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TMS320F28377D: 频率响应分析仪SFRA在三相系统如何添加小信号?

Part Number: TMS320F28377D
Other Parts Discussed in Thread: SFRA

请问一下,如果在三相系统中想使用频率响应分析仪SFRA,应该怎么添加小信号呢?在其中一相添加就可以了吗?