Randy wrote:
but I recently noticed the meter reads -0.08 when the
input is open on the 1V range and the null switch is on 0.0001
This equates to a -8uV reading.
I believe this is due to the input bias current of the LTC1050
* * *
However, this would imply an 8pA bias current,
which is much higher than expected.
I am attaching the relevant portion of the LTC1050 datasheet. Note that
at 25C, the 1050 has an input offset current spec of +/- 20pA (both
typical -- max is ~5x worse). I would expect a total input offset of
+/- 20uV (typical) in your circuit. (The 0.5uV typical input offset
voltage is not a significant contributor in this context.)
Best regards
Charles
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