Ambient Weather OBSERVER WS-1002-ARRAY Gebruikershandleiding - Pagina 13
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which include passing through barriers or walls.
4. Metal Barriers. Radio frequency will not pass through metal barriers such as aluminum
siding. If you have metal siding, align the remote and console through a window to get a clear
line of sight.
The following is a table of reception loss vs. the transmission medium. Each "wall" or obstruction
decreases the transmission range by the factor shown below.
Medium
Glass (untreated)
Plastics
Wood
Brick
Concrete
Metal
5. Glossary of Terms
Term
Absolute
Absolute pressure is the measured atmospheric pressure and is a function of altitude,
Barometric
and to a lesser extent, changes in weather conditions.
Pressure
Absolute pressure is not corrected to sea-level conditions. Refer to Relative
Barometric Pressure.
Accuracy
Accuracy is defined as the ability of a measurement to match the actual value of the
quantity being measured.
Barometer
A barometer is an instrument used to measure atmospheric pressure.
Calibration is a comparison between measurements – one of known magnitude or
Calibration
correctness of one device (standard) and another measurement made in as similar a
way as possible with a second device (instrument).
Dew Point
The dew point is the temperature at which a given parcel of humid air must be
cooled, at constant barometric pressure, for water vapor to condense into water. The
condensed water is called dew. The dew point is a saturation temperature.
The dew point is associated with relative humidity. A high relative humidity
indicates that the dew point is closer to the current air temperature. Relative
humidity of 100% indicates the dew point is equal to the current temperature and the
air is maximally saturated with water. When the dew point remains constant and
temperature increases, relative humidity will decrease.
Heat Index
The Heat Index, sometimes referred to as the apparent temperature, is a measure of
how hot it really feels when relative humidity is factored with the actual air
temperature.
To find the Heat Index temperature, look at the Heat Index chart below. As an
example, if the air temperature is 96°F and the relative humidity is 65%, the heat
index (how hot it feels) is 121°F.
IMPORTANT: Since heat index values were devised for shady, light wind
conditions, exposure to full sunshine can increase heat index values by up to 15°F.
Version 2.1
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RF Signal Strength Reduction
5-15%
10-15%
10-40%
10-40%
40-80%
90-100%
Definition
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