8. NCV
IX. Measurement Operation Instructions
1. AC Current Measurement (see Figure 3)
1) Set the switch to AC current mode and press the
trigger to open the clamp head. Position the
conductor in the clamp head and slowly release
the trigger until the clamp head is completely
closed. Be sure the conductor is clamped to the
center of the clamp head, otherwise additional
errors may be introducted. Only one current
conductor should be measured at a time.
Measuring two or more current conductors may
result in erroneous measurement readings.
2) Read the AC value directly from the display.
Note:
• Be sure the conductor to be measured is
clamped at the center of the clamp head, if not,
an additional reading error of ±1.0% may result.
GCM-407 User Manual
GCM-407 User Manual
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• The true RMS AC current meaurement accuracy
is based on sinusoidual waveforms. For
non-sinusoidal waveforms, adjust the accuracy
as follows:
Crest factor 1.4 ~ 2.0: additional ±1.0%
Crest factor 2.0 ~ 2.5: additional ±2.5%
Crest factor 2.5 ~ 3.0: additional ±4.0%
Summary of Contents for GCM-407
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