This sensor has a 16 pole AC tachogenerator which outputs a square wave with a speed constant of approximately 2.5 Hz per Knot. The encoder makes it possible to read low wind speeds very accurately, by increasing theintegration time.
产品详细信息:http://www.vibtel.com/CN/Products/MeteorologicalInstruments/WindSpeedandDirection/MTECH.Model%20911-WS.html