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ADS1274测电阻

Other Parts Discussed in Thread: THS4521, ADS1274

用的就是官方推荐的电路图,THS4521与ADS1274连接,用电阻分压法测电阻,电路图如图1,当把1跟2连接后“V测” 电压会变低,这该怎么办呢,是不是电阻R1的原因呢,求大神给个解决方法。。。。。怎样才能使测量阻值准确呢。。。。