Extech Instruments 407119A Uživatelský manuál stáhnout pdf (Strana 4)

Model 407119 Version 1.3 April 2004

Operation

Initialization and Zero

The meter should always be zeroed at temperature before use. Do not rely on a zero display.

The meter does not display negative numbers.

1. Connect the sensor to the input jack on top of the meter.

2. Turn on the meter using the Power button. The meter will perform a self-test during

which the display will count down from 9999 to 0000.

3. Select the VELOCITY function using the FLOW/VELOCITY button. The LCD will

display VEL when the velocity mode is selected.

4. Select the desired temperature units using the C/F select button. The LCD will reflect

the selection.

5. Select the desired air velocity units using the UNIT button. The LCD will reflect the

selection.

6. Place the sensor cover in the UP (ZERO) position.

7. Place the sensor in the area to be measured and allow a short time for it to reach

temperature.

8. Press the ENTER/RESET button to zero the meter.

Air Velocity Measurements

1. Open the antenna to the desired length.

2. Slide the air velocity sensor cover down.

3. Place the sensor in the air current to be measured. Have the air flow meet the sensor

head in the direction of the white dot on the sensor head.

4. View the air velocity and temperature readings on the LCD Display. The large main

LCD display shows the Air Velocity reading. The lower LCD sub-display shows the

temperature reading.

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Extech Instruments 407119A Uživatelský manuál Strana 4