Operation - Extech Instruments AN500 User Manual

Operation

Initialization and Zero
The meter should always be zeroed at temperature before use using the ZERO button. Do not
rely on the initial zero display.
Notes:
The meter does not display negative numbers.
Open antenna to desired length.
1. Connect the sensor to the input jack on top of the meter and open antenna to desired length.
2. Switch the meter ON using the Power button.
3. Select the desired temperature units by holding in the C/F select button. The LCD will reflect the
selection.
4. Select the desired air velocity units using the UNIT button. The LCD will reflect the selection.
5. Place the sensor in the area to be measured and allow a short time for the sensor to reach the
temperature of the air under test.
6. Press and hold the ZERO button for 1 second to zero the meter.
Taking Air Velocity Measurements
1. Zero the meter as described above.
2. Place the sensor in the air current to be measured. Have the air flow in the direction against the
white dot shown on the top of the sensor head.
3. View the air velocity and temperature readings on the LCD Display. The top LCD display
indicates the Air Velocity reading. The lower LCD display indicates the temperature reading.
MAX/MIN Function
1. To begin capturing the Minimum (MIN), Maximum (MAX), and Average (AVG) readings, press
the MAX-MIN button momentarily. The MAX, MIN, and AVG icons will appear on the LCD
(flashing on and off).
2. Take readings as described previously.
3. Press MAX/MIN button again to stop recording.
4. The MAX-MIN-AVG display screens will automatically scroll from one to the next showing the
highest (MAX), lowest (MIN), and average (AVG) readings captured since the MAX-MIN button
was first pressed.
5. Press the MAX-MIN button again to continue recording. The MAX, MIN, and AVG icons will
continue flashing.
6. Press and hold the MAX-MIN button for 1 second to exit the MAX-MIN mode and return to the
normal operating screen. The MAX-MIN-AVG readings will be reset.
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