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need HP 1200 scope manual

Discussion in 'Electronic Equipment' started by Walter Harley, Apr 7, 2006.

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  1. 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?

  2. 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 :)
  3. Alan Douglas

    Alan Douglas Guest

    I've had a 1200 on my bench for years. It's been 100% reliable
    (good thing, since I have no manual). I use it whenever I need the
    sensitivity or when I want to remind myself how sharp a good analog
    scope trace can be.

  4. Bret Ludwig

    Bret Ludwig Guest

    You mean Donny Lancaster could be w... I mean, wr.... I mean NOT
    RIGHT when he says HP scopes are worthless and won't trigger for squat?
    DON LANCASTER, Wrong??? Say it isn't so!!!
  5. The last decent scope HP ever built was the 130-C.
    It has been downhill ever since.

    Many thanks,

    Don Lancaster voice phone: (928)428-4073
    Synergetics 3860 West First Street Box 809 Thatcher, AZ 85552
    rss: email:

    Please visit my GURU's LAIR web site at
  6. So as long as I want to trigger on the negative edge, I should be fine,
    right? ;-)
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