GW Instek GDM-350A - Manual (Page 23)

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across the junction. A good silicon junction
drops between 0.5V and 0.8V.
To test a diode out of a circuit, connect the Meter as follows:
1. Insert the red test lead into the V Ω mA terminal and the black test lead into the
COM terminal.
2. Set the rotary switch to
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.
Measurement Operation (11)
Model GDM-350A: OPERATING MANUAL