Extech Instruments AN100-NIST User Manual page 6

Air Flow Measurements (CMM / CFM)
1. Turn on the meter using the
Press the UNITS button to select the desired air flow units: CMM
2.
(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
button until it beeps twice. The leftmost digit of the bottom
display will begin to flash.
Use the ▲ (UP) button to change the flashing digit
4.
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 NEXT 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 NEXT to scroll thru the 8 memory locations. Press and hold the AREA button until it beeps
twice to return to CFM or CMM measuring mode.
ON/OFF button
2 2
or ft , press and hold the AREA
6
Side view of Vane
Arrow
airflow
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