Diode Test - Extech Instruments MA160 User Manual

Diode Test
1. Insert the black test lead banana plug into the negative COM jack and the red test
lead banana plug into the
2. Turn the function switch to
diode and voltage symbols will appear on the LCD when in Diode test mode.
3. Touch the test probe tips to the diode or semiconductor junction under test. Note the
meter reading.
4. Reverse the test lead polarity by reversing the red and black leads. Note this reading.
5. The diode or junction can be evaluated as follows:
 If one reading displays a value (typically 0.400V to 0.900V) and reverse reading displays
OL, the diode is good.
 If both readings display OL the device is open.
 If both readings are very small or '0', the device is shorted.
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positive jack.
position. Use the M button to select the diode function, the
Fig 4‐8 DIODE TESTING
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