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NOTE: A diode is a semiconductor device that lets current flow
in one direction only. If the diode to be tested is part of a circuit
(with other electronic components), you must isolate it from the
other components by disconnecting at least one side of it from
the circuit before testing. A good diode will show a low voltage
drop across its junction (0.5-0.8 volts for a silicon diode or about
0.3V for a germanium diode) when the leads are connected in
one polarity and a very high resistance (or open circuit) when the
leads are reversed (connected in the opposite polarity).
1. Plug the RED test lead into the jack of the tester; plug
the BLACK test lead into the "COM" jack.
2. Set the tester’s Function/Range Selector Switch to the
position (see Controls and Indicators, Item 3).
3. Press the SEL button, as necessary, until the icon is
shown on the display.
4. Place the RED test lead onto one side of the diode being
tested and the BLACK test lead onto the other side.
5. Read the results on the display.
6. Reverse the test leads and again read the results on the
display. Compare the two readings. One reading should
indicate a voltage drop value; the other reading should
indicate an overrange (OL) condition. See previous note.
D. CONTINUITY TEST
WARNING
To avoid electric shock, shut off the power to the test article
before testing it for continuity.
1. Plug the RED test lead into the jack of the tester; plug the
BLACK test lead into the "COM" jack.
2. Set the tester’s Function/Range Selector Switch to the
position (see Controls and Indicators, Item 3).
3. Press the SEL button, as necessary, until the icon is
shown on the display.
4. Place the RED Test Lead to one end of the wire or device
being tested for continuity and the BLACK Test Lead to the
opposite end.
5. Listen to the sound of the beeper and confirm the results by
reading the display.
NOTE: The beeper will sound only if the continuity of the
item under test (resistance between the two test leads)
measures less than 120 ohms.
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