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How to measure the internal resistance of a voltmeter? (megger vs multimeter)

07 Jan 2019 | about 11 months ago

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You can measure the internal resistance of a multimeter using megger tester.
As you can see in this video, $5 DMM is not accurate and lower internal resistance(1MΩ). So, it will more influence on the measured circuit.

Fluke 107 Internal Resistance = 10 MΩ
Hioki 3244-60 Internal Resistance = 10 MΩ
$5 Multimeter Internal Resistance = 1 MΩ

Another method is using series resistor.
This resistor in combination with the internal resistance will form a voltage divider.
If you apply 5V over a 1M series resistor, and the DMM shows it as 2.5V, then the internal resistance is 1MΩ

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[전기실무/전기기초]카드 테스터기 사용방법입니다~~^^.(digital multi tester) HIOKI/3244-60


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