Fred,
You may have some light-sensitive components. Diodes with glass
packaging are especially bad. Try blocking the light with cardboard and
see what happens. Keep your hands away from your meters while moving
the cardboard around.
Brent
On 10/20/2012 2:47 AM, Fred Schneider wrote:
But i think I have a problem regarding magnetic fields or other sources because
I have strange issues while meauring using the 332 and KV deviders or my LM399.
I looked to it with a friend and he thinks it is some magnetic field or common
mode thing.
I had powered everything off, even the lights. Then both 7,5 digit meters
showed the same values, turning the polarity did not matter. Both KVs were
lineair upto 1 uV. Using my 399 or Fluke 332, also tested the 332 divider
dircect.
Then with the lights on severa instruments ect. A big difference if i change
polarity, both meters gave different readings, both KV dividers gave excact the
same non lineairity. I did this several days and up to about 1 mV !! between
100 mV and 10V but an verage of a few hundered mV) if I power all stuff down
exept the 332 and 7106 all is perfect again. All intruments are grounded. I use
shielded cables to the meters and from 332 to KVs from Beats me :-(
So I think your standard performs well if it is this stable while tossing
around, i wish my 332 and LM399 was that stable ( or more, the environment was
more standard friendly becaus all powered down things are much more stable)
Fred PA4TIM
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