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HP54645D (HP54645A) schematic

Question asked by kpe@develco.dk on Mar 19, 2009
Latest reply on May 31, 2010 by Fabien F4CTZ
Hi

I'm experiencing a problem with my HP54645D osc.
Ch. 1 suffers from a fixed offset voltage of apx. 3mV in respect to the zero marker on the CRT. (1:1 probe - shorted)
The attenuator setting does not alter the behavior. If set to 1mV/DIV, 2mV/DIV, 5mV/DIV or 10mV/DIV.
The failure is present at DC and AC input setting, but not when set to "ZERO".
The failure follows the setting of INV. (The 3mV offset is -3mV if INV is selected)

Any suggestions of what to do? Any adjustment posibillities or tips to what to look for.

Does anybody have the schematics for the HP54645D?

To moderator dnt. You have in a previous thread mentioned that you have the schematic for the HP54645A.
Is it possible to get a copy of that?

Thanks in advance - Knud  

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