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Model UT107: OPERATING MANUAL
E. Diode Testing (see figure 7)
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.
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.
Insert the red test lead into the terminal and the
black test lead into the COM terminal.
Set the rotary switch to .
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 “-“.
The measured value shows on the display.
1.
2.
3.
( figure 7)
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:
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