[volt-nuts] HP 3456A -3 Fault

David Smith w6te at msn.com
Fri Dec 26 18:34:14 EST 2014

Hello Friends,
I have two HP 3456A's that have the same "-3" fault in the "test" mode. Both DVM's started exhibiting this same fault about the same time. I've troubleshot one of the DVM's to a failure in the Isolation Logic "Transmitter." I have no waveform at the output of A3T1.
Before I continue with troubleshooting I thought I'd ask a question of the group.  Is there a common mode failure of these DVM? Is there something in particular or area that I should be looking at/for?
It's probably coincidental that they would both fail at about the same time with the same -3 fault.
Your input is greatly appreciated.
Best regards,

Dave - W6TE 		 	   		  

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