PC-DAQ Lab - Department of Physics
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1. environment When running with Visual C the default mode is DEBUG so sometimes you will find the executable programs in the Debug directory How to create a DAQPad program setup a new project in C from a NI example following instructions from www ni com document How to Compile and Run NI DAQ Examples with Microsoft Visual C located on desktop of MPL3 computer Open MS Visual C Then 1 Start by opening a new project by going to File New 2 The Projects tab should come up by default You will be asked for the name and type of project Select the Win32 Console Application as the type and give your project a name 3 Select Empty Project in the next step Once you have a new project it will show your folder menu on the left and the file screen on the right When you double click on any file you have in your project it will be displayed on the right side To make navigation easier change from Class View to File View 4 To integrate the source code for most of the data acquisition application examples you just need to add two libraries and header files into your project Go to the Project Add to Project File menu 5 Select the NI DAQ LIB directory and add the nidaq32 lib file and the nidex32 lib file You should also insert the nidaqex h and nidaq h file from the NI DAQ Include folder 6 Go to Tools Options and select the Directories tab 7 Set the option to be Include Files Mak2. Experiments in Modern Physics Introductory Lab PC DAQ Rex Tayloe Department of Physics Indiana University 1 1 03 Last Revised 9 4 03 Goal Become familiar with operating and writing code to address the National Instruments DAQPad 6020E multifunction I O device Introduction In this lab you will get acquainted with the National Instruments 1 DAQPad 6020E multifunction I O device the DAQPad 2 After this introduction you will then be able to use this device to acquire data for other experiments You will also be introduced to the Microsoft Visual C programming environment that is needed to program and readout the device You will do these tasks 1 Startup the DAQPad and test it with the provided test software 2 Create and run a program with Visual C starting with an example provided 3 Run an existing program to acquire data and then analyze this data to characterize a battery 4 Write your own program to investigate a feature of the DAQPad Equipment Computer with NI DAQ software MPL3 DAQPad 6020E voltmeter old battery variable resistance misc cables DAQPad manuals Paper and or on the computer Preparation Read the Section in Ref 3 about ADCs Read the introductory part of the the DAQPad manual 2 available as hardcopy near the computer on the computer as a pdf file or at the National Instruments www site Create a voltage source by putting a sufficiently large resis
3. e sure that you point to the same directory in NI DAQ INCLUDE This may be set already for you 8 From the same tab set the option to be Libraries and set a path for NI DAQ LIB This may be set already for you 9 Now add to your project the source code and header if needed that you want to use To do this copy an example from the NI DAQ examples directory C Program Files National Instruments NI DAQ Examples VisualC Ai into the project directory rename if you wish Add this C file to the project by the Project Add to Project File steps as above 10 To build Change to File View left click on the C program you just added Build Build lt progname gt exe to compile and link then Build Execute lt progname gt exe to run This can also be run from outside the C environment double click on the exe file
4. ges It is useful to look at an older battery that discharges faster Plot and analyze this data to characterize the voltage source the battery Use the ideal source internal resistance model to characterize the battery How does the internal resistance change with time How does the power through the external resistance change with time What is the total energy delivered How long with the battery last Task 4 Create your own program to investigate a feature of the DAQPad Starting with the C project that you set up in Task 2 edit the program and investigate another feature of the DAQPad References 1 http www ni com 2 DAQPad 6020E User Manual National Instruments Sept 1998 3 W R Leo Techniques for Nuclear and Particle Physics Experiments Springer 1987 Appendix Miscellaneous Notes The DAQ area on the MPL3 computer is C MPLDAQ In the following the NI DAQ directories are at and under C Program Files National Instruments NI DAQ There is a shortcut under the MPLDAQ directory as well General programming help is in pdf file NI DAQ for PC Version 6 9 1 User Manual under Programs gt gt National Instruments gt gt NI DAQ gt gt Documents The DAQ function reference help is under Programs gt gt National Instruments gt gt NI DAQ gt gt NI DAQ Help Be careful not to change any of the original files in the NI DAQ directories Always make copies Understand how this works with the Visual C
5. tance across the battery You will use this to exercise the DAQPad Task 1 Startup and test the DAQPad Start and or login to the MPL3 computer Make sure the DAQPad power switch is off plug in the power supply and USB cable Turn on the DAQPad You should hear MPL3 acknowledge the connection Double click on the Measurement amp Automation desktop icon or find from program menu Find the DAQPad under devices and interfaces and run the test panel Plug ina voltage source to an input channel and read it Hook a voltmeter up to an output channel and verify operation Read the DAQPad manual to understand the analog input and output channels and the various modes of operation differential single ended Task 2 Create and run the AlonePoint program with Visual C Following the instructions in the Appendix setup a new project under the C MPLDAQ area using MS Visual C Copy the AlonePoint C code from the NI DAQ area Run it with your voltage source input to verify that it is reading correctly Change the code to read a different channel with a different gain etc Task 3 Run the DaqToDisk program to collect data and characterize a battery In MPLDAQ there is a project called daqtodisk Compile link and run this program Note that as currently written you have to edit the C code to change the channel gain sample rate etc Hook up your voltage source and record the voltage as the battery dischar
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