Ac Voltage Measurements; Dc Voltage Measurements - Extech Instruments 381676 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 present. 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 voltage if a motor on the circuit is being
switched ON or OFF. Large surges may occur that can damage the meter.
1. Set the function dial to the V
position.
2. Use the FUNC button to select
AC.
3. Insert the black test lead banana
plug into the negative jack at the
bottom of the meter.
4. Unscrew the retracting nut
(clockwise) to draw out the
positive test lead.
5. Touch the black test probe tip to
the neutral side of the circuit.
6. Touch the positive test probe tip to the "hot" side of circuit.
7. Read the voltage on the display. The meter automatically selects the
optimum range or the user may manually select a range using the RANGE
button.

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 dial to the V position.
2. Use the FUNC button to select DC.
3. Insert the black test lead banana plug
into the negative jack at the bottom of
the meter.
4. Carefully turn the positive test lead
retracting nut (located at the top of the meter) clockwise to completely
draw out the positive test lead probe.
5. Touch the black test probe tip to the negative side of the circuit.
6. Touch the positive test probe tip to the positive side of the circuit.
7. Read the voltage on the display. The meter automatically selects the
optimum range or the user may manually select a range using the RANGE
button.
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381676 V2.0 06/06