Any circuit suggestions for a multimeter plug-in that could measure
1nA (hopeful) to a few uA ? I was thinking perhaps A -> V and
use the low DC volts range

I've got a couple of multimeters - one goes down to 20uA and the
other to 2000uA. Measuring a sleeping 12F675 gets you 00.0uA
or 0.000mA (yes, it is alive, I can wake it up to do stuff). Helpful
in the sense that it shows the battery will last a flipping long time,
but there's nothing there to hang your hat on

Googled and Googling around a bit but not too fruitful yet. Maybe
I'm not searching for the right thing, and there's such a bewildering
array of parts and technologies I might not even recognise what I
need when I see it anyway

The old NatSemi Linear Apps book has a 200pA-100uA circuit
(LB37) for the LM216A and a 100uA  moving coil meter, but the
LM216A seems to have dropped off the radar. I'm certain there
will be an equivalent or better around, but short of downloading
squillions of op amp datasheets...........

TIA

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