Major tech MT 770 Manual de instruções - Página 16

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1. Ac Current Measurement

13. DIODE TEST

1. Set the function switch to

position.

2. Press the

Test range. The meter automatically defaults to

Resistance.

3. Insert the red test lead into the "V Ω ºC ºF HZ"

input terminal and the black lead to the "COM"

terminal.

4. Connect the other end of the test leads to the

component under test. Read the display.

Note:• Use the diode test to check diodes,

Transistors, silicon controlled rectifiers

(SCR's) and other semiconductor devices.

• The test sends a current through a

semiconductor junction, then measures

the junction's voltage drop.

• Normal forward voltage drop (forward bias)

for a good silicon diode is between 0.4V to

0.9V. A reading higher than that indicates

a leaky (defective) diode. A zero reading

indicates a shorted diode.

• Reverse the test leads connection (reverse

bias) across the diode. The display shows

"OL" if the diode is good. Any other

readings indicate the diode is shorted or

resistive (defective).

MODE

button to select the Diode

Diode

range