This article talks about the working principle of resistance strain gage direct current bridge measure circuit. It gives a description about how the variable gain amplifier AD8221 improves CMRR in strain measurement and the ESD protecting measure.

• 论述电阻应变片直流电桥测量电路的工作原理,介绍可变增益放大器AD8221在应变测量中的应用,并对其提高共模抑制比以及对ESD的防护措施进行阐述。