Ac Voltage Measurements; Dc Voltage Measurements - Extech Instruments EX320 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 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.
4. Touch the red test probe tip to the "hot" side of
circuit.
5. Read the voltage in the display.

DC VOLTAGE MEASUREMENTS

CAUTION: Do not measure DC 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 VDC position.
2. Insert the black test lead banana plug into the
negative COM jack. Insert the red test lead
banana plug into the positive V jack.
3. Touch the black test probe tip to the negative
side of the circuit. Touch the red test probe tip to
the positive side of the circuit.
4. Read the voltage in the display.
5 Model EX320 - Version 4.0 –05/2006