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

#### Mr. Multimeter

Joined Sep 17, 2018
68
I'm curious as to what other's preferred method is to test uA with an inexpensive multimeter? Thanks in Advance!

#### atferrari

Joined Jan 6, 2004
4,748
In series with the load, maybe?

#### dl324

Joined Mar 30, 2015
16,696
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?

#### Mr. Multimeter

Joined Sep 17, 2018
68
I need to measure a low power circuit (5-100uA)
I usually test with a dummy resistor load and verify with a scope.

#### crutschow

Joined Mar 14, 2008
34,054
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?

#### spinnaker

Joined Oct 29, 2009
7,830
Get yourself a .1 Ohm of appropriate wattage in series with your load and then just measure voltage.

#### crutschow

Joined Mar 14, 2008
34,054
Get yourself a .1 Ohm of appropriate wattage in series with your load and then just measure voltage.
That only works for measuring μA if you have a microvolt meter.

Joined Jan 15, 2015
7,453
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

#### spinnaker

Joined Oct 29, 2009
7,830
That only works for measuring μA if you have a microvolt meter.

Oh missed the uA part.

#### rsjsouza

Joined Apr 21, 2014
383
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..