User's Manual

Page 20
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.
C3:Wind Gain Calibration
Select calibration value and tap
, then enter wind speed calibration factor from: 75% to 125%
The default is 100%.where:
Calibrated Wind Speed = Calibration factor x Measured Wind Speed
Note: The wind gust is also affected by the wind speed calibration factor.
Discussion: Wind speed and wind gust are adversely affected by installation constraints. The rule of
thumb is to install the weather station four times the distance of the height of the tallest obstruction (for
example, a 6 m house would require an installation 24 m away).
In many instances, due to trees and other obstructions, this is not possible. The wind speed calibration allows
you to correct for these obstructions.
In addition to installation challenges, wind speed bearings (any moving part) wears over time. To correct for
wear, the correction value can be increased until the wind cups must be replaced.
Without a calibrated source, wind speed is a difficult parameter to measure. We recommend using a calibrated
wind meter and constant, high speed fan.
Select calibration value and tap
, then enter wind direction offset rang: 0 to 359 degree, The
default is 0.
C4:Rain Calibration
Select calibration value and tap
, then enter rainfall calibration factor from: 75% to 125% The
default is 100%., where:
Calibrated Rain = Calibration factor x Measured Rain
Discussion: The rain collector is calibrated at the factory based on the funnel diameter. The bucket tips
every 0.01” of rain (referred to as resolution). The accumulated rainfall can be compared to a sight glass rain
gauge with an aperture of at least 4”.
Note: that debris and insects can collect inside the tipping mechanism (they make a good spiders nest).
Carefully remove the funnel and inspect the tipping mechanism for debris prior