User's Manual SiteView – Data Logger Software

CHAPTER 11 - WORK WITH UNITSWhat is UnitA Unit is a definite magnitude of a physical quantity, defined and adopted by convention and/or bylaw, that is used as a standard for measurement of the same physical quantity.For example, Temperature is a physical quantity or a Unit Category. The Celsius is a unit ofTemperature that represents a definite predetermined temperature. When we say 25 Celsius (or25°C), we actually mean 25 times the definite predetermined temperature called "Celsius".A unit category may have multiple units associated to it. For example, Fahrenheit and Kelvin areother two units under temperature category and their relationships are:Fahrenheit = 1.8 * Celsius + 32Kelvin = Celsius + 273In the SiteView system, each unit category can have only one primary unit. In the above example,Celsius is defined as the primary unit. Only the primary unit has its slop = 1 and intercept = 0. Allother units under the same unit category relate to the primary unit.In SiteView system, each unit category can have one user selectable default unit. For example, if youare in the United States you may choose Fahrenheit as your default unit.The following tables specify the SiteView built-in units for some unit category:Temperature Category:Unit Slop InterceptCelsius 1 0Fahrenheit 1.8 32Kelvin 1 273Voltage Category:Unit Slop InterceptVolt 1 0Killovolt 0.001 0Millivolt 1000 0Microvolt 1000000 0Current Category:Unit Slop InterceptAmp 1 0Milloamp 1000 0SiteView User’s Manual – Microedge Instruments Inc. 81/200