The Design of the Module Exchange Measuring Head Based on 112-System

This paper puts forward a type of device which can automatically measure the operation status of the module exchange in 112-system according to the measuring problems in the terminations of both the small-capacitance telephones and the burglar alarms. In this device, the measuring method of three-terminal phase is adopted, which can effectively measure the electric resistance and capacitance between the different layers of the lines. Therefore, it can complete the measurement of the subscriber lines. In addition, it is able to measure different types of switches and a variety of lines, and especially adds the measurements on the noise and the degree of balance. After its system goes through rigorous tests, the errors are measured to fulfill users’ demands, and thereby the purposes of saving manpower and improving the efficiency of measurement and feedback can be achieved.