Continuity Check; Diode Test; Capacitance Measurements - Extech Instruments EX330 User Manual

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
2. Insert the black lead banana plug into the negative COM jack.
Insert the red test lead banana plug into the positive  jack.
3.
Use the MODE button to view the icon on the display.
4.
5. Touch the test probe tips to the circuit or wire you wish to check.
6. If the resistance is less than approximately 100, the audible signal
will sound. If the circuit is 'open' (bad), the display will indicate "OL".

DIODE TEST

1. Set the function switch to the
2. Insert the black test lead banana plug into the negative COM jack and
the red test lead banana plug into the positive
3. Use the MODE button to view the
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 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 CAP jack.
4. Use the MODE button to view the unit of measurement.
5. Touch the test leads to the capacitor to be tested.
6. The test may take up to 3 minutes or more for large capacitors to
charge. Wait until the readings settle before ending the test.
7. Read the capacitance value in the display
position.
position.
jack.
icon on the display.
8 EX330-EN v5.0 06/14