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水文缆道测速,一般都是由流速仪接触丝或干簧管发出流速讯号脉冲,通过缆道用“有线”或“无线”的方式,将脉冲讯号传到操作室内,经讯号接收器接收、显示,按流速公式计算出流速值。过去流速仪每20转或5转发出一个流速脉冲讯号,所以讯号频率较低,采用人工听音响计数测速是可行的。但是目前国内外一转一个脉冲讯号,或一转多个脉冲讯号的流速仪开始生产,并在缆道上使用。所以讯号的频率很高,采用人工听音响计数是不可能
Hydrological cableway speed, usually by the flowmeter contact wire or reed pipe issued a signal flow rate pulse, through the cableway with “wired” or “wireless” way, the pulse signal to the operating room, the signal receiver to receive, Display, according to the flow rate formula to calculate the flow rate value. In the past, the flowmeter sent a pulse signal of flow rate every 20 revolutions or 5 revolutions, so the signal frequency was lower. It is feasible to measure the velocity by manual listening sound meter. However, at home and abroad, a current meter with a pulse signal or a pulse signal with more than one pulse starts to be produced and used on a cable way. So the signal frequency is high, the use of artificial listening sound count is impossible