labview in 3 hours. what is test & measurement? keypad functionality keypad functionality lcd...
TRANSCRIPT
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LabVIEW in 3 Hours
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What is Test & Measurement?
KeypadFunctionality
KeypadFunctionality
LCDTesting
LCDTesting
SoundQuality
SoundQuality
AcousticQuality
AcousticQuality
RF SignalAnalysis
RF SignalAnalysis
Battery Test Battery Test
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Engineering – IndustriesTelecom
Chemical Processing
Electronics
Military
Aerospace
Biomedical
Transportation
Semiconductor
Automotive
Manufacturing
TestIndustries
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Instrumentation
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Instrumentation
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Data Acquisition
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Hardware and Driver Software
Virtual Instrumentation
Application Software
Network
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Virtual Instrumentation Architecture
LabVIEW
Data Acquisition and Signal Conditioning VisionPXI/CompactPCI Distributed I/O PLCsGPIB/Serial
and VXIModular
Instrumentation
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 PanelControls = Inputs to
the computer
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2 Work areas:
LabVIEW Programs Are Called Virtual Instruments (VIs)
1. Front PanelControls = Inputs to
the computerIndicators = Outputs
from the computer
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LabVIEW Programs Are Called Virtual Instruments (VIs)
2. Block DiagramInstruction set for
controls, indicators“Source Code”
2 Work areas:
1. Front PanelControls = Inputs to
the computerIndicators = Outputs
from the computer
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BooleanControl
DoubleIndicator
Waveform Graph
Panel ToolbarVI Front Panel
Pull-downmenu
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VI Block Diagram
Thermometer Terminal
DataAcquisitionFunction
While Loop
Stop ButtonTerminal
Stop LoopTerminal
TemperatureIndicator
Delay
Pull-downmenu
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Controls and Functions Palettes
Graphical, floating palettes
Used to place controls & indicators on the front panel, or to build the block
diagram
Functions Palette(Block Diagram Window)
Controls Palette(Front Panel Window)
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Operating Tool
Positioning/Resizing Tool
Labeling Tool
Coloring Tool
Tools Palette (Front Panel)
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Operating Tool
Positioning/Resizing Tool
Labeling Tool
Coloring Tool
Wiring Tool
Breakpoint Tool
Probe Tool
Tools Palette (Block Diagram)
Automatic Selection
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Run Button
Continuous Run Button
Abort Execution
Pause/Continue Button
Text Settings
Align Objects
Distribute Objects
Reorder
Execution Highlighting Button Step Into Button
Step Over Button
Step Out Button
Additional Buttons on the Diagram Toolbar
Status Toolbar
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Run Button
Continuous Run Button
Abort Execution
Pause/Continue Button
Text Settings
Align Objects
Distribute Objects
Reorder
Execution Highlighting Button Step Into Button
Step Over Button
Step Out Button
Additional Buttons on the Diagram Toolbar
Status Toolbar
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Basic Spectral Measurement.viOpen a Virtual Instrument
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Template Browser
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Create a New VI
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Front Panel Window
Creating a VI – Front Panel
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Front Panel Window
Creating a VI – Front Panel
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Front Panel Window
Creating a VI – Block DiagramBlock Diagram
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LabVIEW’s Context Help
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Creating a VI – Adding Functions
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Creating a VI – Adding Functions
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wiring toolWire attachment points (nodes) flash when the wiring tool is passed over
Creating a VI – Wiring
Right Click Node Terminals (communication ports)
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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– Don’t have to recreate code
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Creating a SubVI
1. Create code2. Select code for use in
subVI3. 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 >> 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 VIsFunctions>>Data Acquisition
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DAQ – DataAcquisition
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Hardware Connections
BNC-2120
SCB-68
SC-2075
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Channel Connections
+
-
Differential
Measurement
Single-Ended
MeasurementGround
SignalMotor
Battery Signal 1
Signal 2
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Analog Signals
1.659487387 volts 1010100111110ADC
Data Acquisition System
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Digital Signals
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Measurement & Automation Explorer
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Channel Connections
• Single-Ended Mode: ACHx and AIGND used to connect signal to channel x
• Differential Mode: ACHx, ACHx+8 used to connect signal to channel x
Channel Connections
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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.)
While Loop
1. Select the loop
2. Enclose Code to Repeat
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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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ChartsWaveform chart – special numeric indicator
that can display a history of valuesControls >> Graphs >> 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
•Read/write to spreadsheet file
•Read/write characters to file (ASCII)
•Read lines from file
•Read/write binary file
Easy File Easy File I/O VIsI/O VIs
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Conclusion
• See www.ni.com for more help, examples