Resistance Measurements; Continuity Check; Diode Test - Extech Instruments MA260 User Manual

Resistance Measurements
1. Insert the black test lead banana plug into the negative (COM) jack.
Insert the red test lead banana plug into the positive (V/Ω) jack.
2. Touch the test probe tips across the circuit or part under test. It is
best to disconnect one side of the part under test so the rest of the
circuit will not interfere with the resistance reading.
3. Read the resistance in the display. The display will indicate the
proper decimal point and value.
Continuity Check
1. Insert the black lead banana plug into the negative (COM) jack.
Insert the red test lead banana plug into the positive (V/Ω) jack.
2. Touch the test probe tips to the circuit or wire you wish to
check.
3. If the resistance is less than approximately 25Ω, the audible
signal will sound. If the circuit is open, the display will indicate
"OL.".
4. Note that the beeper is off when the resistance is > 400Ω.
However the beeper may sound when the resistance is
between 25Ω and 400Ω.
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 (V/Ω) jack.
2. Touch the test probes to the diode under test. Forward voltage will
indicate 0.4 to 0.8V Reverse voltage will indicate "OL". Shorted
devices will indicate near 0 ohms and beep; an open device will
indicate "OL" in both polarities.
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