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随着水文缆道系统数字测量技术的发展,缆道使用越来越多,但现有的缆道中,很多缆道都不能正常使用,造成的原因很多,根据长期的实践,我认为主要是由三个方面的原因造成的: 1.对水下信号源的输出电压幅度和波形V信没有统一标准,这就造成有的信号源输出是方波,有的是正弦波,也有的是不规则的波形。如果是方波和正弦波只要幅度足够,还是可以正常工作的;如果是不规则的波形,则不但不能正常工作,还要严重地干扰岸上的测量仪器,使之错误动作,造成整个系统不能正常工作,所以对水下信号源要有严格的要求。主要的要求是:(1)输出一定要是方波或正弦波,决不能是其它不规则的波形。(2)根据不同缆道输出电压的幅度应该
With the development of digital measurement techniques for hydrological cableway systems, more and more cableways are used, but many existing cableways are not functioning properly for many reasons. According to long-term practice, I think it is mainly caused by Three reasons: 1. The underwater signal source output voltage amplitude and waveform V letter there is no uniform standard, which resulted in some signal source output is a square wave, some are sine wave, and some irregular wave. If it is square wave and sine wave as long as the amplitude is sufficient, or can work properly; if it is irregular waveform, then not only can not work properly, but also seriously interfere with the shore of the measuring instruments, so that the wrong action, resulting in the system can not be normal Work, so have strict requirements on underwater signal source. The main requirements are: (1) the output must be a square wave or sine wave, must not be other irregular waveforms. (2) Depending on the width of the different cable output voltage should be