> 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


If you want to specifically measure a uPs sleep current or similar you can
cheat and power it from a small cap at a known voltage.
First use a voltmeter to measure the cap voltage and watch what it does with
time with the meter only as load.
Now add the uP load and note the difference. Mr Coulomb will allow you to
decide what current is drawn.

    RM

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