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INA138 输出问题

Other Parts Discussed in Thread: INA212

PACK+接到12V。负载用50欧姆水泥电阻。 测得R48两端电压0.9mV。放大倍数为100K/5K=20

用万用表测mV档R470两端电压,读数一直不稳定。从30mV持续增涨到200mV。

请问:

1、Vsense 为0.1mV,该期间能不能准确输出?

2、我们需要精确测试峰值40A电流,待机50mA,有没有推荐方案。