Testing Diodes - UNI-T UT81C Operating Manual

Model UT81C: OPERATING MANUAL
Warning
To avoid harms to you, please do not attempt to
input voltages higher than 60V DC or 42V 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, set up the Meter as
Figure 3-7 and proceed as follows:
Figure 3-7. Diode Test
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