Ambient Weather WS-108 Uživatelský manuál stáhnout pdf (Strana 32)

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)

Solar Radiation

Gain

1.00

Calibrated laboratory grade

solar radiation sensor

1 w/m

Gain

126.7 lux

Solar radiation conversion

from lux to w/m

for

wavelength correction (5)

Gain

1.00

Calibrated UV sensor (6)

Wind

Gain

1.00

Calibrated laboratory grade

wind meter (7)

Rain

Gain

1.00

Sight glass rain gauge with an

aperture of at least 4” (8)

Daily Rain

Offset

Current Value

Apply an offset if the weather

station was not operating for

the entire day.

Weekly Rain

Offset

Current Value

Apply an offset if the weather

station was not operating for

the entire week.

Monthly Rain

Offset

Current Value

Apply an offset if the weather

station was not operating for

the entire month.

Yearly Rain

Offset

Current Value

Apply an offset if the weather

station was not operating for

the entire year.

(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 console 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 affect on humidity readings (installation

over dirt vs. lawn for example).

Official stations recalibrate or replace humidity sensors on a yearly basis. Due to

manufacturing tolerances, the humidity is accurate to ± 5%. To improve this accuracy, the

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