Re: [volt-nuts] HP 3456A -3 Fault
Thank you Bill, I'll start looking at the power supplies. Dave - W6TE > From: wpgold3...@att.net > To: volt-nuts@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" > To: > 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@febo.com > > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts > > and follow the instructions there. > > ___ > volt-nuts mailing list -- volt-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts > and follow the instructions there. ___ volt-nuts mailing list -- volt-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts and follow the instructions there.
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" To: 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@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts > and follow the instructions there. ___ volt-nuts mailing list -- volt-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts and follow the instructions there.
[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@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts and follow the instructions there.
