Soviet Portable Scopemeter Teardown

Browsing YouTube may prove to be your largest destroyer of productive time outside of Hackaday, once you have started looking at assorted Lincolnshire plumbers or young Ukrainians doing dangerous stunts it’s easy to lose an hour with very little to show for it. There is so much to divert our attention, it’s a wonder that any of us ever make anything!

So to ensure you lose a further quarter hour today, we’d like to bring you [Jesper Broe]’s demonstration and teardown of his latest oscilloscope. This might seem unpromising when we tell you it’s a single-trace model with a bandwidth of 10MHz, but don’t give up. This is a RIMEDA C1-112, a portable instrument made in Lithuania when the country was part of the Soviet Union, and its party piece is that it contains a digital multimeter with a vector display using the oscilloscope CRT.

We’re shown the compact device being unpacked, then put through its paces as an oscilloscope. It gives useful results above 10MHz, but it is visibly losing amplitude and eventually it has trouble triggering as the frequency increases. Interestingly all the controls work in the opposite direction to the ones you will be used to, anticlockwise rotation increases rather than decreases. Then we’re shown the multimeter function, which is compared to a modern DMM and found to be still pretty accurate after nearly three decades.

The ‘scope’s lid is then removed, and we see something of the logic boards that produce the digital display. A host of Soviet K155 series logic ICs are at the heart of it, and at the end of the video we’re shown a period review in Russian with a glimpse at the waveforms they produce to vector draw the figures.

Take a look at the video below the break, we’re sure you’ll agree it’s an instrument that many of us would still find useful today.

This is the first Soviet ‘scope teardown we’ve brought you here at Hackaday, but there have been quite a few other instruments receiving the treatment. A Rigol needed a faulty encoder replacing back in 2011, while we showed you the inside of a National Instruments VirtualBench in 2015. The ultimate ‘scope teardown though is the Teledyne LeCroy Labmaster 10-100zi, a 100GHz powerhouse with a million-dollar price tag.

5 thoughts on “Soviet Portable Scopemeter Teardown

  1. In the spirit of friendly ethnic hair-splitting that seems to rear its head whenever the guys from Kreosan are mentioned even in passing, I feel obliged to mention that the young Ukrainians referred to are actually young Russians (from Ukraine) doing dangerous stunts. Yours, etc.

  2. I remember seeing a pdf of an article from ’92 from an electronics magazine (one of the two still in print) here in Poland that described this particular model, which is still quite popular on local auction sites, as is the rest of the C1 line. I have the C1-114/1 (dual channel, 50MHz) which still works, although it’s not in the best shape. As far as I know the C1 series of scopes were manufactured in Lithuania, here’s an article:

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