Ac Voltage Measurements - Extech Instruments EX330 User Manual

AC VOLTAGE 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 VAC position.
2. Insert the black test lead banana plug into
the negative COM jack.
Insert red test lead banana plug into the
positive V jack.
3. Touch the black test probe tip to the neutral
side of the circuit.
4. Touch the red test probe tip to the "hot" side
of circuit.
5. Read the voltage in the display.
6. If the measured AC voltage exceeds the
highest range of the meter (refer to the
specification table) an audible tone will
sound.
EX330-EU-ENG – V4.2 1/08
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