交流电桥示零器电路的改进

The Improvement on the Circuit of a Zero Indicator in an AC Bridge

根据一般交流电桥测量电容的原理,提出了一般交流电桥在选用交流电源和交流示零器时,不能同时选用不平衡式仪器的问题。改进了一般交流电桥示零器电路,并用实验验证。示零器电路改进后的交流电桥,增大了示零器电路的内阻,提高了交流电桥的灵敏度,对任何形式的电容电桥、电感电桥都适用。

Based on the general measuring theory of electric capacity in an AC bridge, the author puts forth a question that unbalanced instrument can′t be adopted simultaneously for an alternating current and an AC zero indicator in an AC bridge. The author also improves the circuit of a zero indicator in an AC bridge and tests it with an experiment. The increased internal resistance within an improved zero indicator helps increase the sensitivity of the AC bridge and thus can be available for any type of capacity bridge and induction bridge.