Resistance Measurements; Continuity Check; Diode Test - Extech Instruments MN15A User Manual

RESISTANCE MEASUREMENTS

WARNING: To avoid electric shock, disconnect power to the unit under test and discharge
all capacitors before taking any resistance measurements.
Set the function switch to the highest Ω position.
1.
2. Insert the black test 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 across the circuit or part under test.
4. Read the resistance in the display. Move the function switch to
successively lower Ω ranges to obtain a higher resolution reading.

CONTINUITY CHECK

WARNING: To avoid electric shock, never measure continuity on circuits that have a
voltage potential.
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 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 100Ω, the audible signal
will sound. If the circuit is open, the display will indicate "1.

DIODE TEST

1. Set the function switch to the
2. Insert the black test lead banana plug into the negative COM jack
Insert the red test lead banana plug into the positive
3. Touch the test probes to the diode under test.
4. A typical diode will indicate approximately .400 to .500 volts for the
forward test and "1.
5. A shorted diode will indicate a low value in both the reverse and
forward test directions. An open diode will indicate "1.
directions.
position.
position.
" for the reverse test.
6
".
jack.
" in both test
MN15A V1.1 02/09