CEM DT-6505, Manual

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8
AC VOLTAGE (FREQUENCY, DUTY CYCLE) MEASUREMENTS
WARNING:
Risk of Electrocution. The probe tips may not be long
enough to contact the live parts 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 function switch to the position.
2. Press the MODE button to indicate “ AC ”.
3. Insert the black test lead banana plug into the
negative COM jack.
Insert red test lead banana plug into the
positive V jack.
4. Touch the black test probe tip to the neutral
side of the circuit.
Touch the red test probe tip to the “hot” side
of the circuit.
5. Read the voltage in the display.
6. Press the
MODE button to indicate “ Hz(%) ”.
7. Read the frequency in the main display and
the duty in the auxiliary display .