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Question posted by thangp on June 9th, 2021

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Fluke 744, all other functions working excepted "Ohm measurement" shows " !!!!!" . Unable to measure resistance.

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Answer #1: Posted by SonuKumar on June 9th, 2021 7:21 PM

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SonuKumar

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https://www.instrumart.com/assets/744-manual.pdf

Why can't you measure resistance in a live circuit?

A meter has a known voltage, and a measured current so the resistance is calculated, or a known current and a measured voltage, so once again, the resistance is calculated. But when your circuit is powered, the voltage and/or current are no longer a known value, so neither is the resistance.

Typically, good wire connections have a resistance of less than 10 ]7; (often only a fraction of an ohm), and isolated conductors offer a resistance of 1 M]7; or greater (typically tens of megohms, depending on humidity).

https://www.youtube.com/watch?v=VZaPWrI6keM

https://www.youtube.com/watch?v=wt4xx4VKiEM

https://www.youtube.com/watch?v=0HYx3ydQidU

https://www.youtube.com/watch?v=ZNhKqlbrQkY

https://www.quora.com/What-are-some-common-reasons-a-multimeter-cant-measure-resistance

https://www.seaward.com/gb/support/resistance/faqs/59780-a-guide-to-resistance-measurement

Please respond to my effort to provide you with the best possible solution by using the "Acceptable Solution" and/or the "Helpful" buttons when the answer has proven to be helpful.

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Sonu
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