C. Testing Diodes

 (see figure 5)

Warning

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:

Insert the red test lead into the Hz Duty%

terminal and the black test lead

into the 

COM

 terminal.

1.

(figure 5)

Red

Black

Model UT203/204: OPERATING MANUAL

22