Walter Harley said:
Found an old HP 1200B scope on a junk heap. No trace. I think I'll try
to fix it up and give it to the next person who asks me what an
oscilloscope does
Does anyone have a schematic or service manual for this? Or even know
what the specs are?
Following up on my own thread (thanks to someone who responded privately):
500kHz bandwidth, 100uV/division sensitivity.
It's pretty simple inside, and like all HP gear of the era, designed to be
serviced. So it was no problem to find the open resistor in the power
supply, replace it, and I'm up and running! I was able to calibrate the
timebase and vertical gain without a manual, but I'm reluctant to do
anything to the attenuator compensation, etc. - basically, anything
involving a trimmer cap. But it's in pretty good shape even without that.
Probably could use some contact cleaner on the selector switches. Traces
are nice bright blue.
It's an interesting instrument. Both channels have differential input, each
leg separately switchable AC/DC/off. And although bandwidth is only 500kHz,
it will go down to 5 sec/div, and phosphor persistence is long enough to
make that worthwhile. All in all, it should be a useful addition to the
stable. Maybe I won't give it away quite so soon after all