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Probes for DuMont Oscillograph Model 292

Discussion in 'Electronic Repair' started by Rob, Nov 9, 2007.

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  1. Rob

    Rob Guest

    I'll be installing replacement caps for the CRT deflector plates this
    weekend and firing it up for testing. The probe connections on this
    unit are standard banana type, like for typical multi-meters. Will my
    multi-meter probes be good enough, or is there a special type of probe
    that is needed? Any suggestions on what to measure (ie household
    current) for a quick test? Unit does power up, but had problems
    centering the trace...
  2. hr(bob)

    hr(bob) Guest

    Regular bananna plug/jacks should be ok as long as you are not
    measuring voltages high enough to break donw the connectors, and that
    doesn't seem likely.
  3. Guest

    Don't know what Vin(max) would be for this scope, but I wouldn't
    recommend 117V. Try a convenient wall wart, or spare doorbell
    transformer. Using coax rather than multimeter probes would be
    more accurate for higher frequencies.

  4. With banana jacks standard, I doubt this thing has a bandwidth more than
    100 kHz, maybe less.

    Once you get tire of looking at 60 Hz AC, try the output of an audio
    system (walkman, CD player, etc.). I wouldn't risk an Ipod until you
    know it isn't going to zap it though! :)

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