Calibrator Design, Based On A Microprocessor Controlled High-precision Charge

The theory and its designs of hardware and software of a charge calibrator which used in the calibration system of piezoelectricity sensor is being discussed mostly in this article. After that, according to the development order of the charge calibrator, we divide our work into the following parts:firstly, its theory discussing and demonstrating part, here we bring forward the overall design of the charge calibrator; secondly, we bring forward its actual hardware circuit and software design which we have done in the realization of the charge calibrator; at last, it's analysis of the error and experiment part,namely, we validate the design here.The basic fundamental of this charge calibrator is: it takes the 89C51 singlechip as core of control, and adopts the direct digital synthesis theory in the design. The realization of DDS is the key part of this designs, it is mostly embodied in the design of hardware circuit.Here, we used a large number of integrate circuit which embodied in the realization of frequency synthesize, wave generate, lowpass design and the control of frequency and amplitude of wave. In the last part, we analyse the error of this charge calibrator, in addition,we do many experiments to validate the function and performance of this charge calibrator,and come to a conclusion that the design of this charge calibrator is completely satisfied with the need of experiments.