5 EX540-EN V1.2 7/10
Operating Instructions
WARNING
: Risk of electrocution. High-voltage circuits, both AC and DC, are very
dangerous and should be measured with great care.
1.
ALWAYS turn the function switch to the
OFF
position when the meter is not in use.
2.
If “OL” appears in the display during a measurement, the value exceeds the range
you have selected. Change to a higher range.
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
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.
AC VOLTAGE (FREQUENCY, DUTY CYCLE) 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
VAC/Hz/%
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.
Touch the red test probe tip to the “hot” side of the circuit.
4.
Read the voltage in the main display and the frequency in the right
auxiliary display
5. Press
the
MODE
button to indicate “
Hz
”.
6.
Read the frequency in the main display.
7. Press
the
MODE
button again to indicate “
%
”.
8.
Read the % of duty cycle in the main display.
9.
With ACV in the main display, press EXIT for 2 seconds to measure AC+DC.