[volt-nuts] HP 3456A -3 Fault

[David Smith]

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
> 
> Dave:
> 
>     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,
> 
> Bill
> 
> ----- 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
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