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HP 54501A won't calibrate.

Question asked by duodiode on Sep 20, 2011
Latest reply on Sep 26, 2011 by duodiode
Hello all,

I have just been given a 54501A CRO which requires recalibration.  It passes the self calibration fine but gets stuck on the "Logic Trigger Delay Calibration".  This is section 4-18 in the service book.  The asterix is on the extreme LHS of the field and adjusting C700 makes no difference to its position.  In this mode, there is no output from AC calibrator output.  I have performed 4-19, the "Oscillator Output Check" which it passes fine.  Any ideas as to what the problem is please?