Ambient Weather WS-2000 User Manual page 53

Parameter Type of
Calibration
Temperature Offset
Humidity Offset
ABS Offset
Barometer
REL Barometer Offset
Wind Direction Offset
Solar Radiation Gain
2
1 w/m Gain
Wind Gain
Rain Gain
Daily Rain Offset
Weekly Rain Offset
Monthly Rain Offset
Yearly Rain Offset
(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) and
possible calibration errors (many official weather stations are not properly installed and
calibrated).
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 tablet to match the fluid thermometer.
(2) Humidity is a difficult parameter to measure electronically and drifts over time due to
contamination. In addition, location has an adverse effect on humidity readings (installation
over dirt vs. lawn for example).
Official stations recalibrate or replace humidity sensors on a yearly basis.
manufacturing tolerances, the humidity is accurate to ± 5%. To improve this accuracy, the
indoor and outdoor humidity can be calibrated using an accurate source, such as a sling
Version 2.12
Default
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Typical Calibration Source
Current Value Red Spirit or Mercury
Thermometer (1)
Current Value Sling Psychrometer (2)
Current Value Calibrated laboratory grade
barometer
Current Value Local airport (3)
Current Value GPS, Compass (4)
1.00 Calibrated laboratory grade
solar radiation sensor
126.7 lux Solar radiation conversion
from lux to w/m
wavelength correction (5)
1.00 Calibrated laboratory grade
wind meter (6)
1.00 Sight glass rain gauge with an
aperture of at least 4" (7)
Current Value Apply an offset if the weather
station was not operating for
the entire day.
Current Value Apply an offset if the weather
station was not operating for
the entire week.
Current Value Apply an offset if the weather
station was not operating for
the entire month.
Current Value Apply an offset if the weather
station was not operating for
the entire year.
2
for
Due to
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