Checking The Integrity Of A Diode - General CM660 User Manual

(2) Plug the red and black test leads into the red and
black jacks at the bottom front of the meter.
(3) Touch or clip the test leads to any two points of a
circuit. The resistance between those two points
will be shown on the primary readout. If the
resistance is <50Ω, the beeper will sound
continuously. If there is no continuity (an open
circuit or a resistance greater than 600Ω between
the two points), O.L will appear on the primary
readout.

CHECKING THE INTEGRITY OF A DIODE

(1) Turn the function switch to the
the FUNC/INRUSH button twice to select the diode
check function. If test leads are not plugged into
the meter's front-panel jacks, the primary readout
will show O.L, with the icon of a diode (
above it.
(2) Plug the red and black test leads into the red and
black jacks at the bottom front of the meter.
(3) Touch or clip the red test lead to the anode
(positive terminal) of the diode to be tested, and
the black test lead to its cathode (negative
terminal).
RED TEST LEAD
(4) Read the forward bias voltage value on the display.
A silicon diode typically has a forward bias voltage
of 0.7V. A germanium diode typically has a forward
bias voltage of 0.3V. A 0V 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.
position. Press
)
BLACK TEST LEAD
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