测深设备是测量水深的航海仪器，也是进行水道测量所必备的工具。
然而现行的大地电磁测深设备的检验办法既缺少整个系统的定量检测，也没有统一规范的技术标准。
But nowadays tests for magnetotelluric surveying equipment can not quantitative detect overall system and there is no uniform technical standards.
本文以实例介绍了此法使用上的特点，并指出利用远参考法进行大地电磁测深时对仪器设备的要求。
This paper explains the special points in using this method by concrete examples, and Outlines the equipment requirement needed in making magnetotelluric sounding by the remote reference method.
回声测深仪是用来测量水深的一种声学测量设备，其以水中超声波的传播速度为确定条件，利用发射波与反射回波时间差来测量水深。
Echo Sounder is a kind of acoustic measuring depth equipment, which can measure depth with the time between transmitted wave and echo on condition in which the speed of ultrasonic is fixed.
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