17
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 measure 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 then 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).
15.
CONTINUITY TESTING
1.
Set the function switch to
range position.
2.
Press the
button to select the Continuity Test range. The meter automatically defaults to
Resistance.
3.
Insert the red test lead into the
input terminal and the black lead to the
terminal.
4.
Short the tip of the test leads and make sure the display reads “)” and the buzzer beeps.
5.
Connected the tip of the test leads to the circuit or component under test. The display reads the
resistance and the buzzer beeps when the reading is no more than about 350.
