Frequency Measurements; Duty Cycle; Contact Temperature Measurements; Auto-Manual Range Selection - Extech Instruments EX330 User Manual

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.
Note: The temperature range of the supplied thermocouple probe is -20 to 250°C (-4
to 482°F)

AUTO-MANUAL RANGE SELECTION

When the meter is first turned on, it automatically goes into the Auto Range mode. This
automatically selects the best range for the measurements being made and is generally the best
mode for most measurements. For measurement situations requiring that a range be manually
selected, perform the following:
1. Press the RANGE key. The AUTO display indicator will turn off.
2. Press RANGE to step through the available ranges until the desired range is selected.
3. To exit the Manual Ranging mode and return to Auto Range, press and hold the RANGE key
for 2 seconds.
Note: Manual range does not apply to Capacitance, Frequency or Temperature modes.
9 EX330-EN v5.0 06/14