Extech Instruments 381676A User Manual page 7

AC and DC VOLTAGE MEASUREMENTS
WARNING: Risk of Electrocution for AC Measurements. 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 determining that no voltage is present.
CAUTION: Do not measure AC or DC voltage if a motor on the circuit is being switched ON or
OFF. Large surges may occur that can damage the meter.
WARNING: To prevent electric shock and damage to the meter or personal injury, do not
measure voltages that may exceed 600V DC or AC rms.
NOTES:
Before connecting the probe and test lead at lower voltage ranges, the display may show erratic
readings. This is normal because the meter is highly sensitive. Once a connection is made, the
true reading will be displayed.
'OL' indicates an over‐range condition in manual mode. A higher range should then be selected.
In manual mode, select the highest range first if the value to be measured is unknown then lower
the range as needed.
The AC millivolt range is only available in the manual range mode.
1. Use the probe cover if making measurements on category III or above installations.
2. Set the function dial to the V position.
3. Use the Mode (M) button to select AC or DC.
4. Insert the black test lead banana plug into the negative jack at the bottom of the meter.
5. Touch the black test probe tip to the neutral side of the circuit for AC measurements or to
the positive side of the circuit for DC measurements.
6. Touch the positive test probe tip to the "hot" side of circuit for AC measurements or to the
negative side of the circuit for DC measurements.
7. Read the voltage on the display. The meter automatically selects optimum range or the user
may manually select a range by pressing the Range (R) button. Press and hold the Range (R)
button to return to the AUTO Range mode.
nd Quality Products Online at:
7
GlobalTestSupply
www.
381676A-en-GB_V1.1 08/15
.com
sales@GlobalTestSupply.co