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Meter Illogical

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Printed Date: 27 Mar 2026 at 2:12am
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Topic: Meter Illogical

Posted By: Graham Slee
Subject: Meter Illogical
Date Posted: 22 Apr 2009 at 2:20am

When measuring voltages around a circuit you may get some illogical results... Why?

All multimeters have an input resistance when measuring on the voltage ranges.

This input resistance appears in parallel with the resistance of the part of the circuit you are measuring.

If the circuit resistance is high the meter input resistance may be low enough to drag the voltage down.

Hence the illogical measurement.

Just thought it may be of interest?

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