Amprobe ACD-330T Clamp-On-Multimeter - Manual (Page 22)

1 ms PEAK HOLD
You can use this Meter to analyze components such as power distribution transformers
and power factor correction capacitors. The additional features allow the measurement of
the half-cycle peak current by using the 1 ms peak hold feature. This allows the determi-
nation of the crest factor:
Crest factor= Peak value/True rms value
1) Press PEAK button for more than 1 second to toggle I ms peak hold mode ON/OFF.
2) Press PEAK button momentarily to select PEAK+ measurement after entering the
peak mode. The display shows "DH MAX" to indicate the PEAK +. See Figure 14.
3) If the reading is " OL", then you can push RANGE button momentarily to change
measuring range and restart the PEAK+ measurement after setting the peak mode.
4) Press .))) button to re-set the 1 ms peak hold again after setting peak mode.
Note: A crest factor of 1.4 indicates a sinusoidal waveform.
Figure 14. 1 ms Peak Hold Display
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