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How would you interpret this waveform?

Discussion in 'Electronic Repair' started by Mike, Mar 22, 2005.

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  1. Mike

    Mike Guest

    Repairing a BK E-200D rf signal generator. This waveform is what my
    scope is showing on the output with the internal 400hz audio signal
    applied at 50% modulation on an approx 500kHz signal. It should be a
    clean sine wave. I am new to using a scope so not sure what the
    waveform indicates, clipping? Power supply is not clean?
    Here is a jpeg - thanks for any help!
  2. CJT

    CJT Guest

    It looks like your modulating audio signal is a filtered square wave
    (or a square wave run through an amp with inadequate bandwidth).
  3. John Bachman

    John Bachman Guest

    The first thing I would check would be the power supply at the
    modulator and after. If that is solid I would then check the signal
    at the input and output of the modulation stage.

    This waveform appears to show that the modulating signal is overdriven
    somewhere, so start at the modulator input and follow the signal
    through until you see the problem.

    Good luck.

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