An RF power meter has one major drawback: it cannot measure frequency, so it may give an "approved" rating to a defective mobile telephone, as in the following two examples.

功率计的一个主要缺点是：不能测量频率，因此它会对一个有缺陷的手机给出“通过”，就像下面的两个例子。

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As an example, Finite element analysis and optimization design are made to a voltage transformer of rating primary voltage 35KV, rating secondary voltage 100V, rating frequency 50HZ.

并以额定一次电压35KV，额定二次电压100V，额定频率50HZ的电压互感器为例，进行了有限元分析计算和优化设计。

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The report also provides a five-star rating guide for 200 popular U. S. beaches, based on indicators of beach water quality, monitoring frequency and public notification of contamination.

根据海滩水质指标，监测频次和污染公告，报告也为美国200个受欢迎的海滩提供了五星级的评级。

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In marketing we measure television advertising by reach, frequency and gross rating points and if you extrapolate from that that the more feet you have on the street singing your praises and repeating those core messages at every turn you will be successful too.

FORBES: Sharpen Your Marketing By Measuring What Matters Most