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为什么ina118输出测试值为负数

Other Parts Discussed in Thread: INA118

把ina118作为一个电流检测芯片用,我的电路图的接法,把ref端接入换成了小电阻10Ohm,然后接地,输入并联在康铜丝两端,但是测试出来的输出值为负数,这是为什么呢?