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Press and hold the [+] or [-] button for three seconds to increase or decrease rapidly.
Press the ALARM button to reset current value.
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, if the building is 20ft tall, and the mounting pole is 6ft tall, install 4 x (20 – 6) ft = 56ft 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.
4. Rain Calibration
Press the SET button again and the Rain Calibration value will begin flashing (the default is 1.0). Press the [+]
or [-] button to adjust the rain calibration factor from 0.75 to 1.25, where:
Calibrated Rain = Calibration factor x Measured Rain
Press and hold the [+] or [-] button for three seconds to increase or decrease rapidly.
Press the ALARM button to reset current value.
Discussion: The rain collector is calibrated at the factory based on the funnel diameter. The bucket tips
every 0.01 inch 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 inches.
Note: Debris and insects can collect inside the tipping mechanism (they make a good spider’s nest).
Carefully remove the funnel and inspect the tipping mechanism for debris prior to calibration.
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