I have an 8405a with a bad probe. The unit makes it through most of the
calibration until the noise cancellation step. One board works and comes
in at less then 5 mv. However one shows a 1V peak to peak distorted sine
like wave. This probe actually works, however due to the fault it has a
phase frequency error. This error is of course disaster for a phase meter.
Does anyone have experience in diagnosing these probes?
Does anyone have a lead as to what part to suspect?
Thanks - Dan
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