Measuring Diodes - UNI-T UT58A Operating Manual

Warning
To avoid damage to the Meter or to the equipment
under test, disconnect circuit power and discharge
all high-voltage capacitors before measuring diodes.
To avoid harms to you, please do not attempt to input
voltages higher than 60V DC or 30V rms AC.
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 0.5V and 0.8V
To test out a diode out of a circuit, connect the Meter as
follows:
1. Insert the red test lead into the Hz V
V (UT58A/UT58B) 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.
Model UT58A/B/C: OPERATING MANUAL
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19
(UT58C) or