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Waveform Charts

Module by: National Instruments. E-mail the author

The waveform chart is a numeric indicator that displays one or more plots. The waveform chart is located on the Controls>>Graph Indicators palette. Waveform charts can display single or multiple plots. Figure 1 shows the elements of a multiplot waveform chart. Two plots are displayed: Raw Data and Running Avg.

Figure 1
Figure 1 (chartelem.png)

Charts use three different modes to scroll data, as shown in the Figure 2. Right-click the chart and select Advanced>>Update Mode from the shortcut menu. Select Strip Chart, Scope Chart, or Sweep Chart . The default mode is Strip Chart.

Figure 2
Figure 2 ( chartmodes.png)

A strip chart shows running data continuously scrolling from left to right across the chart. A scope chart shows one item of data, such as a pulse or wave, scrolling partway across the chart from left to the right. A sweep chart is similar to an EKG display. A sweep chart works similarly to a scope except it shows the older data on the right and the newer data on the left separated by a vertical line. The scope chart and sweep chart have retracing displays similar to an oscilloscope. Because there is less overhead in retracing a plot, the scope chart and the sweep chart display plots significantly faster than the strip chart.

Wiring Charts

You can wire a scalar output directly to a waveform chart. The data type in the waveform chart in Figure 3 terminal matches the input data type.

Figure 3
Figure 3 ( wirechart.png)

Waveform charts can display multiple plots. Bundle multiple plots together using the Bundle function located on the Cluster palette. In Figure 4, the Bundle function bundles the outputs of the three VIs to plot on the waveform chart.

Figure 4
Figure 4 ( wirechartmulti.png)

The waveform chart terminal changes to match the output of the Bundle function. To add more plots, use the Positioning tool to resize the Bundle function.

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Definition of a lens

Lenses

A lens is a custom view of the content in the repository. You can think of it as a fancy kind of list that will let you see content through the eyes of organizations and people you trust.

What is in a lens?

Lens makers point to materials (modules and collections), creating a guide that includes their own comments and descriptive tags about the content.

Who can create a lens?

Any individual member, a community, or a respected organization.

What are tags? tag icon

Tags are descriptors added by lens makers to help label content, attaching a vocabulary that is meaningful in the context of the lens.

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