When periodic signals are analyzed in the laboratory, we measure the frequency spectrum of signals usually by a selection level meter.

在实验室进行周期信号分析时，通常使用选频电平表来测量其频谱。

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This paper introduces the level meter selection procedure in Hangzhou Refinery, aswell as the application of steel belt level meter.

介绍了杭州炼油厂液位仪表的选择，以及钢带液位计的应用情况。

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The paper elaborately introduces the working principle and characteristic of the radar fluid-level meter, the composition of the survey system, type selection requirement and installed essentials etc.

本文详尽地介绍了雷达液位计的工作原理及特性，测量系统的组成，选型要求和安装要点等。

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