Thanks Nigel, I'll see if I can locate the ADC/driver datasheet to follow
your suggestion (maybe Jameco or other supplier will have one available).

Fortunately, I have a couple of these instruments (thermocouple
calibrators), so I should be able to determine what the correct levels
should be.

Cheers
WB
.................

"N Cook" wrote in message
...

If you have multiplexing with numerous backplanes then it does not
take much drift in the relative voltage steps to affect the output
response as far as visibility. Suggest checking the supply to
whatever sets these multiplexed steps

Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list on
http://home.graffiti.net/diverse








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