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
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. Touch the test probe tips to the
circuit or wire you wish to check.
4. If the resistance is less than
approximately 150Ω, 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
position.
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.
12 V4.0 5/07