Chapter 3 ______________________________________________________ Functional Description
VAISALA_______________________________________________________________________ 31
Users can select the computation of the wind speed extreme values in
one of two ways:
- Traditional minimum/maximum calculation
- 3-second gust & calm calculation recommended by the World
Meteorological Organization (WMO). In this case the highest and
lowest 3-second average values (updated once a second) replace
the maximum and minimum values in reporting of wind speed,
while the wind direction variance is returned in the traditional way.
The transmitter constantly monitors the wind measurement signal
quality. If poor quality is detected, the wind values are marked as
invalid. If over half of the measurement values are considered invalid,
the last valid wind values are returned as missing data. However, in the
SDI-12 protocol, the invalid values are marked as zero (0).
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