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Gould Oscilloscope OS1200 Sweep compression

Discussion in 'Electronic Repair' started by [email protected], Mar 29, 2007.

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  1. Guest

    (Sorry forgot the link to photos on previous message)

    I have just recently aquired a Gould OS1200 oscilloscope.

    Basically it works fine except that the Sweep trace compresses up on
    the right hand side of the when I set the timebase to 5uS and up.

    I have measured most test points on the Horizontal timebase PCB and
    cannot find anything unusual.

    Please the following example pictures showing the compresses trace.
    Also have photos showing the Sawtooth ramp generator and ramp output
    if this helps.

    I am really looking for some guidance on where I should be checking.

  2. N Cook

    N Cook Guest

    check/replace the X plate driver trannies, one is probably wonky
  3. Guest

    Have checked them and they seem OK allthough the voltage on the plates
    are a bit low.
    I have had sugestions that the problem may lay in the timing of the
    Hold off/blanking circuit.

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