Continuity Check; Diode Test - Extech Instruments EX430A User Manual

CONTINUITY CHECK

1. Set the function switch to the green
2. Insert the black lead banana plug into the negative COM jack.
3. Press the SELECT button to indicate 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 150, the audible signal will

DIODE TEST

1. Set the function switch to the green
2. Insert the black test lead banana plug into the negative COM jack and the red test lead banana
3. Press the SELECT button to indicate on the display.
4. Touch the test probes to the diode under test. Forward voltage will
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WARNING: To avoid electric shock, never measure continuity on circuits or wires that have
voltage on them.
Insert the red test lead banana plug into the positive  jack.
sound. If the circuit is open, the display will indicate "OL".
plug into the positive diode jack.
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.
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