Data Acquisition HANS-PETTER HALVORSEN,
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1 Telemark University College Department of Electrical Engineering, Information Technology and Cybernetics Data Acquisition HANS-PETTER HALVORSEN, Faculty of Technology, Postboks 203, Kjølnes ring 56, N-3901 Porsgrunn, Norway. Tel: Fax:
2 Preface In this assignment you will learn basic Data Acquisition (DAQ) and how to use a DAQ unit in LabVIEW. We will use the USB-6008 DAQ device from National Instruments. For more information and additional resources: The purpose of data acquisition is to measure an electrical or physical phenomenon such as voltage, current, temperature, pressure, or sound. PC-based data acquisition uses a combination of hardware, software, and a computer to take measurements. The principle of Data Acquisition: USB-6008 DAQ device from National Instruments: ii
3 Table of Contents Preface...ii Table of Contents... iii 1 Introduction to Data Acquisition Tutorial Video Introduction to USB Videos Measurement and Automation Explorer DAQ Assistant DAQ Data Acquisition Logging Data to Files iii
4 1 Introduction to Data Acquisition In this task we will learn basic Data Acquisition in LabVIEW. We will use the USB-6008 DAQ device. 1.1 Tutorial Background information for this task is described in detailed in the Tutorial Data Acquisition in LabVIEW. The Tutorial consists of pdf documents, videos, example code, additional resources and links. The purpose of data acquisition is to measure an electrical or physical phenomenon such as voltage, current, temperature, pressure, or sound. PC-based data acquisition uses a combination of hardware, software, and a computer to take measurements. 1.2 Video It is recommended that you watch the Introduction to Data Acquisition video. The video is available from the webpage of this Lab Work. 4
5 2 Introduction to USB-6008 In this task you will use a USB-6008 DAQ device from National Instruments. For more information please read the NI USB-6008 DAQ Device Lab Equipment document. 2.1 Videos Recommended videos: Haugen. You should watch the video Analog voltage I/O with NI USB-6008 and LabVIEW by Finn The video is available from the webpage of this Lab Work. This video goes in detail on how you create an application in LabVIEW using the USB-6008 DAQ device. 5
6 3 Measurement and Automation Explorer Measurement & Automation Explorer (MAX) provides access to your National Instruments devices and systems. With MAX, you can: Configure your National Instruments hardware and software Create and edit channels, tasks, interfaces, scales, and virtual instruments Execute system diagnostics View devices and instruments connected to your system Update your National Instruments software Task 1: MAX Connect you USB-6008 Device and open the Measurement and Automation Explorer (MAX). See if you can find you DAQ device in MAX and make sure it works properly. Run a Self Test and open the Test Panels in order to test your device. Perform a so-called Loopback test. 6
7 7 Measurement and Automation Explorer Use a multi-meter to check if the voltage levels on the output and input channels are correct according to your settings. [End of Task]
8 4 DAQ Assistant Note! Read the USB-6008 DAQ device Lab Equipment document before you start! The document and additional information is available from: Connect your USB-6008 DAQ device to your computer and make sure it works. Use the Measurement and Automation Explorer (MAX) to configure and test your device. Use also a Volt meter to check that the voltage is correct. Measurement and Automation Explorer (MAX): The Data Acquisition palette in LabVIEW: 8
9 9 DAQ Assistant DAQ Assistant: The DAQ Assistant, included with NI-DAQmx, is a graphical, interactive guide for configuring, testing, and acquiring measurement data. With a single click, you can even generate code based on your configuration, making it easier and faster to develop complex operations. The NI-DAQmx Driver software is the layer of software for easily communicating with the hardware. It forms the middle layer between the application software and the hardware. Task 2: Analog Output Create a program in LabVIEW that write analog values from the USB-6008 DAQ device. Use the DAQ Assistant. The program should include a While loop that continuously write values from the USB-6008 DAQ device. Example: The DAQ Assistance should look something like this:
10 10 DAQ Assistant [End of Task] Task 3: Analog Input Create a program in LabVIEW that read analog values from the USB-6008 DAQ device. Use the DAQ Assistant. The program should include a While loop that continuously reads values from the USB-6008 DAQ device. Example:
11 11 DAQ Assistant The DAQ Assistance should look something like this: [End of Task] Task 4: Analog In/Out Create a new program where you connect the Analog Input and Analog Output programs together in one program. Specifications for the application:
12 12 DAQ Assistant Put the Analog Input and Analog Output code into different SubVIs. Do some calculations on the input signal and send the calculated result to the analog output. Put the calculation code into a SubVI. Plot the different values on the screen. Use the Project Explorer in LabVIEW for your application. Create an Executable File (.exe) of your Application. In order to use the Project Explorer, you will have to create an Empty Project : Below we see an example of the Project Explorer: Below we see how we can use the Project Explorer to create an.exe (executable) file:
13 13 DAQ Assistant [End of Task]
14 5 DAQ 5.1 Data Acquisition In this task we will connect our DAQ device to a real process. Below we see the Lab Equipment available for this assignment: Level Tank Air Heater Documents of how to use the Level Tank/Air Heater and the USB-6008 DAQ device is available from Level Tank: Air Heater: USB-6008: Task 5: Test DAQ Device on a Real Process Select one of the processes above and connect you DAQ device to the system. Log data (Temperature for the Air Heater system or Level for the Water Tank) for different input signals (u). Show the results in a Chart. You may want to use the Waveform Chart located in the Graph palette: 14
15 15 DAQ Try to act like a controller: Let s say you want the output Temperature to be 35 degrees (setpoint) and then try to manually adjust the control signal (u) so the Temperature stays on the setpoint. Make sure to scale the output signal from the system (Voltage signal) to Temperature (Air Heater) or Level (Water Tank). Scaling: Air Heater output: 1-5V o C. Water Tank output: 0-5V 0-20cm. The following linear relationship applies:
16 16 DAQ You have to find a (slope) and b (intercept). The following formulas may be used: This gives: where [End of Task] 5.2 Logging Data to Files Here we will use files to store data from a process. Task 6: Write to Measurement File
17 17 DAQ Here you will create a program that save the process data to a text file for later use. We can either get data from a real process or just using data from a simulator. We can e.g., use the example General PID Simulator.vi as a base for your application. Use the NI Example Finder (Help Find Examples ) in order to find the VI in LabVIEW. (Use you modified version created in a previous Lab Work) You should log the control signal and the measurement value in the file. The time will be automatically logged. You can use the Write to Measurement File function on the File I/O palette in LabVIEW for writing data to text files (use the LVM data file format, not the TDMS file format which give binary files).
18 18 DAQ Recommended settings for the Write To Measurement File : Open the Measurement File in Notepad. It should look something like this (3 columns): Time Control Signal Process Value
19 19 DAQ You should open the logged data in Excel and plot the data in Excel. Example of LabVIEW Program that log data to a Measurement File: Block Diagram:
20 20 DAQ [End of Task] Task 7: Read from Measurement File Create another program that open the measurement file and shows the data in an array and a Graph. Use the Read From Measurement File in LabVIEW. Recommended settings for the Read From Measurement File : Example of LabVIEW program:
21 21 DAQ You should also open the file in Excel and plot the data in Excel. [End of Task]
22 Telemark University College Faculty of Technology Kjølnes Ring 56 N-3914 Porsgrunn, Norway Hans-Petter Halvorsen, M.Sc. Telemark University College Department of Electrical Engineering, Information Technology and Cybernetics Phone: Blog: Room: B-237a
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