3.2.5 Diode Test
To avoid electrical shock and/or damage to the
instrument,
disconnect
circuit
power
and
discharge all high-voltage capacitors before
testing diodes.
To test a diode out of a circuit (set up the Meter as shown in
Figure 3-3):
1. Set the rotary switch to
range.
2. Press the
SELECT
key to select Diode Test.
3. Connect the black and red test leads to the COM and V
terminals respectively.
4. For forward-bias readings on any semiconductor
component, place the red test lead on the component's
anode and place the black test lead on the component's
cathode.
5. The meter will show the approx. forward voltage of the
diode.
In a circuit, a good diode
(Si)
should still produce a forward
bias reading of 0.5V to 0.8V; however, the reverse-bias
reading can vary depending on the resistance of other
pathways between the probe tips.
