21st century society is the Information Society. Information society is characterized by Information technology of the activities of human society and production activities. Modern information science includes three main things; collection - sensing technology; information transmission - communication technologies; signal processing - computer technology. Sensor is the source of modern information system ,and the material and technical basis of the survival and development in the information society also. If there are no advanced sensor technology, Communication technology and computer technology will be nothing. Therefore, the research and development of the sensor technology is inevitable demand for the Automation of the production process and the information age.
A.C unbalanced bridge is the basic measure circuit of the resistance , capacitance and inductance type transducer. User can have different bridge in use ,research found that exchange the location of the two output line of signal source and the two input line of the the balance indicator ,the result is obviously different.
In this essay, we analysis the sensitivity of the a.c unbalanced bridge based on the different bridge of the a.c unbalanced bridge, and based on the theoretical results, then we will give out the method of solving the problem.
