9. | Technical data |
|
Measuring interval: | approx.3 min | |
Transmission frequency: | 433.92 MHz | |
Free field range: | max.100 m | |
Indoor temperature range: | ||
External temperature range: | ||
Resolution: | 0.1ºC | |
Accuracy: | .±1ºC | |
Measuring range relative humidity: | 20%- 95% | |
Resolution: | 1% | |
Accuracy: | 8% | |
Air pressure measuring range: | 800 to 1100 hPa | |
Resolution: | 1 hPa | |
Accuracy: | ±1 hPa | |
Rainfall indicator: | 0 to 3,999 mm | |
Resolution: | <0.5 mm | |
Accuracy: | 2 % ±1 mm | |
Brightness display: | 0 to 200000 lux |
Resolution: up to 1 klux:1 lux;up to 10 klux:10 lux;up to/above 100 klux: 0.1/1 klux;
Accuracy: | ±10% ±4Digit | |
Sunshine duration: | 0 to 9999 h | |
Resolution: | up to 100 h:1 min;up to 999 h:1/10 h;above 1000 h:1 h | |
Wind speed: | 0 | |
Resolution: | 0.1 km/h | |
Accuracy: | 3 %±1km/h | |
Wind direction: | graphical resolution 22.5º,numerical resolution 5 degrees | |
Voltage supply: | 4 “C” cell alkaline batteries | |
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Dimensions (W x H x D): | Housing: 10.1” x 8.3” x 1.4” (257 x 211 x 36 mm) |
10.Explanation of terms
WWVB
Perceived temperature -see Wind chill
Dewpoint
Air pressure tendency
Absolute/relative air pressure
As a result of this, a different “weight” of air acts on every area depending upon the mean height above sea level and the height of the column of air above the measuring point. The air pressure at sea level is therefore considerably higher than that in the Himalayan peaks.
In order to provide a reference quantity, in most cases, weather reports either give the absolute air pressure referred to mean sea level (general information, say for a country) or, in the case of more accurate reports, the graduated air pressure represented by means of isobars (the air pressure lines on more accurate weather maps).
In the latter case, one can easily recognize the trend of the air pressure fronts and can find out more about the path of the fronts.
However, as the weather station always measures the absolute air pressure at its location, a correction factor must be defined, which makes it possible to display the difference between absolute and relative air pressure. This is achieved (with this weather station) by entering the accurately known local air pressure (either as notified by the local
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