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ADS1298开发板上面的交流耦合那里为什么被直接短路掉了

 如题,JP14为什么直接被短路掉了?耦合电容也NI了, 采集的心电信号不可以通过交流耦合的方式连接到芯片吗?如果可以的话C87和R41  R42的参数是多少?