Ac Voltage Measurements; Dc Voltage Measurements - Extech Instruments EX310 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 600 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.
Read the voltage in the display.
5.

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 highest 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. Move the function
switch to successively lower VDC positions to
obtain a higher resolution reading.
5 Model EX310 - Version 7.1 – 05/2006
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