Testing Diode; Capacitance Measurement - UNI-T VC820 Operating Manual

VC820/VC840 OPERATING MANUAL
E.

Testing Diode

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, then measures the voltage drop 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 HzV
2. Set the rotary switch to Ω
3. Connect the test leads across with the object being measured.
The measured value shows on the display.
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.
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.
F.

Capacitance Measurement

Warning
Ω
terminal and the black test lead into the COM terminal.
and press SELECT (blue button) to select
16
measurement mode.