本文描述一种新型的用于反应堆启动过程中的功率和周期测量及周期和小功率保护装置。它以 BF_3正比计数管和裂变电离室为探测器,测量从源区到满功率的十二个数量级的中子通量,它给出对数和线性数字功率及模拟周期与数字周期指示,并能自动打印所测得的数据。实现了探测器的自动切换和电源电压的连续监测。由于它具有量程宽、功能多、自动化程度高等特点,它可以作为一种较理想的安全监测装置接入反应堆保护系统。 This article describes a new type of power and period measurement and periodic and low power protection devices for reactor startup. With BF_3 proportional counters and fission ionization chambers as detectors, it measures twelve orders of magnitude neutron flux from the source region to full power, which gives logarithmic and linear digital power and analog cycle and digital cycle indications and Can automatically print the measured data. Realize the automatic switching of the detector and continuous monitoring of the power supply voltage. Due to its wide range, versatile functions and high degree of automation, it can be used as an ideal safety monitoring device to access the reactor protection system.