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I have much enjoyed the recent discussion here about the 7T11/7S11/7S12
sampling plugins and have learned a lot from the contributions.

I have a long-term quest to get my Soviet Ya4S-100/Ya4S-101 sampling
plugins working properly. They're roughly equivalent to the 7T11 and 7S11
but with some neat features, most notably a delta delayed timebase and
slideback-type voltage measurement, both with digital display on the
scope's readout. The problem is that I don't have the sampling head for
them. I'm searching high and low for one (and learning quite a lot of
Russian in the process) but they're like hen's teeth and always seem to
have gone missing. The official sampling head is a dual channel feed
through sampler with SR50-262 (almost identical to 'N' type) connectors for
input and output. The good news is that the schematic is available, though
seems to have been drawn by someone whose aim was to minimise the use of
paper and ink rather than to create useful documentation.

The sampling plugin has a 19-way connector for the sampling head. This
carries +/-15V, the signal and feedback for each channel, a single strobe,
and a mysterious signal called 'threshold' which looks like a TTL logic
output which alternates state on each trigger.

The good news is that my sampling plugins seem to be working well and all
the signals on the connector do the right things, so the project is worth
pursuing. My idea is to create an adapter cable so I can use Tek S-series
sampling heads until I find the original one. I don't have any S-series
heads at the moment, only SD-22 and SD-24 ones which involve too much
software, so I'd have to buy one to try out.

I've looked at the manuals for the 7S11 and various sampling heads. Is
there a clear specification anywhere of the interface, for example the
amplitude of the strobe pulse and the signal and feedback connections? I
would be quietly amused if the Soviet system turned out to be electrically
compatible with the Tek one...

All advice and thoughts much appreciated,
Chris

Let me be heretical and suggest using an HP 1430 series head. They can be
made compatible w/ the S series but you'd have to roll-your-own interface.
They also have a very strange cable. But, it's another idea.



On Sun, May 20, 2018 at 3:53 PM, cmjones01 <chris@...> wrote:

I have much enjoyed the recent discussion here about the 7T11/7S11/7S12
sampling plugins and have learned a lot from the contributions.

I have a long-term quest to get my Soviet Ya4S-100/Ya4S-101 sampling
plugins working properly. They're roughly equivalent to the 7T11 and 7S11
but with some neat features, most notably a delta delayed timebase and
slideback-type voltage measurement, both with digital display on the
scope's readout. The problem is that I don't have the sampling head for
them. I'm searching high and low for one (and learning quite a lot of
Russian in the process) but they're like hen's teeth and always seem to
have gone missing. The official sampling head is a dual channel feed
through sampler with SR50-262 (almost identical to 'N' type) connectors for
input and output. The good news is that the schematic is available, though
seems to have been drawn by someone whose aim was to minimise the use of
paper and ink rather than to create useful documentation.