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31 <strong>HID</strong> <strong>Sensor</strong> <strong>Usage</strong>s<br />
can be overridden using explicit Unit and/or Unit Exponent.<br />
Inductance SV – Measures electrical inductance. Default unit of measure is<br />
Henrys; can be overridden using explicit Unit and/or Unit<br />
Exponent.<br />
Resistance SV – Measures electrical resistance. Default unit of measure is<br />
Ohms; can be overridden using explicit Unit and/or Unit<br />
Exponent.<br />
Voltage SV – Measures electrical voltage. Default unit of measure is<br />
Volts; can be overridden using explicit Unit and/or Unit Exponent.<br />
Frequency SV – Measures electrical frequency. Default unit of measure is<br />
Hertz; can be overridden using explicit Unit and/or Unit Exponent.<br />
Period SV – Measures electrical period. Default unit of measure is<br />
milliseconds; can be overridden using explicit Unit and/or Unit<br />
Exponent.<br />
Percent of Range SV – Measures the percent of range provided by a value, such as<br />
the position of a potentiometer with respect to the overall physical<br />
range of that potentiometer. Can be scaled with a Unit Exponent.<br />
1.8 Environmental <strong>Sensor</strong> Field <strong>Usage</strong>s<br />
These fields are commonly supported by environmental sensors.<br />
Atmospheric Pressure SV – Measures atmospheric pressure. Default unit of measure is<br />
bars; can be overridden using explicit Unit and/or Unit Exponent.<br />
Reference Pressure DV – Specifies reference atmospheric pressure at sea level,<br />
nominally “1976 US Standard Atmosphere” air pressure at Sea<br />
Level Pressure. Default unit of measure is bars; can be overridden<br />
using explicit Unit and/or Unit Exponent.<br />
Relative Humidity Percent SV – Measures relative humidity as a percentage.<br />
Temperature SV – Measures temperature. Default unit of measure is degrees<br />
Celsius; can be overridden using explicit Unit and/or Unit<br />
Exponent.<br />
Wind Direction SV – Measures wind direction relative to magnetic north. Default<br />
unit of measure is degrees; can be overridden using explicit Unit<br />
and/or Unit Exponent.<br />
Wind Speed SV – Measures wind speed. Default unit of measure is<br />
meters/second; can be overridden using explicit Unit and/or Unit<br />
Exponent.<br />
1.9 Light <strong>Sensor</strong> Field <strong>Usage</strong>s<br />
These fields are commonly supported by light sensors.<br />
Illuminance SV – Measures illuminance (light level, i.e., luminance per square<br />
area). Default unit of measure is Lux; can be overridden using<br />
explicit Unit and/or Unit Exponent.
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