Vaisala WXT520 - Manual (Page 165)

Appendix D ________________________________________ Wind Measurement Averaging Method
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APPENDIX D
WIND MEASUREMENT AVERAGING
METHOD
The following three figures represent the wind measurement averaging
for different selections of communication protocol, wind measurement
update interval (I) and averaging time (A). Scalar averaging is used for
both wind speed and direction.
NOTE Grey boxes indicate that the measurement is in progress during the
corresponding second.
Update (= internal calculation) is always made in the end of the update
interval.
In the auto sending protocols (ASCII automatic (+ CRC) and NMEA
automatic) outputting the data messages is synchronized to take place
immediately after the update.
In ASCII polled (+ CRC), NMEA query and SDI-12 continuous
measurement protocols trying to request data before the update
interval is completed will result in getting the data from the previous
completed update interval.
Wind measurement sampling rate (4, 2, or 1 Hz) does not have any
effect on the averaging scheme. It determines from how many samples
the one second values seen in the figures are calculated.