9
AC Voltage (Frequency, Duty Cycle) Measurements
WARNING: Risk of Electrocution. The probe tips may not be
long enough to contact the live par ts inside some 240V outlets
for appliances because the contacts are recessed deep in the
outlets. As a result, the reading may show 0 volts when the
outlet actually has voltage on it. Make sure the probe tips are
touching the metal contacts inside the outlet before assuming
that no voltage is present.
CAUTION: Do not measure AC voltages if a motor on the
circuit is being switched ON or OFF. Large voltage surges may
occur that can damage the meter.
1. Set the rotary function switch to the green VAC/Hz/% position.
2. Insert the black test lead banana plug into the negative
COM jack and the red test lead banana plug into the
positive V jack.
3. Touch the black test probe tip to the neutral side of the
circuit and touch the red test probe tip to the “hot” side
of the circuit.
4. Read the voltage in the display.
5. Press the Hz/% button to indicate “Hz”.
6. Read the frequency in the display.
7. Press the Hz/% button again to indicate “%”.
8. Read the percent of duty cycle in the display.
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