LabVIEW Getting Started with LabVIEW Manual

LabVIEW Getting Started with LabVIEW Manual
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LabVIEW Getting Started with LabVIEW Manual

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    LabVIEWTMGetting Started with LabVIEWGetting Started with LabVIEWJune 2013373427J-01

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    SupportWorldwide Technical Support and Product Informationni.comWorldwide OfficesVisit ni.com/niglobal to access the branch office Web sites, which provide up-to-date contact information, support phone numbers, email addresses, and current events.National Instruments Corporate Headquarters11500 N...

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    Important InformationWarrantyThe media on which you receive National Instruments software are warranted not to fail to execute programming instructions, due to defects in materials and workmanship, for a period of 90 days from date of shipment, as evidenced by receipts or other documentation. Nat...

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    Other product and company names mentioned herein are trademarks or trade names of their respective companies.Members of the National Instruments Alliance Partner Program are business entities independent from National Instruments and have no agency, partnership, or joint-venture relationship with...

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    © National Instruments|vContents 8,About This Manual 8,Related Documentati 8,on 8,.................................................................................................... 8,ix 9,Chapter 1 9,Getting Started with 9,LabVIEW Virtual Instruments 9,Building a Virtual 9, Instrument. 9,.....

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    Contentsvi|ni.com 39,Summary 39,........................................................................................................................... 39,2-11 39,Using the LabVIEW 39, Help Resources 39,....................................................................... 39,2-11 40,Cust...

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    1,Getting Started with 1,LabVIEW© National Instruments|vii 63,Communicating with an Instrument: 63,Using Instrument Drivers and 63,the Instrument 63,I/O Assistant 63,.................................................................................................................. 63,4-6 6...

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    © National Instruments|ixAbout This ManualUse this manual as a tutorial to familiarize yourself with the LabVIEW graphical programming environment and the basic LabVIEW features you use to build data acquisition and instrument control applications.This manual contains exercises that you can use ...

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    © National Instruments|1-11Getting Started with LabVIEW Virtual InstrumentsLabVIEW programs are called virtual instruments, or VIs, because their appearance and operation imitate physical instruments, such as oscilloscopes and multimeters. LabVIEW contains a comprehensive set of tools for acquir...

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    1-2|ni.comChapter 1Getting Started with LabVIEW Virtual InstrumentsLaunching LabVIEWThe Getting Started window appears when you launch LabVIEW. Use this window to create new projects and open existing files. You also can access resources to expand the capability of LabVIEW and information to help...

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    © National Instruments|1-3 1,Getting Started with 1,LabVIEWFigure 1-2. New Dialog Box4.Click the OK button to create a VI from the template. You also can double-click the name of the template VI in the Create New list to create a VI from a template.LabVIEW displays two windows: the front panel...

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    1-4|ni.comChapter 1Getting Started with LabVIEW Virtual Instruments6.Select Window»Show Block Diagram and examine the block diagram of the VI.The block diagram appears with a white background and includes VIs and structures that control the front panel objects. The title bar of the block diagram...

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    © National Instruments|1-5 1,Getting Started with 1,LabVIEW2.If you are a new LabVIEW user, the Controls palette opens with the Modern palette, shown 13,in the following figure, visible by default. If you do not see the Modern palette, click Modern on the Controls palette to display the Modern...

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    1-6|ni.comChapter 1Getting Started with LabVIEW Virtual InstrumentsChanging a Signal TypeThe block diagram has a blue icon labeled Simulate Signal. This icon represents the Simulate Signal Express VI. An Express VI is a component of the block diagram that you can configure to perform common measu...

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    © National Instruments|1-7 1,Getting Started with 1,LabVIEWFigure 1-4. Configure Simulate Signal Dialog Box4.Click the OK button to save the current configuration and close the Configure Simulate Signal dialog box.5.Move the cursor over the down arrows at the bottom of the Simulate Signal Expr...

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    1-8|ni.comChapter 1Getting Started with LabVIEW Virtual InstrumentsWiring Objects on the Block DiagramTo use the knob to change the amplitude of the signal, you must connect two objects on the block diagram.Complete the following steps to wire the knob to the Amplitude input of the Simulate Signa...

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    © National Instruments|1-9 1,Getting Started with 1,LabVIEW5.When the Wiring tool appears, click the arrow on the Knob terminal and then click the arrow on the Amplitude input of the Simulate Signal Express VI, shown below, to wire the two objects together. A wire appears and connects the two o...

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    1-10|ni.comChapter 1Getting Started with LabVIEW Virtual InstrumentsModifying a SignalComplete the following steps to scale the signal by 10 and display the results in the front panel graph.1.In the block diagram, use the Positioning tool to click the wire that connects the Simulate Signal Expres...

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    © National Instruments|1-11 1,Getting Started with 1,LabVIEWFigure 1-5. Functions Palette4.On the Arithmetic & Comparison palette, select the Formula Express VI, shown below, and place it on the block diagram between the Simulate Signal Express VI and the Waveform Graph terminal. You can m...

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    1-12|ni.comChapter 1Getting Started with LabVIEW Virtual InstrumentsNoteIf you place an object too close to another object on the block diagram, automatic wiring might wire the two objects together. Delete the wires if the automatic wiring is wrong. To configure automatic wiring, select Tools»Op...

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    © National Instruments|1-13 1,Getting Started with 1,LabVIEWFigure 1-6. Configure Formula Dialog BoxNoteIf you enter an invalid formula in the Formula text box, the Errors LED in the upper right corner turns from green to gray and displays the text Invalid Formula. 10. Click the OK button to s...

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    1-14|ni.comChapter 1Getting Started with LabVIEW Virtual Instruments13. Use the Wiring tool to wire the Result output of the Formula Express VI to the Waveform Graph terminal. Examine the wires connecting the Express VIs and terminals. The arrows on the Express VIs and terminals indicate the dire...

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    © National Instruments|1-15 1,Getting Started with 1,LabVIEWThe block diagram should appear similar to the following figure.Figure 1-8. Block Diagram Showing the Merge Signals Function 3.Press the <Ctrl-S> keys or select File»Save to save the VI.4.Return to the front panel, run the VI, ...

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    1-16|ni.comChapter 1Getting Started with LabVIEW Virtual InstrumentsThe Knob Properties dialog box should appear similar to the following figure.Figure 1-9. Knob Properties Dialog Box3.Click the Scale tab. In the Scale Style section, place a checkmark in the Show color ramp checkbox. The knob in...

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    © National Instruments|1-17 1,Getting Started with 1,LabVIEWCustomizing a Waveform GraphThe waveform graph indicator displays the two signals. To indicate which plot is the scaled signal and which is the simulated signal, you can customize the plots.Complete the following steps to customize the...

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    1-18|ni.comChapter 1Getting Started with LabVIEW Virtual Instruments9.Reopen the Graph Properties dialog box and experiment with other properties of the graph. For example, on the Scales page, try disabling automatic scaling and changing the minimum and maximum value of the y-axis.10. Click the C...

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    © National Instruments|1-19 1,Getting Started with 1,LabVIEWexternal resources might leave the resources in an unknown state. Design the VIs you create with a stop button to avoid this problem. A stop button stops a VI after the VI completes its current iteration.Express VIsUse Express VIs loca...

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    1-20|ni.comChapter 1Getting Started with LabVIEW Virtual InstrumentsShortcutsThis chapter introduced the following keyboard shortcuts.NoteThe <Ctrl> key in shortcuts corresponds to the (Mac OS X) <Command> key or (Linux) <Alt> key.ShortcutFunction<Ctrl-R>Runs a VI.<Ctrl...

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    © National Instruments|2-12Customizing a VIYou can choose one of many LabVIEW template VIs to use as a starting point when building VIs. However, sometimes you need to build a VI for which a template is not available. This chapter teaches you how to build and customize a VI without using a templ...

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    2-2|ni.comChapter 2Customizing a VIComplete the following steps to open a blank VI. 1.In the Getting Started window, click the Create Project button to display the Create Project dialog box. The Create Project dialog box provides common starting points for LabVIEW projects.2.Select Blank VI from ...

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    © National Instruments|2-3 1,Getting Started with 1,LabVIEW3.Use the information that appears in the Context Help window to find the Express VI that can simulate a sine wave signal. Keep the Context Help window open. The context help provides useful information as you complete the rest of this ...

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    2-4|ni.comChapter 2Customizing a VI5.Press the <Ctrl-Space> keys to open the Quick Drop dialog box. (Mac OS X) Press the <Command-Shift-Space> keys.When you know which item you want to add to the block diagram or front panel, you can use the Quick Drop dialog box to quickly find the i...

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    © National Instruments|2-5 1,Getting Started with 1,LabVIEW3.Right-click the Enable input and select Create»Control from the shortcut menu to create a switch. A Boolean control, shown below, appears on the block diagram. Control terminals have a thicker border than indicator terminals. Also, a...

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    2-6|ni.comChapter 2Customizing a VIConfiguring a VI to Run Continuously until the User Stops ItIn the current state, the VI runs once, generates one signal, and then stops running. To run the VI until a condition occurs, you can use a While Loop.Complete the following steps to add a While Loop to...

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    © National Instruments|2-7 1,Getting Started with 1,LabVIEW7.Release the mouse to place the While Loop around the Express VIs and wires. The While Loop, shown below, appears with a STOP button wired to the conditional terminal. This While Loop is configured to stop when the user clicks the STOP...

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    2-8|ni.comChapter 2Customizing a VI6.In the errors and warnings list, double-click the Wire: has loose ends error to highlight the broken wire. 7.Press the <Ctrl-B> keys to delete the broken wire.Pressing the <Ctrl-B> keys deletes all broken wires on the block diagram. You can press t...

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    © National Instruments|2-9 1,Getting Started with 1,LabVIEWUsing a Table to Display DataComplete the following steps to display a collection of mean values in a front panel table.1.Display the front panel. 2.On the Controls palette search for the Express Table indicator and add it to the right ...

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    2-10|ni.comChapter 2Customizing a VI8.Display the front panel and arrange the controls and indicators as shown in 29,Figure 2-1.9.Run the VI.10. Click the Enable switch. If the Enable switch is on, the table displays the mean values of every 25 samples of the sine wave. If the Enable switch is o...

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    © National Instruments|2-11 1,Getting Started with 1,LabVIEW5.After you read the description of the Express VI, click the Open example button in the Example section near the bottom of the topic to open an example that uses the Amplitude and Level Measurements Express VI.6.Run the VI and move th...

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    2-12|ni.comChapter 2Customizing a VI•The LabVIEW Help contains detailed information about LabVIEW objects. To access the LabVIEW Help topic for an object, move the cursor over the object and click the Detailed help link in the Context Help window. You also can right-click an object on the block...

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    © National Instruments|2-13 1,Getting Started with 1,LabVIEWErrors and Broken WiresThe Run button appears broken when the VI you are creating or editing contains errors. If the Run button is still broken when you finish wiring the block diagram, the VI is broken and cannot run.Click the broken ...

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    2-14|ni.comChapter 2Customizing a VIShortcutsThis chapter introduced the following keyboard shortcuts.NoteThe <Ctrl> key in these shortcuts corresponds to the (Mac OS X) <Command> key or (Linux) <Alt> key.ShortcutFunction<Ctrl-N>Opens a new, blank VI.<Ctrl-H>Shows or...

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    © National Instruments|3-13Analyzing and Saving a SignalLabVIEW includes a set of Express VIs that help you analyze signals. This chapter teaches you how to use LabVIEW to perform a basic analysis of a signal and how to save the analyzed data to a file.NoteThe exercises in this chapter use Expre...

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    3-2|ni.comChapter 3Analyzing and Saving a SignalModifying a VI Created from a TemplateComplete the following steps to create a VI that generates, analyzes, and displays a signal.1.Select File»New to display the New dialog box.2.From the Create New list, select VI»From Template»Tutorial (Gettin...

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    © National Instruments|3-3 1,Getting Started with 1,LabVIEW12. Run the VI. The signal appears in the graph.13. Click the STOP button to stop the VI.Adding a SignalThe Simulate Signal Express VI simulates a sine wave by default. You can customize the simulated signal by changing the options in t...

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    3-4|ni.comChapter 3Analyzing and Saving a SignalFigure 3-2. Configure Simulate Signal Dialog Box14. Click the OK button to save the current configuration and close the Configure Simulate Signal dialog box.Adding Two SignalsTo add two signals together to create one signal, you can use the Formula...

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    © National Instruments|3-5 1,Getting Started with 1,LabVIEWNoteLabVIEW displays a folder glyph to the left of subpalettes in the search results and displays a light blue glyph to the left of Express VIs in the search results.3.In the Label column, change the label for X1 to Sine and the label f...

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    3-6|ni.comChapter 3Analyzing and Saving a Signal3.Search for the Filter Express VI, shown below, and add it to the block diagram between the Simulate Signal2 Express VI and the Amplitude and Level Measurements Express VI. The Configure Filter dialog box appears.4.In the Filter Specifications sect...

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    © National Instruments|3-7 1,Getting Started with 1,LabVIEWModifying the Appearance of GraphsYou can use the Display Format page of the Graph Properties dialog box to specify how the scales of the x-axis and y-axis appear on the graph.Complete the following steps to change the format of the x-a...

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    3-8|ni.comChapter 3Analyzing and Saving a Signal4.Click the OK button to save the current configuration and close the Configure Amplitude and Level Measurements dialog box. The RMS output of the Amplitude and Level Measurements Express VI changes to reflect the new Peak to Peak output, shown belo...

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    © National Instruments|3-9 1,Getting Started with 1,LabVIEWAdding a Warning LightIf you want a visual cue to indicate when a value exceeds a specified limit, you can use a warning light.Complete the following steps to add a warning light to the VI.1.Display the Controls palette by right-clickin...

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    3-10|ni.comChapter 3Analyzing and Saving a Signal7.When the Positioning tool appears, right-click the wire that connects the Peak to Peak output to the Operand 1 input and select Create»Numeric Indicator from the shortcut menu. A Peak to Peak terminal, shown below, appears on the block diagram. ...

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    © National Instruments|3-11 1,Getting Started with 1,LabVIEW2.Wire the Result output of the Greater Express VI to the Warning terminal. The block diagram should appear similar to Figure 3-4.NoteRed coercion dots appear automatically at the Peak to Peak and Warning input terminals to alert you t...

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    3-12|ni.comChapter 3Analyzing and Saving a Signal4.Enter the following text in the File Description text box: Sample of peak to peak values. LabVIEW appends the text you enter in this text box to the header of the file.5.Click the OK button to save the current configuration and close the Configur...

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    © National Instruments|3-13 1,Getting Started with 1,LabVIEWSaving Data When Prompted by a UserComplete the following steps to build a VI that logs data to a file when the user clicks a button on the front panel.1.In the block diagram window, double-click the Write To Measurement File Express V...

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    3-14|ni.comChapter 3Analyzing and Saving a SignalViewing Saved DataComplete the following steps to view the data that you save to the Selected Samples.lvm file.1.Display the front panel and run the VI. Click the Write to File button several times.2.Click the STOP button.3.Open the Selected Sample...

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    © National Instruments|3-15 1,Getting Started with 1,LabVIEWLabVIEW installs the LabVIEW Data directory in the default file directory of the operating system to help you organize and locate the data files LabVIEW generates. Refer to the LabVIEW Help for more information about writing data to an...

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    © National Instruments|4-14Hardware: Acquiring Data and Communicating with Instruments (Windows)LabVIEW has the capability to connect and interact with a large number of hardware devices. This chapter introduces you to two Express VIs that make acquiring data and communicating with traditional, ...

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    4-2|ni.comChapter 4Hardware: Acquiring Data and Communicating with Instruments (Windows)Acquiring a Signal in NI-DAQmxYou will use the DAQ Assistant Express VI to create a task in NI-DAQmx. NI-DAQmx is a programming interface you can use to communicate with data acquisition devices. Refer to the ...

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    © National Instruments|4-3 1,Getting Started with 1,LabVIEWFigure 4-1. Configuring a Task Using the DAQ Assistant

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    4-4|ni.comChapter 4Hardware: Acquiring Data and Communicating with Instruments (Windows)7.In the DAQ Assistant dialog box select the Configuration tab and locate the Voltage Input Setup section. 8.Locate the Settings tab. In the Signal Input Range section enter 10 for the Max value and enter -10 ...

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    © National Instruments|4-5 1,Getting Started with 1,LabVIEWEditing an NI-DAQmx TaskYou can add a channel to the task so you can compare two separate voltage readings. You also can customize the task to acquire the voltage readings continuously.Complete the following steps to add a new channel t...

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    4-6|ni.comChapter 4Hardware: Acquiring Data and Communicating with Instruments (Windows)Visually Comparing Two Voltage ReadingsBecause you have two voltage readings displayed on a graph, you can customize the plots to distinguish between the two.Complete the following steps to customize the plot ...

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    © National Instruments|4-7 1,Getting Started with 1,LabVIEWGetting Started with the Instrument Driver FinderUse the NI Instrument Driver Finder to search for and install LabVIEW Plug and Play instrument drivers without leaving the LabVIEW development environment.TipYou also can visit the NI Ins...

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    4-8|ni.comChapter 4Hardware: Acquiring Data and Communicating with Instruments (Windows)NoteThe NI Instrument Driver Finder displays drivers only for LabVIEW 7.0 or later. If you need to download an older version of an instrument driver, go to the IDNet website actionURI(http://www.ni.com/cgi-bin...

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    © National Instruments|4-9 1,Getting Started with 1,LabVIEWSelecting an Instrument Using the Instrument I/O AssistantIf a driver is not available for an instrument, you can use the Instrument I/O Assistant Express VI to communicate with the instrument.NoteYou must have the Instrument I/O Assist...

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    4-10|ni.comChapter 4Hardware: Acquiring Data and Communicating with Instruments (Windows)Complete the following steps to communicate with the instrument.1.In the Instrument I/O Assistant dialog box, click the Add Step button, expand the pull-down menu, and click the Query and Parse step. 2.Enter ...

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    © National Instruments|4-11 1,Getting Started with 1,LabVIEW3.Highlight the command in the Enter a command text box and click the Add parameter button to add a parameter to the command.4.Enter a default value for the parameter in the Test value text box. 5.Enter a name for the parameter in the ...

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    4-12|ni.comChapter 4Hardware: Acquiring Data and Communicating with Instruments (Windows)Instrument DriversUse the NI Instrument Driver Finder to search for and install LabVIEW Plug and Play instrument drivers without leaving the LabVIEW development environment.An instrument driver is a set of so...

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    © National Instruments|5-15Using Other LabVIEW FeaturesThe previous chapters in this manual introduce you to most of the LabVIEW features you need to build common measurement applications. As you familiarize yourself with the LabVIEW environment, you might find that you need to enhance VIs or th...

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    5-2|ni.comChapter 5Using Other LabVIEW FeaturesClick the Customize button on the pinned Functions palette and select Change Visible Palettes from the shortcut menu to display the Change Visible Palettes dialog box. Then place checkmarks in the checkboxes next to the categories you want to view on...

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    © National Instruments|5-3 1,Getting Started with 1,LabVIEWA knob has an orange border, so you can wire a knob to any Express VI input with an orange label. However, you cannot wire a knob to an input with a green label. The wires you create are the same color as the terminal.Express VIs genera...

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    5-4|ni.comChapter 5Using Other LabVIEW FeaturesWhen to Use Other LabVIEW FeaturesThe Express VIs, structures, and controls and indicators located on the Express subpalettes of the Controls and Functions palettes provide the functionality you need to build common measurement applications. The foll...

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    © National Instruments|5-5 1,Getting Started with 1,LabVIEWtargets. Refer to the Fundamentals»Working with Projects and Targets book on the Contents tab in the LabVIEW Help for more information about using LabVIEW projects.•Access other Windows applications—You can use LabVIEW as a .NET or...

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    © National Instruments|A-1ATechnical Support and Professional ServicesLog in to your National Instruments actionURI(http://www.ni.com):ni.comactionURI(http://www.ni.com): User Profile to get personalized access to your services. Visit the following sections actionURI(http://www.ni.com):of ni.com...

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    © National Instruments|G-1GlossaryAautomatic scalingAbility of scales to adjust to the range of plotted values. On graph scales, autoscaling determines maximum and minimum scale values.Bblock diagramPictorial description or representation of a program or algorithm. The block diagram consists of ...

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    GlossaryG-2|ni.comCchannel1. Physical—A terminal or pin at which you can measure or generate an analog or digital signal. A single physical channel can include more than one terminal, as in the case of a differential analog input channel or a digital port of eight lines. A counter also can be a...

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    1,Getting Started with 1,LabVIEW© National Instruments|G-3Controls palettePalette that contains front panel controls, indicators, and decorative objects.current VIVI whose front panel, block diagram, or Icon Editor is the active window.DDAQSee 78, 78,data acquisition 78,(DAQ).DAQ AssistantA ...

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    GlossaryG-4|ni.comdriverSoftware that controls a specific hardware device, such as a DAQ device.dynamic data typeData type used by Express VIs that includes the data associated with a signal and attributes that provide information about the signal, such as the name of the signal or the date and t...

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    1,Getting Started with 1,LabVIEW© National Instruments|G-5graph2D display of one or more plots. A graph receives and plots data as a block.II/OInput/Output. The transfer of data to or from a computer system involving communications channels, operator input devices, and/or data acquisition and ...

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    GlossaryG-6|ni.commenu barHorizontal bar that lists the names of the main menus of an application. The menu bar appears below the title bar of a window. Each application has a menu bar that is distinct for that application, although some menus and commands are common to many applications.NNI-DAQD...

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    1,Getting Started with 1,LabVIEW© National Instruments|G-7PpaletteDisplays objects or tools you can use to build the front panel or block diagram.plotGraphical representation of an array of data shown either on a graph or a chart.Positioning toolTool to move and resize objects. projectA collec...

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    GlossaryG-8|ni.comstringRepresentation of a value as text.structureProgram control element, such as a Flat Sequence structure, Stacked Sequence structure, Case structure, For Loop, While Loop, or Timed Loop.subpalettePalette that you access from another palette that is above the subpalette in hie...

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    1,Getting Started with 1,LabVIEW© National Instruments|G-9VVI See 84, 84,virtual instrument (VI).virtual instrument (VI)Program in LabVIEW that models the appearance and function of a physical instrument.VXIVME eXtensions for Instrumentation (bus).WwaveformMultiple voltage readings taken at a...

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    © National Instruments|I-1IndexAacquiring 66,information for instruments, 4-9 59,signals, 4-2 22,Acquiring a Signal VI 22,block diagram 22,(figure), 1-14adding 32,See also creating 62,channels to tasks, 62, 4-5 33,controls from the blo 33,ck diagram, 2-5 12,controls to 12, the front panel, 1-4...

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    IndexI-2|ni.com 72,Convert from/to Dynami 72,c 72, Data 72, Express 72,VIs, 5-3creating 32,See also 32, adding 33,controls, 2-5, 40,2-12 33,graph indicators, 33,2-5 40,indicators, 2-12 59,NI-DAQmx tasks, 59, 4-2customizing 40,block diagrams, 2-12 23,controls, 1-15 32,front panels, 2-4 25,indic...

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    1,Getting Started with 1,LabVIEW© National Instruments|I-3 26,controls, 1-18, 3-1 56,4 32,customizing, 2-4 26,indicators, 1-18 35,modifying, 2-7 17,showing, 17, 1-9 43,Warning Light VI 43, (figure), 3-1 70,functions, 5-2 22,Merge Signals, 1-14, 33,2-5Functions palette 19,figure, 1-11 71,showi...

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    IndexI-4|ni.com 68,NI-DAQmx tasks, 68, 4-11 59,creating, 4-2 70,numeric controls, 5- 70,1 13,palette, 1-5Oobjects 16,deselecting, 1-8 16,wiring on the block diagram, 1-8 17,Operating tool, 1-9 27,outputs, Express VI, 27,1-19Ppalettes 19,Arithmetic & Comparison, 19,1-11 12,Controls, 1-4 34,E...

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    1,Getting Started with 1,LabVIEW© National Instruments|I-5U 9,user interface. 9,See front panelV 9,virtual instruments. See VIs 9,VIs, 1-1 29,blank, 2-1 9,building, 1-1 73,customizing menus, 5-4 71,icons, 5-2 29,new, 2-1 73,programmatically controlling, 5-4 73,publishing on the Web, 73, 5-4 1...