Ac Voltage Measurements - Extech Instruments MG320 User Manual

6.5 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.
Do not measure voltages higher than 600V
When the measured voltage is > 60VDC or 600VAC the meter flashes the warning icon on the upper left.
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
2. Insert the black test lead banana plug into the negative COM jack
(6).
Insert red test lead banana plug into the positive V jack (7).
3. 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.
4. Read the voltage in the main display and in the lower bargraph.
5. Short press the H (Hold) button to freeze (H icon displayed) or
unfreeze (no H icon displayed) the displayed reading.
6. Press
7. Note that the Auto Power OFF function activates after 3 minutes
of inactivity. The meter will audibly beep just prior to shutting off.
8. Note that the Auto Power OFF function activates after 3 minutes
of inactivity. The meter will audibly beep just prior to shutting off.
position.
to store the reading
8
V
AC
0 100 200 300 400 500 600 700
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