This text introduces the aim of developing the measuring instrument, its working principle and electric circuit construction.
本文介绍了该测量仪的研制目的、工作原理和电路组成。
About how to obtain and process the signal of fetal heartbeat, I had gave the detail introduction, at the same time, I gave a detailed electric circuit construction.
文中对胎儿心音信号的获得，心音信号的处理进行了详细的介绍，并给出了详细的电路结构。
This paper exemplifies the circuit construction, the function and working principle of the device of control, protect and working state display of electric maching using solid state relay.
介绍了利用固态继电器组成的电机控制、保护、运行状态显示装置的电路组成和工作原理。
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