General-tools-and-instruments GT310 Manual de usuario descargar pdf (Pagina 14)

CHECKING THE INTEGRITY OF A DIODE

OR THE CONTINUITY OF A CIRCUIT

Before checking a diode or checking for continuity, be sure to remove

power from the circuit under test.

Turn the rotary dial to the

Ω position. With the symbol MΩ at the right

of the display, briefly press the

Select/0-9

button once to call up the

diode symbol .

Connect the red test lead to the anode (positive terminal) of the diode

to be tested, and the black test lead to its cathode (negative terminal).

Read the forward bias voltage value on the display. A typical silicon

diode has a forward bias voltage between 0.7 and 0.99V. A typical

germanium diode has a forward bias voltage between 0.3 and 0.36V.

A 0V reading in both directions indicates a shorted diode. An OL

reading indicates an open diode. In either case, the diode is defective

and should be replaced. An OL reading also may indicate that the

polarity of the test leads is reversed. This test can be used to

distinguish the anode and cathode of a diode.

To enter Continuity Check mode, briefly press the

Select/0-9

button

once with the diode symbol showing on the display. This will

change the diode symbol to the

Ω unit. If the icon is not visible at

the right of the display, activate the beeper by pressing the Buzzer

button.

In Continuity Check mode, the initial reading will be

. Touch the test

leads to any two points in the circuit. If the resistance between the

points is <30

Ω, the meter will produce a long beep.

MEASURING DC OR AC CURRENT

F! The circuit to be tested may not carry a voltage in excess of

1000VDC or 750VAC. Applying a current of >500 mA will blow the fuse

in the red test lead. To remove the fuse, unscrew the top of the red

lead. Replace the blown fuse with a fast-acting ceramic fuse with a

rating of 500mA/500V.

Turn the rotary dial to the uA or mA position, depending on the

expected amplitude. The unit uA or mA will appear at the right of the

display. The word AUTO will appear at the top left, indicating that the

meter is in Auto ranging mode.

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General-tools-and-instruments GT310 Manual de usuario Pagina 14

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