Frequency Measurement Technology Based On High-precision Quartz Crystal Calorimeter

Based on the theory of frequency testing , a system of the quartz calorimeter and the high accuracy frequency testing method are described . The experiments and results study are also included.On the first, the quartz calorimeter is presented, especially about the operating principle, the structure of the system and the working routine .Secondly, the high accuracy frequency testing method is analysed in detail , including the basic ways of the frequency testing and the using of the quartz crystal . The technology of the frequency testing in multicycle synchronous mode and the measuring errors are studied in a deep-going way.Then , the module structure of the frequency testing system are described mainly about the designing thinking and the concrete implement. The interface on the back end computer and its incidental functions are presented .At last , the experiments are described , including testing the frequency , standardizing the calorific capacity of the instrument and the determination of calorific value of coal . The results of the experiments are analysed .