keithley_2000

《Labview高级编程与虚拟仪器工程应用》第10章，关于液压系统测试的源码。包括： 1.“溢流阀动态”测试程序，其中小波变换使用了光盘中提供的VI,来自NI公司的高级信号处理工具包6.1版。“溢流阀动态.vi”是主程序。 2.“液压教学实验台”，“液压测试系统.vi”是主程序。 3.“机油泵”试验程序需要较多外部硬件支持。其中的dll用于国内某一特定品牌扭矩仪。“程序”文件夹的“main.vi”是主程序。 4.“转向泵”试验程序需要外部硬件支持。“程序”文件夹的“转向泵试验.vi”是主程序。(Labview high-level programming and virtual instrument engineering application)

锁相技术在测控、通信、数字信号处理等众多领域得到了广泛的应用。虚拟锁相环成为锁相环发展趋势之一，根据锁相环路的基本组成及原理，利用LabVIEW软件提供的强大的数值计算和信号分析等能力对锁相环进行设计。实验和仿真结果表明该软件锁相环具有较好的捕获和跟踪性能。利用软件实现的锁相环比硬件锁相环具有更好的灵活性和通用性，同时具有结构简单、参数设计灵活等优点。(Lock-in technique in many areas of monitoring and control, communications, digital signal processing, has been widely used. Became one of the virtual phase-locked loop phase-locked loop trends, according to the basic principles of composition and phase-locked loop, using LabVIEW software provides powerful numerical calculation and signal analysis capabilities such as phase-locked loop design. Experimental and simulation results show that the software PLL has a better acquisition and tracking performance. Use of software than hardware locked loop PLL has better flexibility and versatility, but also has a simple structure, flexible design parameters, etc..)

说明：  对excel文件进行读取，并用数组形式和图的形式进行显示。统计数据中的最大值，最小值，平均值，方差。采用中值滤波，滑动平均滤波等方法去除干扰。(The excel file is read and displayed in the form of array and graph. Maximum, Minimum, Average, Variance in Statistical Data. Median filter and sliding average filter are used to remove the interference.)

串口数据采集RS232串口是工业中比较常用，也最容易接触到的一种总线协议，台式机上一般都有二个，而现在很多下位机、仪器等很多都还是使用串口通信的。通过RS232串口可以方便的实现Labview与其他测试软件、控制软件的通信。(Serial port data acquisition RS232 serial port is a kind of bus protocol which is commonly used in industry, and it is also the most easy to contact. In general, there are two desktop computers, and many lower computer, instrument and so on are still used in serial communication. The communication between Labview and other test softwares and control software can be conveniently realized through RS232 serial port.)

说明：  神经网络在数据处理或模式识别中具有重要作用，这里采用LabVIEW实现了神经网络的功能，供工程师使用。(Neural networks play an important role in data processing or pattern recognition. LabVIEW is used here to implement the functions of neural networks for engineers to use.)

说明：  LabView信号处理算法，包括功率谱，幅值谱，小波分析等(LabVIEW signal processing algorithm)

说明：  实现串口 高速数据采集并通过波形显示。还有发送按键发送数据给下位机。(High speed data acquisition through serial port is realized and displayed by waveform.)

说明：  客户觉得TestStand界面复杂，希望一个简单的界面即可进行序列执行，采用LabVIEW调用TestStand引擎可实现快速设计，将TestStand拆解到LabVIEW。 然而，这样做需要设计大量回调函数，开发较费时间，项目对时间要求很严格，且投入不多，故希望有快速解决方案。 为此，设计时希望LabVIEW可以充当一个辅助软件，可配置和控制执行，进行简单数据交互，执行还是TestStand进行(The customer thinks that TestStand interface is complex, and hopes that a simple interface can be used for sequence execution. Using LabVIEW to call TestStand engine can realize rapid design and disassemble TestStand to LabVIEW. However, to do this, a large number of callback functions need to be designed, which takes a lot of time to develop. The project has strict time requirements and little investment, so we hope to have a fast solution. Therefore, it is hoped that LabVIEW can be used as an auxiliary software in the design, which can be configured and controlled for execution, simple data interaction, execution or TestStand)

用labview实现误差反传算法，使得初始曲线不断学习逼近给定曲线(The error backpropagation algorithm is implemented by LabVIEW, so that the initial curve is constantly learning to approximate a given curve.)

说明：  labview实现了多通道串口数据的TDMS保存(LabVIEW realizes TDMS saving of multi-channel serial port data)