45UV5-1000
45UV5-1000
45UV5-1000
1、通常我们说的变频器输出380V、50Hz，是指其基波（正弦波）为380V、50Hz。变频器实际输出波形为PWM波，除了基波外，还包含载波信号。载波信号频率要比基波高得多，且是方波信号，包含大量的高次谐波。
2、普通万用表一般只能测量45~66Hz或45~440Hz的交流正弦波。部分真有效值万用表的测量频率范围要宽得多，许多人认为可以用于变频测量、测试。其实不然，因为这种表测量结果把基波和载波都包含进去了。比如上述变频器，380V输出时，测量结果一般在400V以上。
3、用于变频测试的仪表应具备在各种PWM波形中分解出其基波的能力，严格测量需采用数字信号处理的方式，也就是高速采样得到样本序列，再对样本序列进行离散傅里叶变换，得到基波有幅值、相位及各次谐波的幅值和相位。
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