Elenco 3 1/2 Digit with Temperature Manual do Utilizador descarregar pdf (Página 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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Elenco 3 1/2 Digit with Temperature Manual do Utilizador Página 23