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INA199: 失调电压过大的问题

user4337003
Intellectual 290 points
Part Number: INA199


用INA199A1做上端电流检测，片子焊接到空板上，REF接地，只供.电测试，输出端对地居然有160-500mV的电压，检查供电和PCB板没有问题。我是不是买到假货了.......