Products > Test Equipment
Soviet Oscilloscopes (Made in USSR)
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cmjones01:
I became fascinated with the wonderful world of Soviet oscilloscopes when I stumbled across a set of manuals in German for the C1-122 'universal oscilloscope' a couple of years ago. It's a re-imagining of the Tektronix 7000 series using entirely Soviet parts and techniques. A couple of months back I found an actual C1-122 with an interesting set of plugins for sale locally and couldn't resist buying it.

Seeing a Tektronix 7000 series (my main lab scope is a 7904A) and its Soviet equivalent side by side is fascinating. In some respects the Soviet one is clearly a copy of the Tek. For example, the plugin connector has the same number of ways and most of the same signals in the same places. In others, it's subtly different. Said connector is 2.5mm pitch instead of 0.1". And in yet other ways the Soviet development went in its own direction: the plugins include quite a flexible tunnel diode pulser, and the later (Я4С-100 and Я4С-101) sampling plugins have digitally-operated slideback measurements.

I'm documenting as much as I have time for on TekWiki, as well as searching for interesting plugins and accessories. A full set of probes and manuals for the Я4С-97 multimeter plugin (including temperature and high voltage/EHT) came from someone in Belarus, and I have another interesting plugin on its way from a surplus dealer in Ukraine. I'd love to find the sampling head ('stroboscopic mixer') for the sampling plugins, and the Я4С-105 'measurement unit' just to find out what it actually does. Any leads would be much appreciated.

Chris
WhichEnt2:
Я4С-105 according to the 21 / 171 page of http://www.eltesta.com/Downloads/files/People.Years.Oscilloscopes.Parts%203.3,%203.4.pdf perform semiautomatic cursor measurements.
schmitt trigger:
CmJones:
fascinating finds! I'm so jealous! Good for you.

It is interesting to see that the Soviets took the time to translate the instrument's legends into German. It shows they were committed to export these units.
Wonder if they made them in other languages too.
cmjones01:

--- Quote from: WhichEnt2 on June 25, 2018, 04:09:32 pm ---Я4С-105 according to the 21 / 171 page of http://www.eltesta.com/Downloads/files/People.Years.Oscilloscopes.Parts%203.3,%203.4.pdf perform semiautomatic cursor measurements.

--- End quote ---
Yes, that's why I'm intrigued with it. It doesn't have an input on the front panel, only a calibration signal output as far as I can see. So it must get some sort of input from the mainframe. However, in the original Tektronix mainframe design, there's no way that a vertical plugin can see the signal from the other vertical plugin or the sweep from the horizontal plugin, so any kind of automated measurement would be impossible without front-panel input (like the 7D12 has). Therefore I suspect that the C1-91/115/122 mainframes have an enhanced the plugin interface to make it more flexible. I already have some evidence for this: the pairs of sampling plugins (Я4С-95/96 and Я4С-100/101) talk to each other (sending sampling pulses) through the backplane, whereas their Tektronix equivalents have separate connectors on the sides of the plugins which contact each other separately from the backplane. I've now got plugin extenders for my C1-122 so can relatively easily have a look at what's going on on the plugin interface. The manual isn't very helpful at describing the functions of the various pins.

This is the sort of thing I find really interesting. It's not that the Soviet designers just copied Tektronix. They took the 7000 series design and ran with it, introducing various changes and improvements.

Chris
MiroS:
>Yes. At least 9 plants made industrial test gear in USSR. And few "common" models was produced for schools ...
Yep, we avided them,  we tend to say - 'use  necessarily in a helmet and safety glasses'
This is not a joke.  CCCP devices  were well know to explode rapidly. Probably most fameous was TV set  called Rubin.
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