Ambient Weather WS-2902B User Manual page 56

Term
HectoPascals Pressure units in SI (international system) units of measurement. Same as millibars
(hPa) (1 hPa = 1 mbar)
Hygrometer 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.
Inches of Pressure in Imperial units of measure.
Mercury 1 inch of mercury = 33.86 millibars
(inHg)
Rain Gauge A rain gauge is a device that measures liquid precipitation (rain), as opposed to solid
precipitation (snow gauge) over a set period of time.
All digital rain gauges are self emptying or self dumping (also referred to as tipping
rain gauge). The precision of the rain gauge is based on the volume of rain per
emptying cycle.
Range Range is defined as the amount or extent a value can be measured.
Relative Measured barometric pressure relative to your location or ambient conditions.
Barometric
Pressure
Resolution Resolution is defined as the number of significant digits (decimal places) to which a
value is being reliably measured.
Solar A solar radiation sensor measures solar energy from the sun.
Radiation
Solar radiation is radiant energy emitted by the sun from a nuclear fusion reaction
that creates electromagnetic energy. The spectrum of solar radiation is close to that
of a black object with a temperature of about 5800 K. About half of the radiation is
in the visible short-wave part of the electromagnetic spectrum. The other half is
mostly in the near-infrared part, with some in the ultraviolet part of the spectrum.
Thermometer A thermometer is a device that measures temperature. Most digital thermometers are
resistive thermal devices (RTD). RTDs measure changes in temperature as a
function of electrical resistance.
Wind Vane 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
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Definition
Page 56