CMP-200
9
*The crest factor is the ratio of the peak value to the RMS value; it is represented by the
Greek letter ξ.
mrofevaW
eulaVSMR 001001001001
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*rotcaFtserC
(ξ)
414.1137.12
AC Measurement
AC measurements are usually displayed as RMS
(root mean squared)
values. Two methods of
AC measurement are
average-responding RMS calibrated
and
true RMS-reading.
The average-responding RMS calibrated method takes the average value of the input signal,
multiplies it by 1.11, and displays the result. This method is accurate if the input signal is a
pure sine wave.
The true RMS-reading method uses internal circuitry to read the true RMS value. This method
is accurate, within the specified crest factor limitations, whether the input signal is a pure sine
wave, a square wave, sawtooth, half wave or signal with harmonics. The ability to read true
RMS provides much more measurement versatility. The Greenlee CMP-200 is a true RMS
meter.
The Waveforms and Crest Factors table shows some typical AC signals and their RMS values.
Waveforms and Crest Factors
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