Agilent Technologies U2741A Uživatelská příručka stáhnout pdf (Strana 73)

Measurement Tutorial 3

U2741A User’s Guide 55

AC Measurements

True RMS AC measurements

True RMS responding digital multimeter, like the U2741A,

measure the "heating" potential of an applied voltage. Power

dissipated in a resistor is proportional to the square of the

voltage waveform. This digital multimeter accurately

measures true RMS voltage or current, as long as the wave

shape contains negligible energy above the instrument's

effective bandwidth.

NOTE

The U2741A uses the same techniques to measure true RMS voltage and

true RMS current.

Ta bl e 3 - 3 Waveform shapes and their parameters

Waveform shape Crest factor (CF) AC RMS AC+DC RMS

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User's Guide.book Page 55 Friday, August 8, 2008 9:11 AM

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Agilent Technologies U2741A Uživatelská příručka Strana 73