User`s guide

2 Making Measurements
Using Auto-diode for Diode Tests
64 U1273A/U1273AX User’s Guide
Using Auto-diode for Diode Tests
Set up your multimeter to test diodes as shown in
Figure 2- 22. Probe the test points, and read the display.
The primary display shows the forward- bias voltage value.
The reverse- bias voltage value is shown in the secondary
display.
• GOOD is shown briefly (along with a single beep) on the
secondary display if the diode is in a good condition.
• NGOOD is shown briefly (along with two beeps) if the
diode is out of the thresholds.
Table 2- 1 3 Rotary switch position allowing auto-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
NOTE
The auto-diode function will help you test both forward- and reverse-bias
directions simultaneously. You do not need to change the measuring
direction to identify the diode’s status.
Table 2- 1 4 Auto-diode voltage thresholds
Forward voltage Reverse voltage Diode status
Primary display Secondary display Good No Good
OL or <0.3 V or >0.8 V –OL or >–0.3 V or <–0.8 V ✘
Within 0.3 V to 0.8 V –OL ✔
OL Within –0.3 V to –0.8 V ✔
NOTE
The open condition will not be alerted as OL on both directions if the
auto-diode function is used.