开关电源输出纹波电流怎样测试

接纯电阻负载，用交流电压表（为了适应不同的仪表，最好串联上一个容量0.1微法的电容器）测量负载上的电压噪音。
也可以用电流互感器（就用中频磁芯自己绕，例如磁环，注意一次绕组就一圈，磁环要大，具体多大要看被测电流数值、磁芯性能、磁芯尺寸不能，饱和！）在实际负载上测量电压噪音。
电流互感器的输出绕组可能是十多圈到几十圈，用低电阻做负载，测量负载上的电压噪音。
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