Measurement Operation (8)
E.
Testing Diodes
(see figure 10)
(figure 10)
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
V
Hz
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.
black
red
Model UT70C: OPERATING MANUAL
23
