Extech Instruments AN200 User Manual page 7

Air Flow Measurements (CMM / CFM)
1. Turn on the meter using the
2. Press the UNITS button to select the desired air flow
units: CMM (cubic meters per minute) or CFM (cubic
feet per minute). NOTE: At power up the meter will
display the last unit of measure previously entered.
3. To begin entering the area in m
hold the AREA button until it beeps twice. The
leftmost digit of the bottom display will begin to flash.
4. Use the ▲ (UP) button to change the flashing digit
Use the ◄ (LEFT) button to move the decimal
Use ► (RIGHT) button to select the other digits.
After all of the digits are entered, press and hold the
AREA button (until meter beeps twice) to save the
area into memory and return to CFM or CMM
measuring mode.
5. Place the sensor in the air stream. Ensure that the air enters the vane as indicated by
the arrow sticker placed inside the vane. Refer to the diagram. The large main LCD
display shows the Air Velocity reading. The upper right LCD sub-display shows the
temperature reading.
The meter has 16 memory locations (8 for CFM and 8 for CMM) that can be used to store
commonly used area sizes that you can recall at anytime.
1. Press the AREA button until meter beeps twice. A memory location number will
appear in the top right of the display indicating the memory location.
2. Push the AREA button to scroll thru and select the desired location. Once you have
selected the desired memory location enter your dimension
Use the ▲ (UP) button to change the flashing digit
Use the ◄ (LEFT) button to move the decimal
Use ► (RIGHT) button to select the other digits. After all of the digits are entered,
press and hold the AREA button (until it beeps twice) to save the area into memory
and return to CFM or CMM measuring mode.
To select and use a previously stored dimension, press and hold the AREA button until it
beeps twice.
Press AREA to scroll thru the 8 memory locations. Press and hold the AREA button until it
beeps twice to return to the CFM or CMM.measuring mode.
Air Flow Measurements (Up to 20 Point averaging)
1. To enter 20 Point Averaging Mode, press and hold the AVG button until it beeps twice.
The AVG icon will be displayed.
2. Take a measurement and press the AVG button. A single beep will sound and the
HOLD icon will appear in the display.
3. The average reading will be displayed and number of readings measured will appear in
the upper right hand corner of the display. After 5 seconds, the display will return to the
current reading. (IMPORTANT: Please note that the average readings are only held for
5 seconds and cannot be recalled.)
4. Repeat steps 2 - 3 until all desired points have been measured.
5. Press the AREA button to clear the multipoint averaging memory.
6. To return to standard airflow measuring mode press and hold AVG button until meter
beeps twice.
ON/OFF button
2 2
or ft , press and
7
Side view of Vane
Arrow
airflow
AN200 V2.1 05/07