User`s guide

Making Measurements 2
Testing Diodes
U1273A/U1273AX User’s Guide 61
Reverse the probes (as shown in Figure 2- 23) and measure
the voltage across the diode again. Assess the diode
according to the following guidelines:
• A diode is considered good if the multimeter displays
OL in reverse- bias mode.
• A diode is considered shorted if the multimeter
displays approximately 0 V in both forward- and
reverse- bias modes, and the multimeter beeps
continuously.
• A diode is considered open if the multimeter displays
OL in both forward- and reverse- bias modes.
Figure 2-21 Open diode display
NOTE
• Your multimeter can display diode forward-bias of up to approximately
3.1 V. The forward-bias of a typical diode is within the range of 0.3 V to
0.8 V; however, the reading can vary depending on the resistance of
other pathways between the probe tips.
• If the beeper is enabled during diode test, the multimeter will beep
briefly for a normal junction and sound continuously for a shorted
junction, below 0.050 V. See “Changing the beep frequency” on
page 120 to disable the beeper.