Well, sounds like you already prepared against some of my suggestions.
Still there are possibilities to troubleshoot it - i cannot neither see
that you checked everything I listed nor that my list is complete and
you had much bigger ideas.
The datasheet gives some figures telling how much some influences, like
R variations (and as a result I variations) get supressed on the output -
I would go hunting for nodes where the noise bursts are biggest if all
preventive actions failed. Up to a certain point, troubleshooting is fun.
Hendrik
Am 29.01.2015 18:22, schrieb Randy Evans:
The reference module is in a metal box and uses an external linear PS with
internal separate regulation. I don't think its external EMI, but anything
is possible.
Randy
On Wed, Jan 28, 2015 at 10:28 PM, Hendrik Dietrich <[email protected]> wrote:
Am 29.01.2015 04:07, schrieb Randy Evans:
I bought two HP-3458A ref boards from John Daly (he no longer has any
more)
and they worked fine but have intermittent noise bursts. I suspect they
were rejects from HP/Agilent. At some point I will probably replace the
LTZ1000As and reduce the internal temperature set point for better
stability. Has anyone else had any issues with these units?
BTW, I packaged the units in an enclosure for a stand-alone reference and,
except for the occasional noise bursts, seem very stable according to my
HP
3458A and fluke 732A/ESI RV722 KVD.
Randy
Hi Randy,
Noise bursts, especially if they get back on track again, sound like
electromagnetic interference from your short description.
If applicable, turn of the CFL or LED lighting, replace the switch-mode
power supply with a linear one or even better a battery, try a known
non-reject in place of the ebay reference module, spread some capacitors
on/around the module and/or invest in a metal box.
Hendrik
_______________________________________________
volt-nuts mailing list -- [email protected]
To unsubscribe, go to https://www.febo.com/cgi-bin/
mailman/listinfo/volt-nuts
and follow the instructions there.
_______________________________________________
volt-nuts mailing list -- [email protected]
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts
and follow the instructions there.
_______________________________________________
volt-nuts mailing list -- [email protected]
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts
and follow the instructions there.
