What's your preferred way to measure uA with a cheap DMM?

dl324

Joined Mar 30, 2015
15,097
How many uA? What is the nature of the circuit?

The shunt resistance of many meters on the 200uA scale is 1k ohm. Would that be enough to affect the circuit?
 

crutschow

Joined Mar 14, 2008
30,757
What is the current range you want to measure?
Would a shunt resistor in series with you circuit that causes a 200mV drop at full load be a problem?
 

Reloadron

Joined Jan 15, 2015
6,951
I'm curious as to what other's preferred method is to test uA with an inexpensive multimeter? Thanks in Advance!
I need to measure a low power circuit (5-100uA)
I usually test with a dummy resistor load and verify with a scope.
I will assume DC current. You can buy a DC uA analog panel meter relatively inexpensive and place it in series with your load. Really depends on how accurate you need to be or to what uncertainty is good enough.

Ron
 

rsjsouza

Joined Apr 21, 2014
365
Years ago I bought Dave Jones' µCurrent gizmo - it works very well on any general purpose multimeter.

However, since then I have got a few 5-1/2 digit bench meters (Keithley 191, Racal Dana 5001) that turn any precision 1Ω or 10Ω resistor into a very reasonable way of measuring µA with low dropout..
 
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