At 05:27 PM 4/3/2006 +0100, you wrote:

>   Does this sound vaguely reasonable? Surely I'm not the only one having
>trouble measuring PIC sleep currents... How are you guys doing it?

A 1% film resistor shunt and almost any DMM with a low input range and
high input impedance will do it. Select the resistor to drop negligible
voltage at the current in interest, increase the input voltage to compensate
if you feel the need. Measure the resistor value and use that in the
calculation.

In case the current is drawn in brief pulses, a capacitor across the
shunt and a simple RC passive filter in front of the voltmeter can be used
to even out the voltage.

No need to build anything complex; I usually just tack the parts together
in a rat's nest.

Best regards,

Spehro Pefhany --"it's the network..."            "The Journey is the reward"
speff@interlog.com             Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog  Info for designers:  http://www.speff.com
->> Inexpensive test equipment & parts http://search.ebay.com/_W0QQsassZspeff


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