Abstract
Entirestation type electronic speed measuring instrument is a kind of both automatic and Angle measurement, calculation and automatic recording and transmitting data. Automatic and digital 3d coordinate measurement and positioning system. It consists of photoelectric rangefinder unit, electronic measuring Angle and microprocessors.Unit, and electronic records unit, is a widely applied to control measure, topographic survey, cadastral and property measurement, the measurement and offshore orientation of industrial electronic measurement instruments. According to the structure, can be divided into two integral and building blocks. The former is the will and Angle measurement and electronic calculating unit and the optical instruments with mechanical system designed to overall, The latter by independent photoelectric theodolite with head, electronic range of electronic calculating unit.Entirestation type electronic speed measuring instrument and say "electronic electronic tachometer" (ElectornicTotalStation), referred to as "total".Part of the electronic tachometer Angle measurement accuracy level of nominal standard deviation in instrument.
Keywords：distance; Angle measuring; Nominal standard deviation
