Waterfall Viewer

NI InsightCM™ 3.3 Help

Edition Date: December 2018

Part Number: 374498G-01

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Parent Topic: Available Viewers

Supported Sensors: Vibration sensors that acquire waveform data, such as acceleration.

The Waterfall viewer displays the spectra of successive measurements from a sensor simultaneously. This viewer is useful for showing how spectral data changes over time.

What do you want to do?

Task Action
Select the source sensor. If you have more than one feature selected in the asset tree, you can select the source sensor for the viewer by clicking Choose Assets on the viewer toolbar.
Set the number of spectra. Click Settings on the viewer toolbar and enter a value in the Maximum data sets field.
Note   You cannot select the exact spectra you want to display because the Waterfall viewer always displays spectra based on the time range and number of spectra you set rather than specific data sets. For more information about this limitation and how to work around it, refer to Limitations in Selecting Spectra.
Change the x-axis frequency units to Hz, CPM, or orders. Click Unit and select the units you want.
Apply single or double integration or differentiation to data. Click Integration on the viewer toolbar and select an option from the resulting dialog box.

Related link: Integrating and Differentiating Data
Zoom in and out of the chart. Scroll your mouse to zoom in and out.
Change the range of the frequency axis. Click Spectrum Averaging on the viewer toolbar, select the Frequency Axis (display) checkbox, and enter the maximum frequency you want to set in the Fmax field.
Scale data according to RMS, peak, or peak-to-peak values. Expand the navigation menu and select Options. Click Units and Scaling under Data Viewer, and then configure the options under Spectrum Scaling so the data automatically scales.
Select the source sensor. If you have more than one feature selected in the asset tree, you can select the source sensor for the viewer by clicking Choose Assets on the viewer toolbar.
Disable auto-scaling to manually set the scale for the viewer. Click Set Scale on the viewer toolbar. Uncheck Auto-scale and set the maximum and minimum values you want the viewer to use.

Limitations in Selecting Spectra

You cannot select the exact spectra you want to display because the Waterfall viewer always displays spectra based on the time range and number of spectra you set rather than specific data sets.

To refine which spectra are displayed, you can set a custom time range in the Trend viewer. The Waterfall viewer automatically updates to match the time range of the Trend viewer. For example, if you have trend data for a period of 30 days but are only interested in the spectra from the last 25 days, you can set the time range for the trend to just include data from the last 25 days. Alternatively, you can open individual Spectrum viewers in separate windows to compare measurements from different sources or times.

Example

In this example, the Waterfall viewer and Info dialog box show the following characteristics:

  • The viewer is configured to display a maximum of ten spectra from sensor measurements.
  • The Info dialog box indicates the order in which spectra appear in the viewer from front to back. The most recent spectra is the curve at the back of the viewer.
  • The bottom of the viewer shows cursor values for the spectrum you hover over.

Related Information

Showing, Hiding, and Removing Viewer Data

Adding, Changing, and Removing Viewers

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