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Can't fully compensate probe on my T935

Discussion in 'General Electronics Chat' started by woodworkerjb, Mar 20, 2012.

  1. woodworkerjb

    Thread Starter New Member

    Mar 20, 2012
    I am completely new to using an oscilloscope. I just bought an old tektronix
    T935. When going through the manual for setup I came to the part for compensating the probe and I am not able to fully compensate. In fact even if I turn the adjustment screw all the way it will not ever over compensate. The probe is an HP 10:1 10M ohm/15pf -1Mohm 9-17pF input. Is this a matter of an incompatible probe, a faulty probe, a faulty oscilloscope or a nit wit operator?

  2. Ron H

    AAC Fanatic!

    Apr 14, 2005
    The manual for the T935 says the input capacitance is 30pF. If your probe will only compensate up to 17pF, that is your problem. You need a different probe.
    woodworkerjb likes this.