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反射式心率测试问题

Other Parts Discussed in Thread: AFE4400

用AFE4400芯片,用反射式的方式,现能测出手指的波形,但测不出手腕处的波形。以下图片为红外接收管的参数及手指端所测的波形,请问这个红外接收管能不能用来在手腕上测心率?