自动门
自动门:表征交流电量大小的参数
发布时间:2015/6/5
自动门讯:
表征交流电量大小的参数
对于交流电量的测量,一般都是将交流换成直流以后再进行测量。
交一直流的变换,通常由检波电路完成。常用的检波电路有三类:一类是响应于输入交流电的平均值的平均值检波;一类是响应于峰值检波;一类是响应于有效值的有效值检波。显然,由这些检波电路构成的交流电表,也将相应地具有平均值、峰值和有效值响应等特性。
虽然交流电量的大小可以用平均值、峰值、有效值或辅以波形因数、波峰因数等多种方式来表征,但除了特别注明外,几乎所有的交流电压(流)表都用有效值来定度。
乍看起来,按有效值定度会给平均值或峰值响应的电压表带来麻烦。其实不然,因为多数测量对象是正弦波,而正弦波的平均值、峰值和有效值之间有着固定的比例关系。按有效值定度,只不过是反这种固定的比例常数蕴含在刻度的位置上而已。
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