Resistance Measurements; Temperature Measurements; Continuity Measurements; Diode Measurements - Extech Instruments MN35 User Manual

Resistance Measurements
1. Insert the black test lead banana plug into the negative COM jack and the red test lead banana
plug into the positive V//mA jack.
2. Set the function switch to the highest position.
3. Touch the test probe tips across the circuit or part under test. It is best to disconnect one side of
the part under test so the rest of the circuit will not interfere with the resistance reading.
4. Read the resistance in the display and then set the function switch to the lowest position that is
greater than the actual or any anticipated resistance.
Temperature Measurements
WARNING: To avoid electric shock, disconnect test leads from any source of voltage before
making a temperature measurement. Be sure that the thermocouple has been removed before
changing to any other measurement function.
1. Insert the type K thermocouple probe into the V//mA and COM jacks.
2. Turn the rotary switch to the
3. Read the temperature on the display.
Continuity Measurements
1. Insert the black test lead banana plug into the negative COM jack and the red test lead banana
plug into the positive V//mA jack. Observe polarity.
2. Turn the rotary switch to the •))) position.
3. Touch the test probes to the circuit or device under test. If the resistance is less than
approximately 40 the buzzer will sound.
Diode Measurements
1. Insert the black test lead banana plug into the negative COM jack and the red test lead banana
plug into the positive V//mA jack.
2. Turn the rotary switch to the •))) position.
3. Touch the test probes to the diode under test. Forward voltage will indicate 0.4V to 0.7V.
Reverse voltage will indicate "1. ". Shorted devices will indicate near 0mV and an open device
will indicate "1. " in both polarities.
Battery Test
1. Insert the black test lead banana plug into the negative COM jack and the red test lead banana
plug into the positive V jack.
2. Turn the rotary switch to the 1.5V or 9V BAT position.
3. Connect the red test lead to the positive side of the 1.5V or 9V battery and the black test lead to
the negative side of the 1.5V or 9V battery.
4. Read the voltage in the display.
Data Hold
Press the Hold button to freeze the reading in the display. "H" will appear in the LCD. Press the
key again to release the display.
o o
F or C position.
Good
9V battery: >8.2V
1.5V battery: >1.35V 1.22 to 1.35V <1.22V
Weak
7.2 to 8.2V <7.2V
4
Bad
MN35-EU-EN V2.3 4/13