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INA122U 输出异常

INA122U 单电源供电 电源电压12VDC Rg= 330ohm  Ref=0.05V  输入IN+和IN-短接 输出为 6.3V不变  不知是为什么?现在是冬天是否可能被静电击穿,换了3片都是一样的结果