Diode Test; Battery Test - Extech Instruments MN45 User Manual

DIODE TEST

1. Set the function switch to the
2. Insert the black test lead banana plug into the negative COM jack
and the red test lead banana plug into the positive
3. Touch the test probes to the diode under test.
4. Forward voltage will indicate 400 to 700mV.Reverse voltage will
indicate "1".
5. A shorted diode will indicate the same value of resistance in both
the reverse and forward test directions. Shorted diodes will
indicate near 0mV. An open diode will indicate "1" in both test
directions.

BATTERY TEST

CAUTION: Do not measure batteries while they are installed in the devices they are
powering. The batteries must be removed from installations before tests can be made.
1. Set the function switch to the 1.5V or 9V BAT switch position.
Use the 1.5V position for 'AAA', 'AA', 'C', 'D', and other 1.5V
batteries. Use the 9V position for square 9V transistor batteries.
2. Insert the black test lead banana plug into the negative COM jack.
Insert the red test lead banana plug into the positive V jack.
3. Touch the black test probe tip to the negative side of the battery.
Touch the red test probe tip to the positive side of the battery.
4. Read the voltage in the display.
Good
9V battery >8.2V
1.5V battery >1.35V
position.
Weak Bad
7.2 to 8.2V <7.2V
1.22 to 1.35V <1.22V
7
jack.
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MN42-EU - V1.1 – 07/2010