虽然本书的重点是直流测量，但是要分析噪声和仪器响应速度的问题，就需要简单地讨论一下电子电路中时间和频率的关系。
Although this handbook stresses DC measurements, an analysis of noise and instrument response speed requires a brief discussion of time and frequency relationships in electronic circuits.
详细操作和维护说明及所有电子部件(包括测量点和测试点的部件)的电路图也应一并呈递。
Detailed operating and maintenance instructions and circuit diagrams of all electronic parts on the level of components including measuring and test points shall be also submitted.
介绍了一种直流电机驱动电源和转速测量系统设计方法，并给出了相应的电子电路和软件流程。
The design method of DC motor driving power and rotational speed measuring system is introduced in this paper, and the corresponding electronic circuit and software flow are also given.
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