Amprobe ACD-330T Clamp-On-Multimeter - Manual (Page 33)

DIODE CHECK
A good diode allows current to flow in one direction only. To test a diode, turn the
power off, remove the diode from the circuit, and proceed as follows:
1 ) Set the rotary switch to " "position.
2) Connect the black test lead to "COWterminal and red test lead
to " V-
Ω "terminal.
3) Touch the red lead to the positive side of the diode and the black lead to the neg-
ative side. The meter can display diode voltage drops to approximately 2.5 V.A typ-
ical voltage drop is 0.3~0.8 V, and the meter will sound a beep to remind user.
4) Reverse the probes and measure the voltage across the diode again. If the diode is:
• Good : " OL" is displayed.
• Shorted : Near 0 V drop is displayed in both directions, and the
beeper sounds continuously.
• Open : " OL" is displayed in both directions.
5) Repeat step 3 and 4 for other diodes.
Figure 22. Diode Check.
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