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LabVIEW Charts & GraphsCreating a Graph:• To create a Waveform Graph, pop-up on the
Front Panel > Controls > Graph >
Types of Charts & Graphs
• Waveform Chart: special numeric indicator that can display a history of values acquired at a constant rate.
• Waveform Graph: special numeric indicator that displays an array of data. Updates after all points have been collected.
• XY Graph: Displays data acquired at a non-constant rate, such as two columns or arrays data.
• Digital Waveform Graph: Displays data as pulses or groups of digital lines.
• (Windows) 3D Graphs: Displays 3D data on a 3D plot
Types of Charts & Graphs
Waveform Chart
Waveform Graph
XY Graph
Digital Waveform Graph3D Graph
Waveform Charts
Accumulates after new run
Waveform Charts
Waveform Charts
Waveform Charts• Chart Update ModesThe waveform charts use various modes to display data. These modes
include Strip Chart, Scope Chart, and Sweep Chart.
Waveform Charts
Waveform Graphs
Waveform Graphs
Waveform GraphsBuild a sine waveform
Waveform XY Graphs
Also you can use merge to plot two signals of xy in one graph by merging the x’s together and y’s together andenter both to xy graph
Waveform XY Graphs
Waveform & XY Graphs
XY Graphs & Planes• There are many planes in the xy graph. Such planes like
Nyquist, S plane, Z plane and Nichols
XY Graphs & Planes
Digital Waveform Graph
Digital Waveform Graph
3D Graph3D parametric graph: creates a 3D graph control to draw a complex surface in 3D space. The control is wired to a subvi that takes in the data representing the surface.
3D Graph3D surface graph: creates a 3D graph control to draw a
surface in 3D space. The control is wired to a subvi that takes in the data representing the surface
3D Graph• 3D curve graph: creates a 3D graph control to draw a line in
3D space. The control is wired to a subvi that takes in the datarepresenting the line
Other chart/graph types available
Polar plot indicator Smith plot indicator
Min-Max plot indicator Distribution plot indicator
Radar plot indicator Picture
Data types:
Charts & Graphs Features• Plot Legend: Defines the color and style of the plot(s). Resize
the legend to display multiple plots.
• Scale Legend: Defines labels for scales and configures scale properties.
• X Scale and Y Scale: Formats the x- and y-scales.
• Cursor Legend (graph only): Displays a marker at a defined point coordinate. You can display multiple cursors on a graph.
• Scrollbar (chart only): Scrolls through the data in the chart. Use the scroll bar to view data that the buffer does not currently display.
Example
Assignment1- Sketch the function x3+2x2+3cos(x) given the inputs: (use For Loop structure)
– the value of xmin– the value of xmax– the step value
2- Figure below shows a simple level control system in which a closed or opens the valve by a relay. Input flow is not controlled. The relay opens the valve if output voltage greater or equal 6.0 V and closed below that. The level sensor has a transfer function of Vh=0.8h+0.4 V
• find the value of amplifier gain, K, required to open the valve when the level reached 2m
• show two LEDs indicators that tell if the valve is opened or closed
Assignment
3) The tank shown below has the following Boolean variables:flow rates QA, QB and QC; Pressure P; Level LAll are high if the variable is high (true) and low (false) otherwiseDesign a labview VI to give two alarms (LEDs) as follow:
OV (overfill) alarm when:• if either input flow rate is high while the output flow rate QC is low, the pressure is low and the level is
high.• If both flow rates are high while the output flow rate is low and pressure is low.EP (empty) alarm when:• if both input rates are low, the level is low and the output flow rate is high• if either input flow rate is low, the output flow rate is high an the pressure is high.
Assignment4)• The output voltage is as follows:• Vout = Vin when -2 <Vin<2• Vout = 2 V when Vin>2• Vout = -2 V when Vin<-2• Using Labview, if Vin is sine wave, sketch
1. Vin vs time graph2. Vo vs. time graph3. Vin and Vo vs time graph 4. Vo vs Vin graph