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Rob McCutcheon
Rob McCutcheon Posted on Feb 26, 2009
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Need info when testing a resistor how do you know if it`s open or short what do i put my tester too?

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Justin Peters

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Justin Peters
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I made a couple videos about reading and testing resistors. Keep in mind, if you're reading a resistor while it's still in the circuit, it might not read the value that it says on the resistor because of the circuit it's in. While in circuit it can only read the value of the resistor or less. If it reads more ohms while in circuit, then the resistor is probably open. My meter reads OUCH when it's open and 0 when it's shorted.

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  • Posted on Feb 26, 2009
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You set your tester to Ohms and if it is open the reading will not change, if it is shorted (not likely) the reading will go to zero, and finally if it is fine then the reading will correspond with the resistor value.

Remember not to hold both of the leads as you do these tests as you are a giant resistor and will change the readings.

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