TECPEL DMM135 Operating Manual page 24

To test a diode out of a circuit, connect the Meter as follows:
1. Insert the red test lead into the VΩmA terminal and the black test lead into the
COM terminal.
2. Set the rotary switch to
button to select diode 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
l
In a circuit, a good diode should still produce a forward voltage drop reading of
0.5V to 0.8V; however, the reverse voltage drop reading can vary depending on
the resistance of other pathways between the probe tips.
l Connect the test leads to the proper terminals as said above to avoid error display.
The LCD will display "OL" indicating open-circuit for wrong connection. The unit
of diode is Volt (V), displaying the positive-connection voltage-drop value.
Model DMM135: OPERATING MANUAL
Measurement Operation (11)
Diode measurement is default or press SELECT
24