User's Manual

8 EX540 V1.0 2/09
CONTINUITY CHECK
WARNING: To avoid electric shock, never measure continuity on circuits or wires that
have voltage on them.
1. Set the function switch to the Ω CAP position.
2. Insert the black lead banana plug into the negative COM jack.
Insert the red test lead banana plug into the positive Ω jack.
3. Press the MODE button to indicate“ "and “Ω” on the display
4. Touch the test probe tips to the circuit or wire you wish to check.
5. If the resistance is less than approximately 35Ω, the audible signal will
sound. If the circuit is open, the display will indicate “OL”.
DIODE TEST
1. Set the function switch to the Ω CAP position.
2. Insert the black test lead banana plug into the negative COM jack and
the red test lead banana plug into the positive V jack.
3. Press the MODE button to indicate “ “ and “V” on the display.
4. Touch the test probes to the diode under test. Forward voltage will
typically indicate 0.400 to 0.700V. Reverse voltage will indicate “OL”.
Shorted devices will indicate near 0V and an open device will indicate
“OL” in both polarities.
CAPACITANCE MEASUREMENTS
WARNING: To avoid electric shock, disconnect power to the unit under test and
discharge all capacitors before taking any capacitance measurements. Remove the
batteries and unplug the line cords.
1. Set the rotary function switch to the Ω CAP position.
2. Insert the black test lead banana plug into the negative COM jack.
3. Insert the red test lead banana plug into the positive V jack.
4. Press the MODE button to indicate “F”
5. Touch the test leads to the capacitor to be tested.
6. Read the capacitance value in the display