Fluke 43B
Applications Manual
14
Testing a Diode
Check a diode in both forward direction and reverse direction. Useful for
checking whether the diodes in a rectifier are still intact.
1
Open the main menu.
2
3 Select (diode)
4
Make connections as shown below:
Observe the voltage in forward direction (A). It should read about 0.5V.
Now turn the diode in reverse direction (B) and look at the display again.
• The Fluke 43B should display OL (Over Load), indicating a very high
resistance. If not, the diode is faulty and should be replaced.
OHMS
CONTINUITY
CAPACITANCE
A
B
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