文章介绍了使用电子线路实现测角系统调零的原理,框图以及使用中的注意事项。它的原理是基于变化着的轴角量是一种有模变量;当需要改变它的计量起始零点时,只须给已经测量出的变量减去某一固定的量。使用电子线路法取代机械调零法,给经纬仪整机的机械设计、安装、调试以及现场使用都带来极大的方便。这种方案已经应用到正在研制的一种小型高速经纬仪上。 The paper introduces the principle, block diagram and precautions in using the electronic circuit to realize the zero angle measurement system. Its principle is based on a change in the shaft angle is a kind of modulo variable; when it is necessary to change its measurement start zero, only to the measured variable minus a fixed amount. The use of electronic circuit method instead of mechanical zero adjustment, theodolite machine mechanical design, installation, commissioning and on-site use have brought great convenience. This solution has been applied to a small high-speed theodolite being developed.