Extech Instruments MultiTec MT310 User Manual page 13

Diode Test
1. Set the function switch to "
2. Press the "DC/AC" key until the " ..." symbol appears on the display.
3. Insert the black lead into the negative COM jack and the red test lead into the positive jack
4. Touch the test probe tips to the diode or semiconductor junction you wish to test. Note the meter reading.
5. Reverse the test lead polarity by reversing the red and black leads. Note this reading.
6. The diode or junction can be evaluated as follows:
A. If one reading shows a value and the other reading shows OL, the diode is good.
B. If both readings show OL, the device is open.
C. If both readings are very small or 0, the device is shorted.
Frequency / Duty Cycle Measurements
1. Set the function switch to the "HZ" position
2. Insert the black lead into the negative COM jack and the red test lead into the positive Hz jack
3. Touch the test probe tips to the circuit under test.
4. Read the frequency on the display
5. Press the "Hz/Duty" button to display duty cycle in %.
" position.