Author Topic: Show your Multimeter!  (Read 328415 times)

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Offline SingedFingers

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Re: Show your Multimeter!
« Reply #775 on: March 31, 2017, 06:47:14 am »
This sounds strange but I love how ugly they are. They were instantly futurism gone terribly wrong.
 

Offline evb149

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Re: Show your Multimeter!
« Reply #776 on: March 31, 2017, 07:02:40 am »
If it works...

 

Offline Andrey_irk

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Re: Show your Multimeter!
« Reply #777 on: March 31, 2017, 04:51:09 pm »
Has anyone ever seen this one?




These units were quite popular back in the USSR. This one is still within specs.

P.S. I have access to many of different vintage soviet devices. And I can take a few photos of them if someone wants.
 
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Offline SingedFingers

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Re: Show your Multimeter!
« Reply #778 on: March 31, 2017, 05:16:53 pm »
Those are quite common in the UK. There were a lot of soviet and Eastern Bloc imports. My father had one very similar although he rarely used it.
 

Offline Andrey_irk

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Re: Show your Multimeter!
« Reply #779 on: March 31, 2017, 05:38:25 pm »
Didn't know that. Although, I saw bridges with manuals in English and a scope with front panel in French.
 

Offline Iwanushka

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Re: Show your Multimeter!
« Reply #780 on: March 31, 2017, 10:49:29 pm »
it has so called TOK symbol Star With CCCP which means it was made for export or "military use" these don't break like the ones without that symbol...

Edit: somewhere I have a better CCCP DMM I will post a photo when I have time to unload lots of crap to access it
« Last Edit: March 31, 2017, 10:51:48 pm by Iwanushka »
When all you've got is a hammer, everything starts looking like a nail.- Attrition.
 

Offline Martin.M

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Re: Show your Multimeter!
« Reply #781 on: April 01, 2017, 02:13:51 am »
I've been after one of those Philips handheld units for a while. Never seem to turn up in the UK.
This series does turn up on ebay Germany from time to time.
Sometimes in really good conditions for a good price too.
http://www.ebay.de/itm/PM2517X-PM-2517X-Philips-Labor-Multimeter-/122416300981?hash=item1c809483b5:g:n1AAAOSw4CFY19Uj

We used them in the University and it was like the ultimate handheld multimeter of its time.

Please remember:

a PM2517-X is the LCD-Type (energy saver...)
a PM2517-E is the LED Type (more cute and more hungry, but it have a plug for AC Adaptor also  ^-^ )

the Philips catalog was asking für 600,- DM. they was expensive.
There is a optional temperature probe, mostly you find PM2517 without that.

greetings
Martin
« Last Edit: April 01, 2017, 02:19:16 am by Martin.M »
 

Offline SingedFingers

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Re: Show your Multimeter!
« Reply #782 on: April 01, 2017, 03:53:47 am »
Wonder if it's the same probe that is used with my PM2524.

Got to be honest, but I prefer an LCD based meter. I've got two Thurlby PL310 power supplies and when it gets a bit dark in the evening, they burn my eyes out.
 

Offline tooki

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Re: Show your Multimeter!
« Reply #783 on: April 01, 2017, 07:17:43 am »
If it works...

Thermal RMS? Do you know anything about that, how it works?
 

Offline pelule

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Re: Show your Multimeter!
« Reply #784 on: April 01, 2017, 07:47:19 am »
The AC signal heats up a resistor for a certain tim. Then a DC voltage is connected instead to the same resistor, which creates the same amount of heat. The DC voltage is displayed as RMS value.
Basic physics. The riesistor sensor component is the critical element for the potential error.
Same method is used in the HP3400A.
Advantage: able to measure AC signal with high frequency and high crest factor.
Disadvantage: expensive and slow.
For a detailed description google for the Fluke 8506A manual. There is a detailed description of the operation.
Also here in eevblog there find a some thread for this method.
/pelule
You will learn something new every single day
 
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Offline VK5RC

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Re: Show your Multimeter!
« Reply #785 on: April 01, 2017, 09:46:07 pm »
Sounds the same principle as "thermistor' type RF power meters e.g. HP 432 and 8478. From an RF viewpoint allows nice/easy calibration at DC.
Rob
Whoah! Watch where that landed we might need it later.
 

Offline AF6LJ

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Re: Show your Multimeter!
« Reply #786 on: April 01, 2017, 11:00:38 pm »
Has anyone ever seen this one?




These units were quite popular back in the USSR. This one is still within specs.

P.S. I have access to many of different vintage soviet devices. And I can take a few photos of them if someone wants.
That is very cool; we don't get to see much Russian test gear here in the west.
Sue AF6LJ
Test Equipment Addict, And Proud Of It.
 

Offline Martin.M

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Re: Show your Multimeter!
« Reply #787 on: April 02, 2017, 12:43:58 am »
Sue, the most russian test gear we see here is ready to fight  :-/O

 

Offline Andrey_irk

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Re: Show your Multimeter!
« Reply #788 on: April 02, 2017, 01:23:01 am »
OK. Since we have a scope on this topic already, I'll show you something more interesting.
This scope I use at home. It's called C1-117. I saved it from a total destruction, because it has a lot of gold and other precious metals inside, so people just destroy them to take it especially if it doesn't work.
Although, the bandwidth is not very high (15MHz) notice the vertical scale of 0.1mV/div! Also it has cursors, which is uncommon among soviet scopes.
And it is quite compact in comparison with other analog scopes.
« Last Edit: April 02, 2017, 01:26:30 am by Andrey_irk »
 
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Offline Andrey_irk

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Re: Show your Multimeter!
« Reply #789 on: April 02, 2017, 01:28:22 am »
Sue, the most russian test gear we see here is ready to fight  :-/O



Is it the heritage of Soviet Army? Where did you get it?
 

Offline Harb

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Re: Show your Multimeter!
« Reply #790 on: April 02, 2017, 01:32:05 am »
The AC signal heats up a resistor for a certain tim. Then a DC voltage is connected instead to the same resistor, which creates the same amount of heat. The DC voltage is displayed as RMS value.
Basic physics. The riesistor sensor component is the critical element for the potential error.
Same method is used in the HP3400A.
Advantage: able to measure AC signal with high frequency and high crest factor.
Disadvantage: expensive and slow.
For a detailed description google for the Fluke 8506A manual. There is a detailed description of the operation.
Also here in eevblog there find a some thread for this method.
/pelule

They are pretty simple in their operation....

To much voltage in and they catch fire (AKA Thermal), hence Rooted Meters Suck
 

Offline JustSquareEnough

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Re: Show your Multimeter!
« Reply #791 on: April 02, 2017, 07:37:04 am »
Here is my collection of multimeters,



Nice! do you have a reference to the case's you are using for test lead storage?

--David

hobbyist of electronics, woodworking, rocketry and other cool stuff. www.davidharms.me
 

Offline Iwanushka

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Re: Show your Multimeter!
« Reply #792 on: April 02, 2017, 07:58:40 am »
Sue, the most russian test gear we see here is ready to fight  :-/O



Is it the heritage of Soviet Army? Where did you get it?

By the markings looks like it was used either in factories that made military stuff or it was used by military itself.

Edit: I've seen some of these in factory that made night vision gear, but factory was looted in a few minutes after it closed ;(
« Last Edit: April 02, 2017, 08:00:26 am by Iwanushka »
When all you've got is a hammer, everything starts looking like a nail.- Attrition.
 

Offline Martin.M

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Re: Show your Multimeter!
« Reply #793 on: April 03, 2017, 12:52:34 am »
maybe you can help me to repair this little scope,
I think there is one of the early smd IC defekt, and I don`t know where I can get them.
They do simply functions, relatives of TTL, or a 5 transistor array. When switching ON it make one way from left to right, then stop.
seems to be the trigger or like that.

greetings
Martin
 

Offline Iwanushka

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Re: Show your Multimeter!
« Reply #794 on: April 08, 2017, 08:41:22 am »
maybe you can help me to repair this little scope,
I think there is one of the early smd IC defekt, and I don`t know where I can get them.
They do simply functions, relatives of TTL, or a 5 transistor array. When switching ON it make one way from left to right, then stop.
seems to be the trigger or like that.

greetings
Martin

Hey Martin,

Sorry for the delay, could you send me a photo of the IC and part number, I will ask around @ local forums and guys who repair CCCP scopes, but if this scope is full of gold it might be hard to get it, most of scopes that had nothing but gold inside were ripped apart by gold diggers, also I will try to find the datasheet, then maybe you can make something up from current parts.
When all you've got is a hammer, everything starts looking like a nail.- Attrition.
 

Offline Neomys Sapiens

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Re: Show your Multimeter!
« Reply #795 on: April 22, 2017, 08:04:01 am »
No, I'm not going to pile 'em up for a photo shoot.
Rather, I will feature some of them over the next weeks, which have some very interesting features..

But first, the (incomplete) list

Prema 6001
Schlumberger: 7151, 7045
Tektronix: TekMeter, DM501A, DM502, DMM150
Fluke: 8060, 87, 12, 79-III, 27/FM
Siemens: Multizet A1000, Multizet A1001, B1010, Multizet T, VMG1
Metrawatt/GMC: Unigor 6ep, Unigor A43, Unigor A41, Metramax12, Metravo 4E/4H/4S/4D, Metravo Elektronik, Unigor3p, Metravo3, Metratest3
Hartmann&Braun Elavi15N, Elavi5, Elavi5N, Multavi6
Simpson 467(PSM45), Beckmann DM25xL, ICE Microtest80, Soar3100, AN-USM213, AN-PSM6, HP E2377A
Neuberger PKD4 (2x)
ITT Metrix MX1200S (Clamp Multimeter)
Amprobe 37xR-A-D

Patients and those waiting to be given away are excluded

First one was a far-eastern analogue similar to the Ultron UM-204, but branded differently, if I recall it right.  Then a Metravo 2H. Then things escalated quickly.
What can I say? they tend to accumulate, and yet, many of them have quite unique features.

Missing ones: there is a extremely rare Siemens, which looks like the A1000, but is a real A/D multimeter.
Also, I'm willing to try a 867 and I will probably replace the 87 by a 289. Keithley 2001 might be next benchtop dmm. Maybe a Siemens B1023, a Metravo 2035, the RMS version of the MetraMax12 (13?), ...
Of course, the bigger Prema DMMs (5017/8017) are something that one should not chase away if it started to follow me around aaand I worked with the Analogic DP-100 a.k.a. UDL-45 and I liked it!
So, way to go.

By the way, does anyone have definitive information about the first REAL multimeter (doing U, R, and I; and at least AC/DC for voltage)? Here in Europe, the Gossen Mavometer is often quoted, but it needed attachments for every single range. The H&B Multavi HO and the Mueller&Weigert 'Metravo' (yes, it wasn't always/only used by Metrawatt; or, there is a murky connection between those two).
 

Offline Neomys Sapiens

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Re: Show your Multimeter!
« Reply #796 on: April 26, 2017, 07:26:54 am »
So, for starters, if you were to be flown to Mars (or whereever if it makes the decision irrevocable), and you could take only ONE analogue multimeter with you, which one should one choose? The UNIGOR 6e (or 6eP) of course! Combining the advantage of an analogue meter movement with the high input impedance provided by a FET chopper amplifier and sporting the widest choice of measurement ranges known to me in a multimeter, this instrument was the undisputed high-end product of Metrawatt as long as it was built. In a Bürklin catalogue from 1988 it is still listed with a price around 1300DM. 
Its measurement capabilities include capacitance, at a time when only very few DMM did this. It is made with superb workmanship and built using discrete components only. Especially formidable are the Voltage and current ranges extending down to 1mV and 1µA FSD respectively! All U, I and R ranges are class 1 (excluding frequency error at AC). Protection features are comprehensive including an automatic cutout.
 
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Offline Neomys Sapiens

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Re: Show your Multimeter!
« Reply #797 on: April 26, 2017, 07:43:32 am »
Then there is the MetraMax12, a Metrawatt (now GMC) DMM with interesting features. It allows to reduce the input impedance deliberately to 400kOhm/V, avoiding thereby a lot of false readings. Its design history dates back to the Metravo2D, which was the first of Metrawatt's 'pocketbook-sized' DMMs. But since then, autoranging, Frequency, capacitance, Min/Max and a bargraph were added over time. There is a RMS version, which is the MetraMax14. Here shown with some original accessories (the large shroud behind the 4mm connector locks onto the disk-shaped protector on the probes). Nice to have, and I take it along often (at least until I get my hands on the 14). Here it is:

 

Offline Neomys Sapiens

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Re: Show your Multimeter!
« Reply #798 on: April 26, 2017, 08:01:26 am »
And at the other end of the scale from the Unigor6e (as far as analogue multimeters are concerned), there is the ICE Microtest80. Made in Italy by ICE, whose 680E and 680R are bigger versions built to the same principle (range selection by jacks). It is about 100x90x30mm in its box and uses a single LR9 cell. And yet: AC, DC Voltage, Current and Resistance, so it is a complete multimeter! Jacks are slightly bigger than 2mm, but the 2mm plugs with spring work. And it is a convenient solution for carrying a second meter even in the compact toolkit. Voila:
 

Offline Vtile

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Re: Show your Multimeter!
« Reply #799 on: April 27, 2017, 06:49:18 am »
So, for starters, if you were to be flown to Mars (or whereever if it makes the decision irrevocable), and you could take only ONE analogue multimeter with you, which one should one choose? The UNIGOR 6e (or 6eP) of course! Combining the advantage of an analogue meter movement with the high input impedance provided by a FET chopper amplifier and sporting the widest choice of measurement ranges known to me in a multimeter, this instrument was the undisputed high-end product of Metrawatt as long as it was built. In a Bürklin catalogue from 1988 it is still listed with a price around 1300DM. 
Its measurement capabilities include capacitance, at a time when only very few DMM did this. It is made with superb workmanship and built using discrete components only. Especially formidable are the Voltage and current ranges extending down to 1mV and 1µA FSD respectively! All U, I and R ranges are class 1 (excluding frequency error at AC). Protection features are comprehensive including an automatic cutout.

I like your taste of FET-analogs. Do you have any of the accessories? Mine (Goerz Unigor6e) do have had some form of damage in the past in the needle as the red coating have partly flaked out, but still it seems to be spot on what I have been able to verify the readings with my limited equipment. Do not start to collect these high (10M+) impedance analogs.  :-+ 
« Last Edit: April 27, 2017, 06:53:00 am by Vtile »
 


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