User Manual

33
UT108/109 OPERATING MANUAL
F. Diode Testing (see gure 9)
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 and
continuity.
To avoid harm to yourselves, never attempt to input an effective voltage over 60V in DC or
30V in AC.
To test a diode out of a circuit, connect the Meter as follows:
1. Insert the red test lead into the 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 polarity of red test lead is “+” while black test lead is “-“.
4. The measured value shows on the display.