Sper Scientific 840034 Psychrometer - Anemometer - Manual (Page 9)

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MEASUREMENT PROCEDURES
Air Volume
After you set the outlet size settings, there is a 20 second
wait before you can begin measurement.
During the 20 second waiting period, the count -down num-
ber is displayed on the top left-hand corner. The meter will
beep when the wait time is over.
- OR -
If you prefer not to wait, press
Rec/Start to begin measur-
ing volume right away.
After you begin measuring volume, the meter will au-
tomatically count the volume for 60 seconds to calcu-
late an average value. During this 60 seconds, move
the probe along the entire outlet to cover each part so
the measured data will be more accurate.
The count-down time is displayed on the top left cor-
ner and the meter beeps when 60 seconds is up.