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5
Glossary of Terms
Term
Accuracy
Hygrometer
Range
Resolution
Absolute Barometric
Pressure
Relative Barometric
Pressure
HectoPascals (hPa)
Inches of Mercury (inHg)
6 Specifications
6.1 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.
Version 2.0
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.
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.
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
20
Page
Definition
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