Author Topic: Restoration glory of Keithley 2001 DMM  (Read 209671 times)

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Offline wertyq

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Re: Restoration glory of Keithley 2001 DMM
« Reply #275 on: April 15, 2015, 03:31:29 pm »
I have adc modules for those things...
 

Offline TiN

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Re: Restoration glory of Keithley 2001 DMM
« Reply #276 on: April 17, 2015, 11:16:13 am »
wertyq
No, you do not have. You are some wierd spambot which copy other's messages  :-//

All
That military 2001M we talked about is back for sale. I was thinking to watch it, but looking at heavy bidding 5 days before end ( :wtf: :blah:) it does not look good. So I'm out on this rare -M version with all paper documentation and schematics included :)
Just a heads up who want fresh 2001 desperately (serial number is 1xxxxxx and firmware is newest we ever know, B17), so if lucky winner of this unit happen to be EEVBlogger, please do post details :)

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Offline Smith

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Re: Restoration glory of Keithley 2001 DMM
« Reply #277 on: April 17, 2015, 11:22:11 am »
Hi Smith,

I would LOVE to see more high-resolution photos of your 6517 internals. Information about electrometer insides are scarce. Maybe even A/D board if it's not same revision as one's I have (J and H).
You can upload you photos on my FTP and I would rehost on website for people repairs. Size unlimited, everything is welcome :)
Also firmware would be nice to dump, if you have tool to read ROMs. We have only A10, A12 and A13 and it's only for 6517B.

I have uploaded some pictures and 2 firmwares for the 6517A. I realized I hadn't took a picture of the ADC board itself. As far as I can remember it was one of the revisions you posted on the first page of this topic. BTW, in the overview of the Keithley documents there is a 6517, 6517A and 6516B. I think the last one was a typo.

BTW, do you know how to flash the name.x file on the two EPROMS?
Trying is the first step towards failure
 

Offline TiN

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Re: Restoration glory of Keithley 2001 DMM
« Reply #278 on: April 17, 2015, 11:33:30 am »
Yes, that's for sure typo, thanks.

As of .x files, these are motorola format. It's easy to convert into hex or binary, I use WinHEX for that for example.

But your firmware seem to be too small (in both 6517A_C03_ODD.bin and 6517C05.x files), should be same same as EVEN one.
Can you check?
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Offline Smith

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Re: Restoration glory of Keithley 2001 DMM
« Reply #279 on: April 17, 2015, 12:07:54 pm »
You where right, something went wrong in the mail. I've uploaded them again and they should be OK.
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Offline TiN

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Re: Restoration glory of Keithley 2001 DMM
« Reply #280 on: April 28, 2015, 12:40:56 pm »
You still did not replace caps on your Keithley 2001?
Merphy's going to you...

Calibrated 2001 died, hangs often and "No Comm Link" ...

Here's what waiting inside, little 1000uF bastards did some peepee ...




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Offline ManateeMafia

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Re: Restoration glory of Keithley 2001 DMM
« Reply #281 on: April 28, 2015, 01:11:56 pm »
I feel better now. I just placed an order yesterday for a bunch of those caps. I wasn't sure if it would be worth the extra effort.

I have also been replacing the power entry module. It is not made by Schaffner, but with all the other caps going bad I thought why take the chance? Mouser has them in single unit quantities.

My Tektronix order is coming in today so I should be reassembling the second 2001 awaiting the additional caps. I will let you know how that DS1248Y works out in the 2002. The front / rear switch in the 2002 will also have to be replaced since it won't lock. The order has some spare switches and at $11 they were relatively inexpensive.

 

Offline ManateeMafia

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Re: Restoration glory of Keithley 2001 DMM
« Reply #282 on: April 28, 2015, 01:27:50 pm »
TiN,

Was that the meter that was 'singing' during the EZGPIB script? I hope I didn't add to the death of those caps. I have been testing a new script but still have a few tweaks to make.
 

Offline macboy

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Re: Restoration glory of Keithley 2001 DMM
« Reply #283 on: April 28, 2015, 02:21:28 pm »
TiN,

Was that the meter that was 'singing' during the EZGPIB script? I hope I didn't add to the death of those caps. I have been testing a new script but still have a few tweaks to make.
If it was related, then I would think that the "singing" was a side effect of the caps dieing, not the cause of their death.
 

Offline ManateeMafia

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Re: Restoration glory of Keithley 2001 DMM
« Reply #284 on: April 28, 2015, 03:25:18 pm »
I know, it just reminds me of the Apple II urban myth that it supposedly could be killed with a single POKE command. Not that I remember what an Apple II actually is...
 

Offline TiN

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Re: Restoration glory of Keithley 2001 DMM
« Reply #285 on: April 28, 2015, 03:56:11 pm »
Yes, it was a "singer".
Just sad that I spend evening yesterday replacing caps, cleaning board, desoldering VFD DC-DC (ERG E705-E905VF) , soldering it back, as it's still a dud.  :rant:
5VDC voltage is fine, reset is fine.

Here are some more photos during yesterday service:



I removed all parts around caps, tried clean PCB with acetone, and I thought silkscreen mask got dissolved by acetone. That never happen before.
Then tried some other area's of PCB with acetone, nop, silkscreen mask intact. So that was not acetone, but aggressive electrolyte from caps, evil enough to dissolve silkscreens and solder mask!



After replacement :



Did that because donor board had missing U622 GPIB chip and U621,U623 buffers and firmware PLCC32 ROM chip. Well, now I have those chips, desoldered them from my poor 7001 (again), and will use firmware ROM from problem board now.
« Last Edit: April 28, 2015, 03:58:13 pm by TiN »
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Offline TiN

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Re: Restoration glory of Keithley 2001 DMM
« Reply #286 on: April 28, 2015, 06:22:43 pm »
GPIB interface chip ready to solder on digital board. This one come from 7001 switch.



GPIB transceivers ready to be soldered... This one come from 7001 switch too.



Fixed board back in unit



Working just fine after copy calibration ROM contents from old board. 19K000 0.005% VPG resistor measurement.



Funny note , it still have high-pitch noise, I guess it's from display DC-DC (as I moved it to new board) and noise frequency changes when display show different information.
« Last Edit: April 28, 2015, 06:35:59 pm by TiN »
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Offline macboy

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Re: Restoration glory of Keithley 2001 DMM
« Reply #287 on: April 28, 2015, 07:28:19 pm »
In the photo of the repaired digital board, you have the memory jumper in "STD" position, but you have DS1245Y installed. I guess that you forgot to switch to "OPT" position.
 

Offline TiN

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Re: Restoration glory of Keithley 2001 DMM
« Reply #288 on: April 29, 2015, 03:50:36 pm »
I thought noone opens full resolution photos  ;D
Good catch.
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Offline TiN

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Re: Restoration glory of Keithley 2001 DMM
« Reply #289 on: May 05, 2015, 06:53:14 pm »
How are our DMM restoration goes?
Anyone interested in calibration howto video? Recorded some footage during calibration of third repaired 2001.
End result (measuring 2V from EDC MV106):

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Offline VintageNut

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Re: Restoration glory of Keithley 2001 DMM
« Reply #290 on: May 16, 2015, 09:27:55 pm »
Those are the days I think we can conquer the world guys! Still can't believe the FULL schematics are now in our hands  :-+.

Nice job TiN and macboy.

From my side I am still hunting the 1801 preamp, but I think it is official and extinct animal. Surely somewhere it is just sleeping in some dusty big company lab corners (:palm:).
Worth to try with the Keithley forum brothers (as it happen here), and why not ask there for the B16 FW? I can do it if nobody already tried that.

My 2001 unit is still sailing the ocean finding his way from Canada to Germany....

Quote
'Grandpa, were you a hero in the war?' Grandpa said 'No... but I served in a company of heroes.'

I recently used an 1801 with a 2001. The stability/drift is less than 1nV. It is truly a gem of an instrument. It is obsolete but I believe that it was built in England by EM Electronics. Here is a link to a free-standing nV amplifier from EM http://www.emelectronics.co.uk/spec/A10.html

For the budget minded, I recommend finding a model 147. I have bought two model 147 and one model 148 from eBay. I have used a working 147 to measure a 5 nano-ohm resistance standard. Just source +1A and then -1A and calculate the slope R = (V1-V2)/(I1-I2). Using +/- 5A is easier but I don't have a 5A sourcemeter handy.

working instruments :Keithley 260,261,2750,7708, 2000 (calibrated), 2015, 236, 237, 238, 147, 220,  Rigol DG1032  PAR Model 128 Lock-In amplifier, Fluke 332A, Gen Res 4107 KVD, 4107D KVD, Fluke 731B X2 (calibrated), Fluke 5450A (calibrated)
 

Offline TiN

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Re: Restoration glory of Keithley 2001 DMM
« Reply #291 on: May 17, 2015, 12:59:43 am »
If you have possibility, some internal photo of 1801 would be really appreciated.
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Offline VintageNut

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Re: Restoration glory of Keithley 2001 DMM
« Reply #292 on: May 17, 2015, 01:03:59 am »
Sorry, no internal photos. The 1801 and 2001 belongs to my employer and I was not free to take the cover off.
working instruments :Keithley 260,261,2750,7708, 2000 (calibrated), 2015, 236, 237, 238, 147, 220,  Rigol DG1032  PAR Model 128 Lock-In amplifier, Fluke 332A, Gen Res 4107 KVD, 4107D KVD, Fluke 731B X2 (calibrated), Fluke 5450A (calibrated)
 

Offline ManateeMafia

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Re: Restoration glory of Keithley 2001 DMM
« Reply #293 on: May 17, 2015, 03:12:32 am »
TiN,

I would be interested in any calibration videos you have made. The 2001 and 2400 would be helpful as I plan on doing mine (hopefully) by next weekend.
 

Online Theboel

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Re: Restoration glory of Keithley 2001 DMM
« Reply #294 on: May 17, 2015, 03:58:13 am »
Hi Tin,

Even I don't have any keithley yet the calibration video is interesting specially 2001

Thank You
 

Offline Zucca

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Re: Restoration glory of Keithley 2001 DMM
« Reply #295 on: May 20, 2015, 09:32:33 am »
Sorry, no internal photos. The 1801 and 2001 belongs to my employer and I was not free to take the cover off.

[fun] Just PM me the address and my Italian friends will do the job... [/fun]
What a pity! I definitely gave up with the hunt. In Europe and in USA the K 1801 is no more available, it is just an old ghost. Thanks a lot for the EM A10 hint, I think we are on  a very promising path.
EDIT:
Check this out:

EM Amplifier Utility Board UBc with Passive Filter
EM Amplifier Utility Board UBb with Active Filter

@Group: Sorry for not posting anything in the last month. I was busy. BTW my K 2001 is now here. It was owned by a Canadian winemaker and it was use to control the wine temperature!
I open it up and found some interesting (no sense?) stuff (according to my poor brain), I will post details soon. 
« Last Edit: May 20, 2015, 10:29:13 am by zucca »
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Can't love what you don't know. Zucca
 

Offline TiN

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Re: Restoration glory of Keithley 2001 DMM
« Reply #296 on: May 20, 2015, 11:56:21 am »
Welcome back :) Same story here, just mess with 2000 and 2002 a little last week. Busy upgrading my server lately.

Take some nice photos, we will clarify all non-sense stuff in it :)
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Offline timb

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Re: Restoration glory of Keithley 2001 DMM
« Reply #297 on: May 20, 2015, 11:12:49 pm »
Hey guys, I mentioned on here sometime last fall about needing a replacement white amps/fuse jack for my 2000. Someone mentioned having one, but I can't find the post now. :-(

If anyone has one I'd be grateful!

If also be interested in an entire non-yellowed front panel (just the plastic, doesn't have to include the display, etc.) in good condition, as mine has turned "vintage PC plastic yellow". I guess Keithley must have used bromine as a flame retardant?


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Offline eas

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Re: Restoration glory of Keithley 2001 DMM
« Reply #298 on: May 21, 2015, 05:12:03 am »
So, did one of you get the non-working 2001 on ebay for ~$205 today? I was planning to try and do a last minute bid on it in the 5 minutes between the end of an appointment and the end of the auction. My appointment ran long... :-[
 

Offline VintageNut

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Re: Restoration glory of Keithley 2001 DMM
« Reply #299 on: May 21, 2015, 05:57:45 pm »
So, did one of you get the non-working 2001 on ebay for ~$205 today? I was planning to try and do a last minute bid on it in the 5 minutes between the end of an appointment and the end of the auction. My appointment ran long... :-[

I bid on it at the end but was outbid. Not disappointed. I bought an as-is 2001 for $395 from a test equipment broker. It is supposed to arrive today. I will post pictures and results of the instrument's condition and behavior.

I did receive a 7001 today. Dim low display but it works. Paid $92.00 shipped. Inside looks pristine. Outside is scratched up but no dents or out-of-square bending. Cover comes off easily. Chips are dated 4299 so I guess this is year 2000 instrument.
working instruments :Keithley 260,261,2750,7708, 2000 (calibrated), 2015, 236, 237, 238, 147, 220,  Rigol DG1032  PAR Model 128 Lock-In amplifier, Fluke 332A, Gen Res 4107 KVD, 4107D KVD, Fluke 731B X2 (calibrated), Fluke 5450A (calibrated)
 


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