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测音频功率

有哪个大神知道该怎么测D类功放的输出功率?

用万用表可以吗?测直流电压还是交流电压?

                                串联测电流吗?测直流电流还是交流电流?

用示波器并联测试电压可以吗?取示波器的哪个值?

诚信谢谢回答我问题的大神。