Caution – Elenco 3 1/2 Digit with Temperature User Manual
Page 23

Testing Diodes
Caution
To avoid possible damage to the meter or to the equipment
under test, disconnect the circuit power and discharge all
high-voltage capacitors before testing diodes.
Use the diode test to check diodes, transistors, silicon controlled
rectifiers (SCRs), and other semiconductor devices. The test sends
a current through a semiconductor junction, then measures the
junction’s voltage drop. A typical junction drops 0.5V to 0.8V.
To test a diode out of a circuit, set up the meter as shown in Figure
11. In a circuit, a similar diode should still indicate a forward-bias
reading of 0.5V to 0.8V; however, the reverse-bias reading can vary
depending on the resistance of other pathways between the probe
tips.
Figure 11. Diode Test
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