ECOWITT WH2910, Operation Manual

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Parameter Type of
Calibration
Default Typical Calibration Source
Temperature Offset Current Value Red Spirit or Mercury
Thermometer (1)
Humidity Offset Current Value Sling Psychrometer (2)
ABS
Barometer Offset Current Value Calibrated laboratory grade
barometer
REL
Barometer Offset Current Value Local airport (3)
Wind
Direction Offset Current Value GPS, Compass (4)
Wind Gain 1.00 Calibrated laboratory grade
wind meter (5)
Rain Gain 1.00 Sight glass rain gauge with
an aperture of at least 4” or
0.1m (6)
Table 6: Calibration parameter summarization
(1) Temperature errors can occur when a sensor is placed too close to a heat
source (such as a building structure, the ground or trees).
To calibrate temperature, we recommend a mercury or red spirit (fluid)
thermometer. Bi-metal (dial) and digital thermometers (from other weather
stations) are not a good source and have their own margin of error. Using a
local weather station in your area is also a poor source due to changes in
location, timing (airport weather stations are only updated once per hour).
Place the sensor in a shaded, controlled environment next to the fluid
thermometer, and allow the sensor to stabilize for 48 hours. Compare this
temperature to the fluid thermometer and adjust the console to match the
fluid thermometer.