Resistance Measurements; Continuity Test; Diode Test - Extech Instruments EX623 User Manual

Resistance Measurements

Note: Remove power from the device under test before making resistance measurements
1. Slide the input shutter to the up position.
Set the function switch to the position.
2.
3. Insert the black test lead banana plug into the negative COM jack.
Insert the red test lead banana plug into the positive V jack.
4. Touch the black test probe tip to one side of the device.
Touch the red test probe tip to the other side of the device.
5. Read the resistance value in the display.

Continuity Test

1. Connect as described for resistance measurements.
2. Press the MODE button to select continuity
3. Touch the test probe tips across the circuit or component under test.
4. If the resistance is < 50, a tone will sound.

Diode Test

1. Connect as described for resistance measurements
2. Press the MODE button to select diode test
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 01.800V) and the other 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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