It is pointed out that the former “frequency changing method”has some problem such as high measuring current and large error etc. The “different frequency method”is developed. The measuring instrument of large scale grids resistance with different power frequency is also developed. It has the advantage of accurate, reliable and easy to use.
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The dissertation also presents the sensitivity of time domain method and frequency domain method to different kinds of error.
分析了时域法、频域法对不同类型误差的敏感程度。
Considering this, this paper presents a method by experiment which can measure performance curve of silicon steel sheet at different frequency as reference of designing variable frequency motor.
针对这种情况，本文提出一种实验的方法，测取不同频率下硅钢片的特性曲线，以供变频电机设计时参考。
Method: Sample solution were extracted by ultrasonic in different power and frequency and by reflux.
方法：用不同功率和频率的超声仪提取及加热回流提取样品液。
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