数字相位计的量程自动转换系统设计

为了保证数字相位计的使用安全和测量精确，本文设计了一种基于干簧继电器控制的新型量程自动转换系统．该系统的控制逻辑是通过计数器分别对电路中过量脉冲和欠量脉冲信号计数来实现的，每一次的计数会使不同的继电器导通，从而进入不同的量程通道，直到进入合适的通道才停止计数．该电路包括衰减器、幅值检测电路、脉冲发生电路、换程控制电路，整个电路系统测量精度高，稳定可靠，移植性强，具有非常重要的意义．

Design of the digital phase meter with auto range

In order to guarantee using the digital phase meter safety and measuring precision, this paper is designed a new type of auto range based on the relay control. The control logic of this system is controlled by the counter circuit, which is used to count the excessive pulse and owed pulse signal. Each time the counter will make the different relays work, thus the input signal will go into the different range channel. It will not count until the input signal goes into the right channel. This circuit including attenuator, amplitude detection circuit, pulse generator and the auto -range circuit, which make the measurement precise and the system stable. Therefore this design has a vital significance.