Design And Application Of Oscilloscope Calibration Software

Digital storage oscilloscope is the key basic instrument in the field of electronic measurement.With the development of digital oscilloscope towards high performance,it is more and more important to ensure the measurement accuracy of digital oscilloscope.Therefore,digital oscilloscope must be calibrated regularly within its life cycle.The traditional calibration method of digital oscilloscope mainly relies on manual calibration personnel,which has low working efficiency,cumbersome operation process and low accuracy.Besides,the universality of the existing digital oscilloscope automatic calibration program is poor,so it needs to re-design the calibration procedure when facing different types of oscilloscopes.In this context,this topic is based on C# language and.NET framework,combined with virtual instrument technology,designed a set of universal calibration software for digital oscilloscope.By analyzing the calibration requirements of different models of oscilloscope,the automatic calibration of multiple calibration objects is completed on several types of digital oscilloscopes by separating the automatic calibration files from the automatic calibration software,and achieve the high calibration accuracy.The main research contents are as follows:(1)Overall software framework and general automatic calibration scheme design.According to the requirements of automatic calibration software used in different types of digital oscilloscopes,this paper determines the overall plan for separation of calibration files and calibration software through scheme comparison study,based on this,it designs the overall software framework and the overall flow of "Double cycle" structure,and analyses the general automatic calibration scheme in detail.Besides,according to the functional requirements of the software,this paper designs the instrument initialization module,calibration selection module and status display module which consist of the software UI interface.(2)Automatic calibration files design.Based on the syntax rules and structure of XML(Extensible Markup Language)and XML format files,combined with the business process of calibration,this part analyses the content composition and basic structure of the automatic calibration files,and designs the basic statement unit of the file.Based on this,it completes the design of zero and offset calibration files,gain calibration files and bias voltage calibration files by using the idea of parameterization;Finally,the function of reading and parsing the calibration file is realized by reflection principle.(3)Design of automatic calibration function.This part analyses the basic structure of the signal conditioning channel of the digital oscilloscope,and studies the calibration principle of zero and offset,gain and bias voltage,then on the basis of designing the content and structure of the calibration program,designs the error correction flow and function of the above key calibration objects.Through the research of the above contents,the universal automatic calibration software for multi-model digital oscilloscope is realized,which improves the calibration efficiency and accuracy.It is proved that the functions of the analysis software run normally,and the calibration results can meet the accuracy requirements.This paper uses automatic calibration files to extract the different parts of oscilloscopes of different models in the same calibration project,so as to improve the encapsulation,universality and expansibility of calibration software and calibration program.