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10 Glossary of Terms
Accuracy is defined as the ability of a measurement to match the
actual value of the quantity being measured.
A hygrometer is a device that measures relative humidity. Relative
humidity is a term used to describe the amount or percentage of
water vapor that exists in air.
Range is defined as the amount or extent a value can be measured.
Resolution is defined as the number of significant digits (decimal
places) to which a value is being reliably measured.
A wind vane is a device that measures the direction of the wind. The
wind vane is usually combined with the anemometer. Wind direction
is the direction from which the wind is blowing.
Absolute Barometric
Pressure
Relative barometric pressure, corrected to sea-level. To compare
pressure conditions from one location to another, meteorologists
correct
pressure to sea-level conditions. Because the air pressure decreases
as
you rise in altitude, the sea-level corrected pressure (the pressure
your
location would be at if located at sea-level) is generally higher than
your
measured pressure.
Relative Barometric
Pressure
Measured barometric pressure relative to your location or ambient
conditions.
Pressure units in SI (international system) units of measurement.
Same
as millibars (1 hPa = 1 mbar)
Pressure in Imperial units of measure.
1 inch of mercury = 33.86 millibars
11 Specifications
11.1 Wireless Specifications
Line of sight wireless transmission (in open air): 300 feet, 100 feet under most conditions
Frequency: 433 MHz
Update Rate: 60 seconds for rain sensor and thermo-hygrometer sensor, 16 seconds for wind
sensor.
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