Randy,
8pA is quite good a leakage / bias current for such a differential VM,
and also for the LT1050.
What makes me wonder, why three different OpAmps should all have exactly
-8pA.
The variation from one OpAmp to the others should vary greatly, even if
these are from the same batch.
I don't remember your circuit, but maybe you have some sort of input
protection on the non-inverting input, and that may cause this constant
bias. Have you assembled the OpAmp completely on the PCB, or is the +
input air-wired to the polarity switch S4E ? Ordinary PCB material may
also cause leakage currents.
I would also check the switches, if they are contaminated.
Frank
_______________________________________________
volt-nuts mailing list -- volt-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts
and follow the instructions there.
