36
E N G L I S H
Testing Diodes
(Figure 7)
Warning
To avoid possible damage to the Meter and to the device
under test, disconnect circuit power and discharge all
high-voltage capacitors before testing diodes.
Use the diode test to check diodes, transistors, and other
semiconductor devices. The diode test sends a current through
the semiconductor junction, and then measures the voltage
drop across the junction. A good silicon junction drops
between 0.5 V and 0.8 V.
To test a diode out of a circuit, connect the Meter as follows:
1. Insert the red test lead
into the
Hz
Ω
terminal and the black test
lead into the
COM
terminal.
2. Set the rotary switch to
diode measurement
( ) is default or press
BLUE
button to select
measurement mode.
3. For forward voltage
drop 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.
The measured value shows
on the display.
Note:
• In a circuit, a good diode should still produce a forward voltage
drop reading of 0.5 V to 0.8 V; however, the reverse-voltage
drop reading can vary depending on the resistance of other
pathways between the probe tips.
• Connect the test leads to the proper terminals as said above to
avoid error display. The LCD will display OL indicating diode
being tested is open or polarity is reversed. The unit of diode is
Volt (V), displaying the forward voltage drop readings.
• When diode testing has been completed, disconnect the
connection between the testing leads and the circuit under test,
and remove the testing leads away from the input terminals of
the Meter.
E.
Figure 7
