Continuity Check; Diode Test - Extech Instruments EX570 User Manual

CONTINUITY CHECK

WARNING: To avoid electric shock, never measure continuity on circuits or wires that
have voltage on them.
1. Rotate the function switch to the Ω
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 SELECT button to indicate"
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. Rotate the function switch to the green Ω
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 SELECT button to indicate "
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.
position.
" on the display
position.
" and "V"     o n the display.
8 EX570-ENG V2.3 3/09