2. AC Voltage Measurement (see Figure 4)
1) Insert the red test lead in the “V” input jack and
the black test lead in the “COM” input jack.
2) Rotate the function dial to the AC voltage
measurement function and connect the test leads in
parallel to the load to be measured.
3) Read the AC voltage from the display.
Note:
• Do not input voltages greater than AC 750V.
Higher voltages may damage the meter.
• Be aware that higher voltages can cause electric
shock.
• After all measurement operations are completed,
disconnect the test leads from the EUT.
• When the measured voltage is greater than the
safety voltage of 30VAC, the LCD will display a
high voltage warning prompt, “ ”. When
voltages greater than the AC 750V range are
input, the meter warning prompt, “ ”, will flash
and the meter will automatically buzz intermit
-
tently.
4
GCM-407 User Manual
GCM-407 User Manual
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• The true RMS AC voltage 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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