EX420-EU_ENG
V3.1
6/09
7
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 green V position.
2. Press the SELECT button to indicate “AC” on the display.
3. Insert the black test lead banana plug into the negative
COM
jack.
Insert red test lead banana plug into the positive
V
jack.
4. Touch the black test probe tip to the neutral side of the circuit.
Touch the red test probe tip to the “hot” side of the circuit.
5. Read the voltage in the display.
DC CURRENT MEASUREMENTS
CAUTION:
Do not make current measurements on the 20A scale for longer than 30
seconds. Exceeding 30 seconds may cause damage to the meter and/or the test leads.
1. Insert the black test lead banana plug into the negative
COM
jack.
2. For current measurements up to 4000µA DC, set the
function switch to the yellow µA position and insert the
red test lead banana plug into the
µA/mA
jack
3. For current measurements up to 400mA DC, set the
function switch to the yellow mA position and insert the
red test lead banana plug into the
µA/mA
jack.
4. For current measurements up to 20A DC, set the
function switch to the yellow 20A range and insert the
red test lead banana plug into the
20A
jack.
5. Press the SELECT button to indicate “
DC
” on the
display.
6. Remove power from the circuit under test, then open up
the circuit at the point where you wish to measure
current.
7. 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.
8. Apply power to the circuit.
9. Read the current in the display.
