CALibration:INTernal:DCV:EEPROM:NEW?
:CALibration:INTernal:DCV:HOSEI
:CALibration:INTernal:DCV:HOSEI?
:CALibration:INTernal:DCV:HOSEI:NUMBer
:CALibration:INTernal:DCV:HOSEI:NUMBer?
:CALibration:INTernal:DCV:HOSEI:STORE
:CALibration:INTernal:DCV:NUMBer
:CALibration:INTernal:DCV:NUMBer?
:CALibration:INTernal:DCV:RAM
:CALibration:INTernal:DCV:RAM?
:CALibration:INTernal:DCV:TEMPerature?
:CALibration:INTernal:OHM
:CALibration:INTernal:OHM:EEPROM:DEF?
:CALibration:INTernal:OHM:EEPROM:NEW?
:CALibration:INTernal:OHM:NUMBer
:CALibration:INTernal:OHM:NUMBer?
:CALibration:INTernal:OHM:RAM
:CALibration:INTernal:OHM:RAM?
:CALibration:INTernal:OHM:TEMPerature?
*CLS
:CONFigure?
:CONFigure:CURRent:AC
:CONFigure:CURRent:DC
:CONFigure:FREQuency
:CONFigure:FRESistance
:CONFigure:PERiod
:CONFigure:RESistance
:CONFigure:VOLTage:AC
:CONFigure:VOLTage:DC
:DISPlay
:DISPlay?
*ESE
*ESE?
*ESR?
:FETCh?
:FORMat
:FORMat?
:FORMat:DATA
:FORMat:DATA?
:FORMat:ELEMents
:FORMat:ELEMents?
*IDN?
:INITiate
:INITiate:CONTinuous
:INITiate:CONTinuous?
:INPut:GUARd
:INPut:GUARd?
:INPut:TERMinal
:INPut:TERMinal?
:MMEMory:CATalog?
:MMEMory:DELete
:MMEMory:DELete:ALL
:MMEMory:DRECall
:MMEMory:DRECall:NUMBer
:MMEMory:DRECall:NUMBer?
:MMEMory:DRECall:POINts
:MMEMory:DSTore
:MMEMory:DSTore:POINts
:MMEMory:DSTore:POINts?
:MMEMory:DSTore:STATe
:MMEMory:DSTore:STATe?
:MMEMory:FREE?
:MMEMory:INITialize
:MMEMory:PRECall
:MMEMory:PSTore
:MMEMory:TRANsfer
*OPC
*OPC?
*OPT?
:OUTPut:ANALogout:COLumn
:OUTPut:ANALogout:COLumn?
:OUTPut:ANALogout:OFFSet
:OUTPut:ANALogout:OFFSet?
:OUTPut:ANALogout:STATe
:OUTPut:ANALogout:STATe?
:OUTPut:BCDout:STATe
:OUTPut:BCDout:STATe?
:OUTPut:PRINter:STATe
:OUTPut:PRINter:STATe?
*RCL
:READ?
:ROUTe:CLOSe
:ROUTe:CLOSe?
:ROUTe:OPEN
:ROUTe:SCAN
:ROUTe:SCAN?
:ROUTe:SCAN:STATe
:ROUTe:SCAN:STATe?
*RST
*SAV
[:SENSe:]CURRent:AC:APERture
[:SENSe:]CURRent:AC:APERture?
[:SENSe:]CURRent:AC:COUPling
[:SENSe:]CURRent:AC:COUPling?
[:SENSe:]CURRent:AC:DIGits
[:SENSe:]CURRent:AC:DIGits?
[:SENSe:]CURRent:AC:FILTer
[:SENSe:]CURRent:AC:FILTer?
[:SENSe:]CURRent:AC:NPLCycles
[:SENSe:]CURRent:AC:NPLCycles?
[:SENSe:]CURRent:AC:RANGe
[:SENSe:]CURRent:AC:RANGe?
[:SENSe:]CURRent:AC:RANGe:AUTO
[:SENSe:]CURRent:AC:RANGe:AUTO?
[:SENSe:]CURRent:AC:SUBMeasure
[:SENSe:]CURRent:AC:SUBMeasure?
[:SENSe:]CURRent:AC:SUBMeasure:STATe
[:SENSe:]CURRent:AC:SUBMeasure:STATe?
[:SENSe:]CURRent:DC:APERture
[:SENSe:]CURRent:DC:APERture?
[:SENSe:]CURRent:DC:DIGits
[:SENSe:]CURRent:DC:DIGits?
[:SENSe:]CURRent:DC:NPLCycles
[:SENSe:]CURRent:DC:NPLCycles?
[:SENSe:]CURRent:DC:RANGe
[:SENSe:]CURRent:DC:RANGe?
[:SENSe:]CURRent:DC:RANGe:AUTO
[:SENSe:]CURRent:DC:RANGe:AUTO?
[:SENSe:]FREQuency:APERture
[:SENSe:]FREQuency:APERture?
[:SENSe:]FREQuency:COUPling
[:SENSe:]FREQuency:COUPling?
[:SENSe:]FREQuency:CURRent:RANGe
[:SENSe:]FREQuency:CURRent:RANGe?
[:SENSe:]FREQuency:LEVel
[:SENSe:]FREQuency:LEVel?
[:SENSe:]FREQuency:RANGe:AUTO
[:SENSe:]FREQuency:RANGe:AUTO?
[:SENSe:]FREQuency:SOURce
[:SENSe:]FREQuency:SOURce?
[:SENSe:]FREQuency:VOLTage:RANGe
[:SENSe:]FREQuency:VOLTage:RANGe?
[:SENSe:]FRESistance:APERture
[:SENSe:]FRESistance:APERture?
[:SENSe:]FRESistance:DIGits
[:SENSe:]FRESistance:DIGits?
[:SENSe:]FRESistance:NPLCycles
[:SENSe:]FRESistance:NPLCycles?
[:SENSe:]FRESistance:POWer
[:SENSe:]FRESistance:POWer?
[:SENSe:]FRESistance:RANGe
[:SENSe:]FRESistance:RANGe?
[:SENSe:]FRESistance:RANGe:AUTO
[:SENSe:]FRESistance:RANGe:AUTO?
[:SENSe:]FRESistance:RANGe:LIMit
[:SENSe:]FRESistance:RANGe:LIMit?
[:SENSe:]FRESistance:SOURce
[:SENSe:]FRESistance:SOURce?
[:SENSe:]FRESistance:SOURce:STATe
[:SENSe:]FRESistance:SOURce:STATe?
[:SENSe:]ITEMperature?
[:SENSe:]LFREquency?
[:SENSe:]PERiod:APERture
[:SENSe:]PERiod:APERture?
[:SENSe:]PERiod:COUPling
[:SENSe:]PERiod:COUPling?
[:SENSe:]PERiod:CURRent:RANGe
[:SENSe:]PERiod:CURRent:RANGe?
[:SENSe:]PERiod:LEVel
[:SENSe:]PERiod:LEVel?
[:SENSe:]PERiod:RANGe:AUTO
[:SENSe:]PERiod:RANGe:AUTO?
[:SENSe:]PERiod:SOURce
[:SENSe:]PERiod:SOURce?
[:SENSe:]PERiod:VOLTage:RANGe
[:SENSe:]PERiod:VOLTage:RANGe?
[:SENSe:]RESistance:APERture
[:SENSe:]RESistance:APERture?
[:SENSe:]RESistance:DIGits
[:SENSe:]RESistance:DIGits?
[:SENSe:]RESistance:NPLCycles
[:SENSe:]RESistance:NPLCycles?
[:SENSe:]RESistance:OCOMpensated
[:SENSe:]RESistance:OCOMpensated?
[:SENSe:]RESistance:POWer
[:SENSe:]RESistance:POWer?
[:SENSe:]RESistance:PROTection
[:SENSe:]RESistance:PROTection?
[:SENSe:]RESistance:RANGe
[:SENSe:]RESistance:RANGe?
[:SENSe:]RESistance:RANGe:AUTO
[:SENSe:]RESistance:RANGe:AUTO?
[:SENSe:]RESistance:RANGe:LIMit
[:SENSe:]RESistance:RANGe:LIMit?
[:SENSe:]VOLTage:AC:APERture
[:SENSe:]VOLTage:AC:APERture?
[:SENSe:]VOLTage:AC:COUPling
[:SENSe:]VOLTage:AC:COUPling?
[:SENSe:]VOLTage:AC:DIGits
[:SENSe:]VOLTage:AC:DIGits?
[:SENSe:]VOLTage:AC:FILTer
[:SENSe:]VOLTage:AC:FILTer?
[:SENSe:]VOLTage:AC:NPLCycles
[:SENSe:]VOLTage:AC:NPLCycles?
[:SENSe:]VOLTage:AC:RANGe
[:SENSe:]VOLTage:AC:RANGe?
[:SENSe:]VOLTage:AC:RANGe:AUTO
[:SENSe:]VOLTage:AC:RANGe:AUTO?
[:SENSe:]VOLTage:AC:SUBMeasure
[:SENSe:]VOLTage:AC:SUBMeasure?
[:SENSe:]VOLTage:AC:SUBMeasure:STATe
[:SENSe:]VOLTage:AC:SUBMeasure:STATe?
[:SENSe:]VOLTage:DC:APERture
[:SENSe:]VOLTage:DC:APERture?
[:SENSe:]VOLTage:DC:DIGits
[:SENSe:]VOLTage:DC:DIGits?
[:SENSe:]VOLTage:DC:NPLCycles
[:SENSe:]VOLTage:DC:NPLCycles?
[:SENSe:]VOLTage:DC:PROTection
[:SENSe:]VOLTage:DC:PROTection?
[:SENSe:]VOLTage:DC:RANGe
[:SENSe:]VOLTage:DC:RANGe?
[:SENSe:]VOLTage:DC:RANGe:AUTO
[:SENSe:]VOLTage:DC:RANGe:AUTO?
[:SENSe:]VOLTage:DC:RATio
[:SENSe:]VOLTage:DC:RATio?
[:SENSe:]ZERO:AUTO
[:SENSe:]ZERO:AUTO?
*SRE
*SRE?
:STATus:MEASurement:ENABle
:STATus:MEASurement:ENABle?
:STATus:MEASurement:EVENt?
:STATus:OPERation:ENABle
:STATus:OPERation:ENABle?
:STATus:OPERation:EVENt?
:STATus:PRESet
:STATus:QUEStionable:ENABle
:STATus:QUEStionable:ENABle?
:STATus:QUEStionable:EVENt?
:STATus:QUEue:CLEar
*STB?
:SYSTem:BEEPer:STATe
:SYSTem:BEEPer:STATe?
:SYSTem:DATE
:SYSTem:DATE?
:SYSTem:ERRor?
:SYSTem:GPIB:DELImiter:BLOCk
:SYSTem:GPIB:DELImiter:BLOCk?
:SYSTem:GPIB:DELImiter:STRing
:SYSTem:GPIB:DELImiter:STRing?
:SYSTem:TIME
:SYSTem:TIME?
:SYSTem:VERSion?
:TRACe:BCONtrol
:TRACe:BCONtrol?
:TRACe:BCONtrol:PRETrigger
:TRACe:BCONtrol:PRETrigger?
:TRACe:CLEar
:TRACe:DATA?
:TRACe:DATA:NUMBer?
:TRACe:DATA:POINts?
:TRACe:FAST:DATA?
:TRACe:FAST:GAIN?
:TRACe:FAST:ZERO?
:TRACe:NUMBer
:TRACe:NUMBer?
:TRACe:POINts
:TRACe:POINts?
:TRACe:STATe
:TRACe:STATe?
*TRG
:TRIGger:COMPlete
:TRIGger:COMPlete?
:TRIGger:COUNt
:TRIGger:COUNt?
:TRIGger:DELay
:TRIGger:DELay?
:TRIGger:PASS
:TRIGger:PASS?
:TRIGger:SOURce
:TRIGger:SOURce?
:TRIGger:SOURce:TIMer
:TRIGger:SOURce:TIMer?
*TST?
:TSYStem:EXTernal:SLOPe
:TSYStem:EXTernal:SLOPe?
:TSYStem:FAST:RATE
:TSYStem:FAST:RATE?
:TSYStem:FAST:STATe
:TSYStem:FAST:STATe?
:TSYStem:LAYer:DISPlay
:TSYStem:LAYer:DISPlay?
:TSYStem:LEVel
:TSYStem:LEVel?
:TSYStem:LEVel:SLOPe
:TSYStem:LEVel:SLOPe?
*WAI
:WR {#TRG;|#RST;|#RDT;|<packet>|#H<hex_packet>}
We have some first data of different units:
branadic R6581:
0 +1.20000000E-06, 1 +1.20000000E-06, 2 +5.00000000E-07, 3 -8.00000000E-07, 4 -2.10000000E-06, 5 +1.00000000E-05, 6 +4.00000000E-05, 7 +3.00000000E-05, 8 +1.00000000E-05, 9 +1.00000000E-05,10 +2.00000000E-07,11 -2.00000000E-07,12 -1.90000000E-07,13 -4.00000000E-07,14 -4.00000000E-07,15 +1.00000170E+00,16 +1.00000590E+00,17 +1.00000200E+00,18 +9.99991500E-01,19 +1.00000360E+00,20 +1.00000370E+00,21 +1.00000350E+00,22 +1.00002500E+00,23 +9.98850000E-01,24 +9.96000000E-01,25 1999/10/16 11:49
martin unit1 R6581:
0 +1.20000000E-06, 1 +1.20000000E-06, 2 +5.00000000E-07, 3 -8.00000000E-07, 4 -2.10000000E-06, 5 +1.00000000E-05, 6 +4.00000000E-05, 7 +3.00000000E-05, 8 +1.00000000E-05, 9 +1.00000000E-05,10 +2.00000000E-07,11 -2.00000000E-07,12 -1.90000000E-07,13 -4.00000000E-07,14 -4.00000000E-07,15 +1.00000060E+00,16 +1.00000020E+00,17 +1.00000000E+00,18 +9.99998000E-01,19 +1.00000250E+00,20 +9.99997000E-01,21 +1.00000320E+00,22 +1.00003500E+00,23 +9.99350000E-01,24 +9.98000000E-01,25 1999/07/07 11:11
martin unit2 R6581:
0 +1.20000000E-06, 1 +1.20000000E-06, 2 +5.00000000E-07, 3 -8.00000000E-07, 4 -2.10000000E-06, 5 +1.00000000E-05, 6 +4.00000000E-05, 7 +3.00000000E-05, 8 +1.00000000E-05, 9 +1.00000000E-05,10 +2.00000000E-07,11 -2.00000000E-07,12 -1.90000000E-07,13 -4.00000000E-07,14 -4.00000000E-07,15 +1.00000108E+00,16 +9.99999900E-01,17 +1.00000000E+00,18 +9.99999000E-01,19 +1.00000300E+00,20 +1.00000530E+00,21 +1.00000340E+00,22 +1.00001000E+00,23 +9.99440000E-01,24 +9.96300000E-01,25 2002/10/16 15:42
martin unit3 R6581T:
0 +1.20000000E-06, 1 +1.20000000E-06, 2 +5.00000000E-07, 3 -8.00000000E-07, 4 -2.10000000E-06, 5 +1.00000000E-05, 6 +4.00000000E-05, 7 +3.00000000E-05, 8 +1.00000000E-05, 9 +1.00000000E-05,10 +2.00000000E-07,11 -2.00000000E-07,12 -1.90000000E-07,13 -4.00000000E-07,14 -4.00000000E-07,15 +1.00000110E+00,16 +1.00000300E+00,17 +1.00000700E+00,18 +1.00000200E+00,19 +1.00000450E+00,20 +1.00000700E+00,21 +1.00000200E+00,22 +1.00003000E+00,23 +9.99500000E-01,24 +9.98000000E-01,25 2004/01/27 13:00
Looking at the first 0 ... 14 constants they are all identical for the 4 units, as proposed by MickleT.
Constant 15 is different so I guess that is some factory +10V scaling constant?
-branadic-
H0 = 1.20000000E-06;
H1 = 1.20000000E-06;
H2 = 5.00000000E-07;
H3 = -8.00000000E-07;
H4 = -2.10000000E-06;
H5 = 1.00000000E-05;
H6 = 4.00000000E-05;
H7 = 3.00000000E-05;
H8 = 1.00000000E-05;
H9 = 1.00000000E-05;
H10= 2.00000000E-07;
H11=-2.00000000E-07;
H12=-1.90000000E-07;
H13=-4.00000000E-07;
H14=-4.00000000E-07;
H15=1.00000170;
H0 =+0.00000000E-00;
H1 =+0.00000000E-00;
H2 =+0.00000000E-00;
H3 =+0.00000000E-00;
H4 =+0.00000000E-00;
H5 =+7.40000000E-05;
H6 =+1.00000000E-04;
H7 =+9.00000000E-05;
H8 =+7.00000000E-05;
H9 =+7.00000000E-05;
H10=-1.00000000E-06;
H11=-2.90000000E-06;
H12=+5.00000000E-07;
H13=-6.00000000E-07;
H14=+5.00000000E-07;
H15=+1.00000170;
Anybody has the file CommandMatrix_R6581.pdf ?
The link https://www.adcmt.com/techinfo/product/end_of_sale/pdf/CommandMatrix_R6581.pdf (https://www.adcmt.com/techinfo/product/end_of_sale/pdf/CommandMatrix_R6581.pdf) doesn't work anymore and I can't find the file in archive.org :-\
That pdf is the correct one? It's just the chapter 9 ripped from the user manual.
+220, "A/D check1 error"+220, "A/D check1 error" means inconsistent charging and discharging timings of the integrator by standard current sources.
...
When running the diag procedure on boot I get weird values for the INTERNAL readout:
- x1Zero_01 : -0.02xx V
- x1Zero_02 : 2.9485xxx V
- x10Zero : 294.76xxx mV
- x100Zero : 29.47xxx mV
- 7.2Vref : 10.02929xx V
- -10Vref : -6.88504xx V
- -1Vref : -687.893xx mV
- -0.1Vref : -68.82xxx mV
- Int_temp : ~65 C - Seems correct, responded appropriately to external heating
...
..., the R6581 is protected by a series of 4 x 22K resistor and not 2.2K like the R6581T ?Yes, it's a chain of 4 blocks of 4 22k resistors in parallel. I think that this modification of the protection circuits appeared later, due to the frequent failure of devices at the time of switching the DCV range.
..., the R6581 is protected by a series of 4 x 22K resistor and not 2.2K like the R6581T ?Yes, it's a chain of 4 blocks of 4 22k resistors in parallel. I think that this modification of the protection circuits appeared later, due to the frequent failure of devices at the time of switching the DCV range.
Since the R6581T was designed as a system voltmeter for calibrating the low-voltage analog modules of the T2000 test system, no modifications were required. Hence the voltage range of 120/300 V.
..., the R6581 is protected by a series of 4 x 22K resistor and not 2.2K like the R6581T ?Yes, it's a chain of 4 blocks of 4 22k resistors in parallel. I think that this modification of the protection circuits appeared later, due to the frequent failure of devices at the time of switching the DCV range.
Since the R6581T was designed as a system voltmeter for calibrating the low-voltage analog modules of the T2000 test system, no modifications were required. Hence the voltage range of 120/300 V.
Or they spec a lower limit, similar to 6581T
I would more like consider the 1 kV rating for the early R6581 to be a dubious. So better don't use them for high voltage.
From what I was able to gather, looking at different pictures, the R6581T input is similar to original R6581. As Mickle mentioned, probably because of high failure rate :-//, they decided to do a fix and switch the resistors and added some protection on the relay (K008). Now since this is a manual fix they don't bother doing that on the R6581T.
So technically, the R6581T should be able to support 1Kv at least as good as the original R6581. That being said I would personally play safe and avoid autoranging with high voltage.
I would more like consider the 1 kV rating for the early R6581 to be a dubious. So better don't use them for high voltage.
From what I was able to gather, looking at different pictures, the R6581T input is similar to original R6581. As Mickle mentioned, probably because of high failure rate :-//, they decided to do a fix and switch the resistors and added some protection on the relay (K008). Now since this is a manual fix they don't bother doing that on the R6581T.
So technically, the R6581T should be able to support 1Kv at least as good as the original R6581. That being said I would personally play safe and avoid autoranging with high voltage.
...
When running the diag procedure on boot I get weird values for the INTERNAL readout:
- x1Zero_01 : -0.02xx V
- x1Zero_02 : 2.9485xxx V
- x10Zero : 294.76xxx mV
- x100Zero : 29.47xxx mV
- 7.2Vref : 10.02929xx V
- -10Vref : -6.88504xx V
- -1Vref : -687.893xx mV
- -0.1Vref : -68.82xxx mV
- Int_temp : ~65 C - Seems correct, responded appropriately to external heating
...
Hi Bobert,
Those values are very similar to my own R6581T. Not sure how to fix them either! I have tried a lot of physical modifications/probing that you can read about above.
Perhaps you can share your EEPROM data as described by Mickle T's 'service manual.' We might identify similarities.
We will get through this.
That is a valid possibility, but has one disadvantage that is, while you could compensate for voltage readings in the 10 V range this way things could get worse for resistance or current readings.That's true, but usually the resistance and current ranges are not that stable anyway.
-branadic-
But this would mean that no specific TC tuning was done on the HW. I would assume that it's less likely that there is a software TC tuning of a specific unit. Probably Mickle T. would have found it.I have reversed the entire R6581 firmware and can say that there is no TC software tuning in this multimeter :-\
R6581T - is a technological multimeter. It used only for ADVANTEST T2000 IC/SoC/ASIC test system, but not in metrology laboratories. R6581T don't have any official specs or manuals.
R6581T - is a technological multimeter. It used only for ADVANTEST T2000 IC/SoC/ASIC test system, but not in metrology laboratories. R6581T don't have any official specs or manuals.
Thanks! Except for different sales purposed, have anyone figured out what, if any differences there may be? Functions seems same. Could one have higher grade and tighter specification components or something?
While measuring one of my LTZ references @25°C in a thermal chamber over a longer periode with my R6581D I noticed that there is quite some t.c. visible. Therefor the internal temperature was logged together with the voltage readings. It turned out this t.c. is due to the meter itself and about 0.8ppm/K. A measurement of the t.c. of the internal reference itself revealed, that this t.c. is not due to the reference, but something else. Time to upgrade R6581!
Several improvements are documented here:
http://bbs.1ppm.cn/topic/23/advantest-6581 (http://bbs.1ppm.cn/topic/23/advantest-6581)磨机-zy的得意杰作
http://bbs.38hot.net/forum.php?mod=viewthread&tid=28698&highlight=6581 (http://bbs.38hot.net/forum.php?mod=viewthread&tid=28698&highlight=6581)
It just so happened that pipelie organized a group buy to replace R234 which boosts the zener voltage to 10V and R200 as part of the voltage to current converter.
R234 original: Alpha Electroncis SLD (7k34 X F 10k0)
R234 replacement: Vishay VHD200, hermetically sealed
R200 original: Alpha Electronics SS103F20k00 XF
R200 replacement: Vishay 300193ZT
The resistors arrived on friday so the weekend was used to replace them. Unfortunately there is no drop in replacement for R200, so the leads of the 300193ZT needs to be bend slightly into the correct position, while the VHD200 fit perfectly.
Now that the replacement is done it‘s time to let the meter settle with the new components installed, which is said to be about a month and see how this modification turns out.
Not to hide anything, removing the networks is a real pita and needs careful work and a lot of solder to heat up all pins equally. The vias are also very small and hard to clean. So unless you are well experienced in such work I would not recommend it, as you can damage a lot.
I use drill needles to finally remove last solder pieces inside the vias while heating the pad.
Also note that after that modification the meter needs calibration. To be continued ...
-branadic-
...
Thank Pipelie！Can we organize a group buy again?
...
Thank Pipelie！Can we organize a group buy again?
A group buy from Vishay got a lot more difficult. A MOQ of 25 is needed to place an order on their high end products. There might be a work around, but it's something new this year.
That said, I would be interested in a group buy myself.
Question: Do R6581 remember manual range selection after a power down?Yes it does.
2W resistance show Overload in 1000M ohm range. This seems to be what to expect, or do anyone typically see something else?It's Ok.
4W resistance is looks troublesome and broken.. 0.000000 ohm at 10 ohm range... Or is this some normal behavior?It's a normal behavior too.
QuoteQuestion: Do R6581 remember manual range selection after a power down?Yes it does.Quote2W resistance show Overload in 1000M ohm range. This seems to be what to expect, or do anyone typically see something else?It's Ok.Quote4W resistance is looks troublesome and broken.. 0.000000 ohm at 10 ohm range... Or is this some normal behavior?It's a normal behavior too.
Would anyone have 2 VFDs for the advantest available? We are working on 2 units, and they're broken