User`s guide

2 Making Measurements
Testing Diodes
60 U1273A/U1273AX User’s Guide
Tes ting Diodes
Set up your multimeter to test diodes as shown in
Figure 2- 22. Probe the test points, and read the display.
Figure 2-20 Diode display
Table 2- 1 2 Rotary switch position allowing diode tests
Legend Default function Function when is pressed
Diode test Auto-diode test
S
h
i
f
t
V
i
e
w
E
s
c
Auto
CAUTION
To avoid possible damage to your multimeter or to the equipment under
test, disconnect the circuit power and discharge all high-voltage
capacitors before testing diodes.
NOTE
• Use the diode test to check diodes, transistors, silicon controlled
rectifiers (SCRs), and other semiconductor devices. A good diode
allows current to flow in one direction only.
• This test sends a current through a semiconductor junction, and then
measures the junction’s voltage drop. A typical junction drops 0.3 V to
0.8 V.
• Connect the red test lead to the positive terminal (anode) of the diode
and the black test lead to the negative terminal (cathode). The cathode
of a diode is indicated with a band.