LabVIEW in 3 Hours

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LabVIEW in 3 Hours
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What is Test Measurement?
Acoustic Quality
RF Signal Analysis
Keypad Functionality
LCD Testing
Sound Quality
Battery Test
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Engineering Industries
Manufacturing
Telecom
Electronics
Automotive
Test Industries
Semiconductor
Chemical Processing
Aerospace
Transportation
Military
Biomedical
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Instrumentation
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Instrumentation
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Data Acquisition
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Virtual Instrumentation
Application Software
Hardware and Driver Software
Network
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Virtual Instrumentation Architecture
LabVIEW
Instrument / Data Acquisition Drivers
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Section I The LabVIEW Environment

• LabVIEW terms
• Components of a LabVIEW application
• LabVIEW programming tools
• Creating an application in LabVIEW

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LabVIEW Programs Are Called Virtual Instruments
(VIs)
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LabVIEW Programs Are Called Virtual Instruments
(VIs)
2 Work areas
1. Front Panel Controls Inputs to the computer
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LabVIEW Programs Are Called Virtual Instruments
(VIs)
2 Work areas
1. Front Panel Controls Inputs to the
computer Indicators Outputs from the computer
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LabVIEW Programs Are Called Virtual Instruments
(VIs)
2 Work areas
1. Front Panel Controls Inputs to the
computer Indicators Outputs from the computer
2. Block Diagram Instruction set for controls,
indicators Source Code
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LabVIEW Graphical Development Environment
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VI Front Panel
Panel Toolbar
Pull-down menu
Boolean Control
Double Indicator
Waveform Graph
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VI Block Diagram
Pull-down menu
Thermometer Terminal
Data Acquisition Function
Temperature Indicator
Delay
While Loop
Stop Loop Terminal
Stop Button Terminal
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Controls and Functions Palettes
Functions Palette (Block Diagram Window)
Controls Palette (Front Panel Window)
Graphical, floating palettes Used to place
controls indicators on the front panel, or to
build the block diagram
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Tools Palette (Front Panel)

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Tools Palette (Block Diagram)

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Status Toolbar
Run Button Continuous Run Button Abort
Execution Pause/Continue Button Text
Settings Align Objects Distribute
Objects Reorder
Additional Buttons on the Diagram Toolbar
Execution Highlighting Button Step Into
Button Step Over Button Step Out Button
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Status Toolbar
Run Button Continuous Run Button Abort
Execution Pause/Continue Button Text
Settings Align Objects Distribute
Objects Reorder
Additional Buttons on the Diagram Toolbar
Execution Highlighting Button Step Into
Button Step Over Button Step Out Button
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Open a Virtual Instrument
Basic Spectral Measurement.vi
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Template Browser
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Create a New VI
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Creating a VI Front Panel
Front Panel Window
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Creating a VI Front Panel
Front Panel Window
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Creating a VI Block Diagram
Block Diagram
Front Panel Window
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LabVIEWs Context Help
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Creating a VI Adding Functions
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Creating a VI Adding Functions
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Creating a VI Wiring
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Creating a VI Adding Functions
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Creating a VI Adding Functions
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Express Functions
Same overall functionality
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Section II

• What is a subVI?
• Creating a subVI
• Using a VI as a subVI

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SubVIs

• LabVIEW is modular
• Any VI can be used as a subroutine (or subVI) to
  other programs
• Advantages
• Modular
• Easier to debug
• Dont have to recreate code

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Creating a SubVI

1. Create code
2. Select code for use in subVI
3. Click Edit-Create subVI

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Editing a SubVI
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Insert the SubVI into a Top Level VI
Accessing user-made subVIs Functions gtgt Select a
VI Or Drag icon onto target diagram
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Create SubVI from your code
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View your subVI
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Section III Data Acquisition

• Data acquisition (DAQ) basics
• Connecting Signals
• Simple DAQ application

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DAQ Data Acquisition

• Plug-in board for a computer with
• Analog input channels
• Analog output channels
• Counters
• Digital I/O
• Controlled by a suite of LabVIEW VIs
• FunctionsgtgtData Acquisition

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DAQ DataAcquisition
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Hardware Connections
BNC-2120
SC-2075
SCB-68
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Channel Connections
Signal
Motor
Single-Ended Measurement
Ground
Battery

Signal 1
Differential Measurement
-
Signal 2
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Analog Signals
Data Acquisition System
1.659487387 volts
1010100111110
ADC
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Digital Signals
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Measurement Automation Explorer
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Channel Connections
Channel Connections

• Single-Ended Mode ACHx and AIGND used to
  connect signal to channel x
• Differential Mode ACHx, ACHx8 used to connect
  signal to channel x

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Section IV Loops and Charts

• For Loop
• While Loop
• Charts
• Graphs

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Loops

• While Loops
• Terminated by condition
• Always Runs Once
• Delay between iterations may be added

• For Loops
• Terminate after N iterations
• N specified on block diagram

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Loops (cont.)

1. Select the loop
2. Enclose Code to Repeat

While Loop
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Charts and Graphs

• Waveform Charts display a history of values over
  time
• - Strip Chart (continuous scrolling)
• - Scope Chart (repeatedly redraws over the same
  region)
• - Sweep Chart (redraws curve to the right of
  the old curve)

Waveform Graphs and X-Y Graphs - Wavefrom
Graphs plot Y for regular increments of X - X-Y
Graphs plot Y vs. X for any X-Y sets (non-regular)
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Charts

• Waveform chart special numeric indicator that
  can display a history of values
• Controls gtgt Graphs gtgt Waveform Chart

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Wiring Data into Charts

• Single Plot Charts

• Multiplot Charts

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Combining data onto one graph
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File I/O Using The LVM Express Function
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File I/O Using Traditional Functions
Easy File I/O VIs

• Read/write to spreadsheet file
• Read/write characters to file (ASCII)
• Read lines from file
• Read/write binary file

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Conclusion

• See www.ni.com for more help, examples