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Topic: Measuring Amperage (Read 1 time) previous topic - next topic


It will take a higher current when motor has a load to move.
Max is called "stall" current. Motor and power supply should survive it, for a short period ;)

Drew Davis

Thanks for all the help!

Krupski/JimboZA: I believe we came to the conclusion that it is not a stepper because it only has two wires. Do steppers some times have only 2 wires? I don't really know I'm just going off what majenko said.

Michel: When testing it I will put some load on it.

I looked online and it did not say if my multimeter has a ammeter in it. What do you guys think? If it doesn't what brand do you recommend me buying?

Thanks !



Yep it does... in the pic on that link, the grey switch segment at about 4 o'clock says "10A".

3 holes for the leads is also a giveaway, since current is usually (always?) measured on its own connection.

Edit... the left hand socket is colour coded grey and also says 10A
Roy from ITCrowd: Have you tried turning it off an on again?
I'm on LinkedIn: http://www.linkedin.com/in/jimbrownza

Drew Davis

Thanks! I will test it out later to day.

Do you think it will be accurate?


Jan 21, 2013, 05:30 pm Last Edit: Jan 21, 2013, 05:37 pm by michael_x Reason: 1
As you ask, it might be interesting to you that for current measurement the DMM has to be in series with the circuit.
So you have to put it between the +12V supply and one of the motor pins. The other motor pin then goes to the supply GND (or - Pin).

Accurate enough to multiply by 2 for some safety margin regarding which device should control and supply it finally.
You want results like (100mA, 200mA, 500mA, 1A, 2A, more ), both for high load and free running.

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