Orbit Viewer

NI InsightCM™ 3.3 Help

Edition Date: December 2018

Part Number: 374498G-01

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Parent Topic: Available Viewers

Supported Sensors: Pairs of displacement sensors that acquire waveforms from orthogonal probes. Configure the following settings on the Properties tab of the Asset Configuration page:

  • Specify the name of the other sensor for the Pair Sensor property of each sensor.
  • Assign the sensors to a data group with a tachometer as the speed reference.
Note   The actual angle between orthogonal probes does not need to be exactly 90 degrees. Angles of 80-100 degrees are typically acceptable.

The Orbit viewer displays the actual shaft centerline movement inside the bearing housing.

Components of an Orbit Viewer

Component Value
  Tachometer pulses
  Viewer reference at (0, 0) Shaft centerpoint
  Sensor angle and rotation direction Rotation direction: Clockwise Displacement Y sensor: -45 degrees
Displacement X sensor: 45 degrees
Note  Click Information on the viewer toolbar to view exact values for sensor angles.

What do you want to do?

Task Action
View the filtered orbit. By default, the viewer displays the unfiltered orbits, as the previous screenshot shows. Click Orbit Type on the viewer toolbar to display the 1x orbit or filtered orbit.
Display orbits for a certain number of revolutions. Click Settings on the viewer toolbar, select the Show fixed number of revolutions checkbox, and enter the number you want in the # revolutions textbox. The viewer displays the first n revolutions in the measurement.
Mark the locations of tachometer pulses. If a measurement is from a sensor with a tachometer reference, you can display bold marks on the curve at each position where a tachometer pulse occurred. Click Settings on the viewer toolbar, and select the Show tachometer reference checkbox. In the previous screenshot, bold dots indicate the position of tachometer pulses along the curve.
Change the rotation direction of the tachometer. On the Properties tab of the Asset Configuration page, set the Rotation Direction as either clockwise or counterclockwise.
Choose between scaling data to the orbit or scale data within the bearing clearance circle. This viewer can scale data so that either the orbit is enlarged or the orbit is displayed within the fixed bearing clearance circle. To show the bearing clearance circle with the orbit inside, click Settings on the viewer toolbar and place a checkmark in the Show bearing clearance for displacement data checkbox.
Customize the bearing clearance circle and shaft resting position. When a viewer shows the bearing clearance circle with the orbit inside, two properties affect the appearance of the circle:
  • Size of bearing clearance circle—The maximum possible orbit of the shaft center point inside the bearing. This property, in turn, is defined by the vertical bearing clearance and the horizontal bearing clearance.
  • Bearing start position—Whether the shaft rests at the top, center, or bottom of the bearing.


Users with appropriate permissions can set these properties for displacement sensors so the bearing clearance automatically displays correctly in the viewer. To correct or change these properties for a displacement sensor, go to the Asset Configuration page and modify the Properties tab for that sensor.

In the following Orbit viewer whose reference is the bearing, the maximum bearing clearance diameter is 25 mils (vertical) by 25 mils (horizontal) and the bearing start position is the bottom of the bearing.

Compensate for DC gap offset when displaying the orbit. To set the gap reference, or DC offset, of the shaft centerline curve to compensate for the resting point of the shaft, configure the Gap Voltage Reference sensor property in the Properties tab of the Asset Configuration page for that sensor The gap reference is a property of the sensors that acquire data.
Tip  If you notice that the configured gap value is incorrect or you want to temporarily use a different value, you can override the gap property with a value that the viewer calculates from sensor data.


Related link: Compensating for DC Gap Offset
Compare measurements from different sources or times. Create a data event reference.

Related link: Comparing Measurements from Different Sources or Times
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.

Related Information

Adding, Changing, and Removing Viewers

Properties Tab on Asset Configuration Page

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