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运放两输入端相差0.5V后恢复问题

公司的一个电路,因为某些原因,在故障时正向放大器的同相端短电压比反相端会搞出0.5V左右(一个是0.1V,一个是0.6V,正负8V供电),输出已经达到最高了,无法调节了,在恢复正常时,其一开始的测量电压会稍微大一些(大出全量程千分之几),之后会慢慢恢复正常(需要一分钟左右),请问是否是运放的问题?(之前有怀疑过是电容的问题,但是通过测试已经排除掉了)