Frequency Measurements; Duty Cycle; Contact Temperature Measurements - Extech Instruments EX420-NIST User Manual

FREQUENCY MEASUREMENTS

1. Set the rotary function switch to the green "Hz" position.
2. Insert the black 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. Insert the black lead banana plug into the negative COM jack and
the red test lead banana plug into the positive Hz jack.
3. Press the SELECT key momentarily to select % in the display.
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 black Type K ºC or ºF position.
2. Insert the Temperature Probe into the input jacks, making sure to observe the correct polarity.
3. Touch the Temperature Probe head to the part whose temperature you wish to measure. Keep the
probe touching the part under test until the reading stabilizes (about 30 seconds).
4. Read the temperature in the display.
Note: The temperature probe is fitted with a type K mini connector. A mini connector to
banana connector adaptor is supplied for connection to the input banana jacks.
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EX420-EU-EN v3.3 08/13