-23-
H.V.Diode (RECTIFIER)
STEP 1. Test the diode to see if it is
shorted.
Procedure:
1. Select the
Ω
scale on the meter.
2. Place the meter leads across the diode as
pictured in Figure 1. The reading should be
“40M
Ω
,” “OL,” or a reading of infinity.
3. Reverse the meter leads. The reading
should again indicate a reading of infinity. If
the diode shows “infinity” in BOTH
directions, it is NOT shorted.
4. If the diode is not shorted, proceed to step 2.
STEP 2. Test the diode for forward biasing.
Procedure:
1. Select the DCV scale on the meter.
2. Using the meter, battery and jumper wire,
connect the items as illustrated in Figure 2.
This has the positive side of the battery
connected to the cathode of the diode.
3. The diode should be forward biased
therefore a voltage reading of approximately
4.7 VDC to 6.4 VDC will be read depending
on meter, battery strength, etc. (Note: If the
meter leads were reversed, a negative
voltage of the same amount would be seen.)
STEP 3. Test the diode for reverse biasing.
Procedure:
1. Using the same scale on the meter, connect
the positive side of the battery to the anode
of the diode as illustrated in Figure 3.
2. The diode should be reverse biased
therefore a reading of 0 volt or a value
displayed in mV will be seen. (The display
will be erratic changing
values rapidly in the mV scale.)
COMPONENTS
TEST PROCEDURE
RESULTS
Normal:
Approximately
4 .7-6.4V
Normal:
Approximately 0V
Figure 1
Figure 2
Figure 3
Summary of Contents for 721.62342200
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