If a DMM (Digital Multimeter) was attached to a circuit will it affect the resistance?

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If a DMM (Digital Multimeter) was attached to a circuit will it affect the resistance?

2007-09-24 17:53:51 · 2 answers · asked by Anonymous in Science & Mathematics ➔ Physics

2 answers

If it's across a huge resistance, then yes. The input impedance for most meters is in the megaohms. Thus if you put it across a megaohm R in a circuit, you've halved the resistance in that circuit.

2007-09-24 18:13:34 · answer #1 · answered by supastremph 6 · 0⤊ 0⤋

Depends on the quality of the DMM you're using. Really good ones don't influence the circuit under test to any significant degree at all.

2007-09-24 18:03:51 · answer #2 · answered by Chug-a-Lug 7 · 0⤊ 0⤋