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Testing Diodes
To avoid possible damage to your multimeter or to the
CAUTION
equipment-under-test, disconnect the circuit power and discharge all
high-voltage capacitors before testing diodes.
Set up your multimeter to test diodes as shown in Figure 2-13. Probe the test
points and read the display.
Table 2-9
– Use the diode test to check diodes, transistors, silicon controlled rectifiers
NOTE
– This test sends a current through a semiconductor junction and then
– Connect the red test lead to the positive terminal (anode) of the diode and
Figure 2-11
Keysight U1241C/U1242C User's Guide
Rotary switch position allowing diode tests
Legend
Defaul t function
Diode test (
(SCRs), and other semiconductor devices. A good diode allows current to
flow in one direction only.
measures the junction's voltage drop. A typical junction drop is 0.3 V to 0.8 V.
the black test lead to the negative terminal (cathode).
Diode display
Function when
)
Capacitance measurement (
Making Measurements
View
is pressed
Shift
Esc
)
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