Extech Instruments EX330 User Manual page 9

CAPACITANCE MEASUREMENTS
WARNING: To avoid electric shock, disconnect power
to the unit under test and discharge all capacitors
before taking any capacitance measurements.
Remove the batteries and unplug the line cords.
1. Set the rotary function switch to the CAP
position.
2. Insert the black test lead banana plug into the
negative COM jack.
3. Insert the red test lead banana plug into the
positive CAP jack.
4. Touch the test leads to the capacitor to be
tested.
5. The test may take up to 3 minutes or more for
large capacitors to charge. Wait until the
readings settle before ending the test.
6. Read the capacitance value in the display
FREQUENCY MEASUREMENTS
1. Use the MODE button to view the Hz unit of
measure on the LCD display.
2. Insert the black test lead banana plug into the
negative COM jack and the red test lead
banana plug into the positive Hz jack.
3. Touch the test probe tips to the circuit under
test.
4. Read the frequency on the display.
% DUTY CYCLE
1. Set the rotary function switch to the Hz/%
position.
2. Use the MODE button to view the % unit of
measure on the LCD display.
3. Insert the black lead banana plug into the
negative COM jack and the red test lead banana
plug into the positive Hz jack.
4. Touch the test probe tips to the circuit under test.
5. Read the % duty cycle on the display.
CONTACT TEMPERATURE MEASUREMENTS
1. Set the function switch to the ºF or ºC position.
2. Insert the Temperature Probe into the input jacks, making
sure to observe polarity.
3. The probe can be pressed against a device under test to
read its temperature or the probe can be held in air to read
the ambient temperature. Allow 30 seconds for the display
to stabilize.
4. Read the temperature in the display.
9 Model EX330 - Version 4.0 – 05/06