Ed,
Nice job, please keep us posted ! Are you planning to publish some
additional data, such as a circuit diagram ? I am thinking about doing a
similar project on my Keithley 616, which currently has approximately
25fA of residual input current (the spec says it should be less than
5fA). And no amount of cleaning seems to bring it down.
I also hope a redesigned input stage using a good op-amp will have lower
offset voltage drift.
Thanks,
Joel Setton
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