|How to measure amps with a DMM
Digital Multi Meter Volt Meter
STEP 1: Look up the owner's manual of your volt meter if you don't have one. Review the section on safety and measuring current.
STEP 2: Determine how many AMPs your digital multi-meter is able to measure before it blows it's fuse. (Most can handle about 10 Amps.)
STEP 3: Plug the black wire probe into the hole on your volt meter labeled "COM" or common or negative.
STEP 4: Plug the red probe into the hole on the DMM labeled 10A or + current.
STEP 5: Now disconnect the wire that you will be taking current measurements on.
STEP 6: Connect one wire from the DMM to the wire end using alligator clip patch cords.
STEP 7: Connect the other wire from your DMM to the terminal where your wire used to be connected.
STEP 8: Do not do this at high voltage unless you have had proper training. 12 Volts and under is typically pretty safe when it is under 10 Amps.
STEP 9: Turn on your DMM and then your circuit, you should see a number on your DMM indicating "Amps" If it is negative when it should be positive, then reverse the black and red cables on your DMM and that will fix the problem.
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