3.3.1 Scalar Averaging
When you select scalar averaging, WMT700 calculates wind speed and direction averages
by adding up each wind measurement from the averaging time and dividing the sum by the
number of measurements. The time between each consecutive wind speed and wind
direction measurement is 0.25 seconds.
Wind direction is a circular function with a discontinuity at North, where 360° is equal to 0°.
For example:
359° + 5° = + 4°
0° - 5° = 355°
WMT700 translates wind direction to a linear function to determine the wind direction
average. For example:
359° + 5° is translated to 364°, which is then further converted to +4° for output.
0° - 5° is translated to 355°.
This ensures that the wind direction average stays representative of the true situation even if
individual samples occur on both sides of the zero direction.
If the data acquisition system requests data before the initial averaging time completes, the
sensor returns the most recent complete measurement data.
The following
figure shows an example of averaging wind direction when the measured
wind values are 355° and 10°. The resulting average is 2.5°.
WMT700 User Guide M211095EN-H
36
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