Multi-function High-precision Time Calibrator And Design

At present, the domestic various Electricity company to the multi-tariff electrical energy table, the multi-purpose electrical energy table's time measurement's verification way and the method is various, useful frequency measurement frequency output, useful stopwatch compared to, useful broadcasting station to, uses the measurement appliance's rank, the measuring accuracy are unable to limit. The home to the multi-tariff electrical energy table, the multi-purpose electrical energy table's time measurement verification is being at the start stage. the multi-purpose electrical energy table time check meter is the examination time sharing measurement (multi-tariffs) the electrical energy table designs the development the instrument. It on-line may examine the multi-purpose electrical energy tables with the electrical energy table system when the daily reckoning error, meanwhile has the GPS automatic timing, the phase determination, the frequency measurement and the variable voltage output function. the this time check meter is the standard signal which produces using the high accuracy GPS time service module tames the local pressure to control the constant temperature crystal oscillator, guaranteed that provides for the complex programmable component (CPLD)EPM1270 high accuracy, the high stability clock signal. In order to guarantee that the measuring accuracy achieves 1ppb, uses and so on precision measures eliminate±1 the measuring error in the survey method, the use time-gap survey enhancement measuring accuracy. Simultaneously to enhance display monitor's clarity and brightness preference with the fluorescence lattice display monitor may carry on the chart article demonstration. It is that selects the monolithic integrated circuit to realize as system's master control chip with the outside good connection. the high accuracy's time measurement module first tests through the VHDL language programming after the Quartus II 7.1 softwares the simulation succeeds downloads to the CPLD chip, and carries on the coordinate debugging with the system board, achieves anticipated project objective.