> And don't forget that you need a very high impedance measuring device...

Actually you don't. What is 10M or 1M in parallel with 1K....
Just about 1K.

> ----- Original Message -----
> From: "Bob Ammerman" <rammerman@ADELPHIA.NET>
> To: <PICLIST@MITVMA.MIT.EDU>
> Sent: Saturday, November 22, 2003 9:55 PM
> Subject: Re: Sensitive micro-ammeter?
>
>
> > Place a 1K resistor in series with the power supply.
> >
> > Every mV you see across that resistor corresponds to 1 uA of current.
> >
> > A 10K resistor will give you 10mV per uA
> >
> > A 100K resistor will give you 100mV per uA
> >
> > Of course, you must be aware of the reduced voltage seen by your
circuit.
> >
> > Bob Ammerman
> > RAm Systems

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