ECOWITT HP2551, Руководство по эксплуатации, Страница: 72 / 90

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pressure (the pressure your location would be at if located at
sea-level) is generally higher than your measured pressure.
Thus, your absolute pressure may read 28.62 inHg (969 mb) at an
altitude of 1000 feet (305 m), but the relative pressure is 30.00 inHg
(1016 mb).
The standard sea-level pressure is 29.92 in Hg (1013 mb). This is
the average sea-level pressure around the world. Relative pressure
measurements greater than 29.92 inHg (1013 mb) are considered
high pressure and relative pressure measurements less than 29.92
inHg are considered low pressure.
To determine the relative pressure for your location, locate an
official reporting station near you (the internet is the best source for
real time barometer conditions, such as Weather.com or
Wunderground.com), and set your weather station to match the
official reporting station.
(4) Only use this if you improperly installed the weather station sensor
array, and did not point the direction reference to true north.
(5) The default conversion factor based on the wavelength for bright
sunlight is 126.7 lux / w/m
2
. This variable can be adjusted by
photovoltaic experts based on the light wavelength of interest, but
for most weather station owners, is accurate for typical applications,
such as calculating evapotransporation and solar panel efficiency.
(6) Wind speed is the most sensitive to installation constraints. The rule
of thumb for properly installing a wind speed sensor is 4 x the
distance of the tallest obstruction. For example, if your house is 20’
tall and you mount the sensor on a 5’ pole:
Distance = 4 x (20 – 5)’ = 60’ or =4 x (6.10-1.52)=18.32m.