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EVM430-FR6047: 激发频率默认增加6个不同频率的意义?

Part Number: EVM430-FR6047

配置USS软件的:number of pulses  2 ;

transducer:200kHz

测试实际激励为:2个200Khz方波加6个递增频率,分别为:300kHz、400kHz、500kHz、500kHz、500kHz、500kHz,这个是什么目的?意义是什么?