Continuity Check; Diode Test - Extech Instruments 411 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. Touch the test probe tips to the circuit or wire you wish to check.
4. If the resistance is less than approximately 150, the audible signal
will sound. If the circuit is open, the display will indicate "1".

DIODE TEST

1. Insert the black test lead banana plug into the negative COM jack and
the red test lead banana plug into the positive diode jack.
2. Turn the rotary switch to the
3. Touch the test probes to the diode under test. Forward bias will
typically indicate 400 to 1000. Reverse bias will indicate "1 ".
Shorted devices will indicate near 0 and the continuity beeper will
sound. An open device will indicate "1 " in both polarities.
position.
position.
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