Joel, did you let your 616 warm up for a good long time? I fired up mine
yesterday and it read over 50 fA, then increased to over 130 fA after a
while. I figured maybe there was something wrong with it - yet another
repair project. I studied the manual a bit and noticed it said that if
the 616 has not been used in a long time, that it could take very long
(unspecified) to stabilize when first put back in service. I left it
running overnight, and got around to checking it late this afternoon. It
read about +4 fA, but then I found the offset voltage had drifted up a
bit. After re-zeroing, it now drifts around between +1 and +2 fA, with
occasional jumps. This is at fairly high ambient - it's somewhere in the
80s (F) here now. So, after about a day of burn-in, it's well within
spec, and quite respectable. Later I'll try shut down and restarting
tests to see how quickly it recovers to spec with more normal use.
Maybe you should let yours cook for a while, if you haven't already,
before assessing it. Good luck.
Ed
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