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.
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 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.
7 Model EX310-EU-ENG – V7.2– 05/2008