Agilent Technologies U1231A Guía de usuario descargar pdf (Pagina 63)

Making Measurements 2

Testing Diodes

U1231A/U1232A/U1233A User’s Guide 45

Tes ting Diode s

Set up your multimeter to test diodes as shown in

Figure 2- 14. Probe the test points and read the display.

Figure 2-12 Diode display

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.

• 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.

NOTE

Your multimeter can display the forward bias of a diode up to

approximately 2.1 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.

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Agilent Technologies U1231A Guía de usuario Pagina 63