On the basis of time interval calculate formula which has been deduced, this paper offers the recommended length of digital signal orbital circuit in the condition of the minimal of the time interval.
The theoretical analysis for the proposed circuit is presented and necessary conditions are derived to realize the minimal errors.
对所提出的电路进行了理论分析，导出了将误差降至最小的必要条件。
3
A fault concentrated alarm system was developed with 80c196kc as its core. The system is composed of signal detection circuit, single chip minimal system and fault alarm circuit.