4.If the polarity of the test leads is
reversed with diode polarity, the
display reading shows “OL”.
This can be used to distinguish
the anode and cathode sides
of a diode.
5.For silicon diode, forward bias
voltage should be 0.5
〜
0.8V,
for germanium diode, forward
bias voltage should be 0.2
〜
0.3V.
A “0 V” reading in both directions
indicates a shorted diode.
An “OL” reading indicates an
open diode. In either case, the
diode is defective and should
be replaced.
red test lead black test lead
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