回声测深仪记录笔转速的准确与稳定,是保证测深成果正确的关键因素之一。在测深仪中都设有转速测量装置。国内常用的测深仪测速装置有:测速指示灯、转速计、机械计数器等。但这些装置测速有几个共同的 Echo sounder recording pen speed accuracy and stability, is one of the key factors to ensure the sounding sounding results. In the depth sounder are equipped with speed measurement device. Domestic sounder anemometer speed devices are: speed indicator light, tachometer, mechanical counters and so on. But there are several common velocities for these devices