摘要
本文提出扩大电阻应变仪量程的新方法——并联电阻法。利用n个校验电阻盒(应变仪附件)并联接在应变仪输入端上参与应变测量．即可扩大量程n倍。文中导出并联电咀法桥路基本公式和非线性误差公式，以修正测量结果，得到测点真实应变。本法有理论依据，简单可行，与目前常用的扩程方法相比，是一种有效的、简便的扩程方法，可供工程测试中应用。
This paper puts forward the Parallel Resistance Method: a new method of enlarging the range of resistance strain gauge. This makes use of n check resistance boxes (subassembly of strain gauge), which are parallel input end of strain gauge and enter into measure strain, then it can be obtained to en- large n times the range. This paper has led out foundamental and nonlined error formulae of electric bridge circuit of the Parallel Resistance Method, and the measuring results can be corrected in terms of these formulae, ther- efore, it can be obtained that the practial strain of measuring points. This Method is of theoretial basis and is easy, simple and effective compared with the existing method of enlarging the range. It can be provided for the appl- ication to engineering measurement.
