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18
4-6. Diode ( ) Test
CAUTION
T ur n th e pow er OFF on the test
circuit.
1.
Set rotary selector to
position.
2.
Press menukey 3 to select Diode
Test function.
is displayed in
the primary display.
3.
Connect the test leads as shown
and observe the digital display.
Normal f orward v olt age dr op
(forward biased) for a good silicon
diode is between 0.4 V to 0.9 V. A
reading higher than that indicates a
leak y diode (def ecti ve). A z ero
reading indicates a short ed diode
(def ect ive). An
indicates an
open diode (defective).
4.
Reverse the test leads connections
(reverse biased) across the diode.
5.
The primary display shows
i f
the di ode is good. Any other
readi ngs i ndicat e t he di ode is
resistive or shorted (defective).
Use the table below to determine if the
diode is Good or Bad.
4-7. Frequency
1. Set rotary selector to Hz position.
2. Insert black lead into COM terminal
and read lead into Hz terminal.
3. Touch black probe to ground and
touch red probe to the “Signal out”
wire on the sensor.
FORWARD BIAS( )
0.4 to 0.9 V
OFL
OFL
1.0 to 3.0 V
0.4 to 0.9 V
OFL
0.0000 V
REVERSE BIAS( )
OFL
0.4 to 0.9 V
1.0 to 3.0 V
OFL
0.4 to 0.9 V
OFL
0.0000 V
DIODE
Good
Bad
