Electronics > Repair
3458A
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drhex:
Then I have an issue with the box. Meh.
205, "HARDWARE FAILURE -- CAL VALUE OUT OF RANGE 101"
210, "HARDWARE FAILURE -- CALIBRATION REQUIRED"
101, "CALIBRATION ERROR"

101 is precharge DAC, assume this is A3?
drhex:
Strange thing it is working pretty well when it is just sitting there. Average drift over the last 30 days is 0.12156 in a completely temperature uncontrolled environment with TEMP? varying from 37.4 to 39.1 degrees. So good enough by KS standards.
@ianj thinks it might be a weak relay - how do I find that?
drhex:
Another interesting finding, stepping up through the ranges I get materially different indications between mA and A i.e 0.0000984 A and 0.0999915 mA for a .01 mA input from a 3245A.
IanJ:
Weak relay or iffy contacts for the issue whereby it wasn’t letting you ACAL with the bananas populated……if I read you correctly.

I’d be looking at this issue first before any drift problem.

Ian
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