Testing Diodes
• To avoid possible damage to the meter or to the
equipment under test, disconnect circuit power and
discharge all high-voltage capacitors before testing
diodes.
CAUTION
!
Use the diode test to check diodes, transistors, silicon
controlled rectifiers (SCRs), and other semiconductor
devices. This function tests a semiconductor junction
by sending a current through the junction, then
measuring the junction's voltage drop. A good silicon
junction drops between 0.5V and 0.8V.
For forward-bias readings on any semiconductor
component, place the red test lead on the component's
positive terminal and place the black lead on the
component's negative terminal. In a circuit, a good
diode should still produce a forward-bias reading of
0.5V to 0.8V.
For reverse-bias readings on any semiconductor
component, the meter still can measure. In a circuit, a
good diode should still produce a reverse-bias reading
of -0.5V to -0.8V.
The display shows “OL” if the diode is open or short.To
use diode test, turn the rotary switch to resistance
position, then press the function (yellow) button to
select measuring mode.
501 / 502
EN
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