[volt-nuts] HP 3456A -3 Fault
w6te at msn.com
Fri Dec 26 21:46:19 EST 2014
Thank you Bill,
I'll start looking at the power supplies.
Dave - W6TE
> From: wpgold3637 at att.net
> To: volt-nuts at febo.com
> Date: Fri, 26 Dec 2014 16:36:00 -0800
> Subject: Re: [volt-nuts] HP 3456A -3 Fault
> These things are NOTORIOUS for filter cap failures in the power
> supplies. Check both the voltages and the RIPPLE on the various power
> supplies. It is not sufficent to just check the voltages. You must check
> the ripple with an o'scope. At least this is the first step before looking
> for anything else.
> Good luck,
> ----- Original Message -----
> From: "David Smith" <w6te at msn.com>
> To: <volt-nuts at febo.com>
> Sent: Friday, December 26, 2014 3:34 PM
> Subject: [volt-nuts] HP 3456A -3 Fault
> > 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
> > _______________________________________________
> > volt-nuts mailing list -- volt-nuts at febo.com
> > To unsubscribe, go to
> > and follow the instructions there.
> volt-nuts mailing list -- volt-nuts at febo.com
> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts
> and follow the instructions there.
More information about the volt-nuts