Performance Optimization Of Digital Refrigerating Multimeter And Development Of Its Mobile Terminal Measurement And Control Software

Now air conditioning and refrigeration system has been widely popularized and applied.The ensuing maintenance and overhaul work has also become indispensable.In the past,to maintain the air conditioning and refrigeration systems,technicians need to carry a number of measuring instruments,and measure temperature,pressure and other parameters.In order to get the parameters of supercooling and superheating,you need to check the refrigerant thermodynamic properties of the table and calculate.The above maintenance process makes the air conditioning and refrigeration system maintenance and performance testing time-consuming,high cost.Digital refrigeration multimeters can measure temperature,pressure,degree of vacuum,degree of supercooling,and superheat for dozens of refrigerants,improving the measurement efficiency and reducing the maintenance cost of the system.With the help of smart phone’s outstanding computing power and graphics rendering capabilities,the mobile terminal control software has made up for the shortcomings of the instrument in data processing,storage,and graphics,and realized the preservation and statistics of instrument measurement parameters,as well as the drawing of pressure enthalpy graphs and curves.Describe the measurement principle of digital refrigeration multimeter,in-depth analysis of the application requirements of the instrument,especially the reliability requirements,the performance of the instrument is optimized,involving the mechanical structure of the instrument,signal measurement circuit,embedded software and electromagnetic compatibility,etc.By analyzing the causes of temperature measurement error,the temperature sensor selection,temperature measurement circuit,and temperature acquisition procedures are optimized and improved to improve the accuracy and range of temperature measurement.By analyzing the sources of electrostatic interference of the instrument,the mechanical structure of the instrument is improved,which strengthens the antistatic interference ability of the instrument.By adopting the common measures of surge protection,the power interface of the meter has been improved to improve the anti-surging performance of the instrument.Through the analysis of the demand and feasibility of the instrument mobile measurement and control software(the following is referred to as measurement and control software),the UML model is established to clearly define the structure,framework and function of the measurement and control software.The design of instrument circuit is optimized,the communication between the instrument and the measurement and control software is realized by embedding the serial Wi Fi module.Using this module,measurement and control software receive measurement data and sent control commands.Through the communication between components and inter-thread communication,measurement and control software present the measurement data and measurement data charts,the measurement data were collected and saved at the same time.On the basis of the obtained measurement data,the enthalpy diagram of the refrigeration system is drawn by using the thermodynamic properties of the working fluid and the Martin-Hou equation.In terms of software interface design and charting,it describes how to customize and optimize charts and controls on the mobile terminal.Finally,the function test of control software is tested to ensure that the measurement and control software achieve its expected function and performance.