UNI-T UT60H, Operating Manual, Page: 23 / 42

Model UT60H: OPERATING MANUAL
23
Measurement Operation(9)
G. Testing Diodes
(see figure 7)
( figure 7)
Warning
To avoid harms to you, please do not attempt to
input voltages higher than 60V DC or 30V rms AC.
To avoid damages to the Meter or to the devices
under test, disconnect circuit power and discharge
all the 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 semicondutor junction, then
measure the voltage drop across the junction. A good
silicon junction drops between 0.5V and 0.8V
To test the diode out of a circuit, connect the Meter
as follows:
1. Insert the red test lead into the
Ω
terminal and
the black test lead into the COM terminal.
2. Set the rotary switch to
Ω
and press SELECT
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 red test lead polarity is “+” while the black
test lead polarity is “-“.
The measured value shows on the display.