True-RMS Measurement Pt.1: AC vs. AC+DC

Roger demonstrates the difference between so called "True-RMS" (only AC) and "True-RMS AC+DC" multimeters and a simple AC-averaging multimeter.

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Only "True-RMS AC+DC" multimeters give you a reliable measurement and the differences between the three tested multimeters are quite striking.
There remain some error-sources even with a good True-RMS AC+DC multimeter which will be investigated in Pt.2 of this video.

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