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How to measure the internal resistance of a voltmeter? (megger vs multimeter)
Duration: 01:11Views: 7.4KLikes: 98Date Created: Jan, 2019
Channel: Thomas Kim
Category: Science & Technology
Tags: fluke 107internal resistancedmminsulation testerflukemultimetermeggerhioki 3244-60
Description: 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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