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
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