Measurement Computing eZ-TOMAS rev.11.0 - Manual (Page 66)

Orbit Displays
Orbit Displays show simultaneous time domain vibration amplitude for an X and Y probe pair.
The location of each Tach pulse is shown on the orbit plot using black circles; and a rotation direction label
("CCW" or "CW") is shown next to these (see figure).
The default display is “Full Block” of time data. However, a specific number of Shaft Revolutions can be
displayed (1, 2, 5, or 10) by using the associated pull-down list (see figure). The orbit display is corrected
for probe location.
You can optionally overlay the orbit onto a shaft center line display by clicking the Shaft Centerline
button. The center of the orbit trace in SCL computes the difference between the current gap voltage and
the reference gap voltage. Information regarding shaft centerline plots is presented on page 7-9.
To display an overlay of the bearing circle clearance, as indicated below (third plot), click the
button (see figure).
Note: Only one probe pair can be shown on the Orbit Display.
Orbit Shaft Shaft
Display Centerline Revolutions
(see pg. 7-9) Filter (Note 1)
Display
Cursor
Values
Cursor
Update
(Peak
Search)
Overlay
Bearing
Clearance
Circle
Three Orbit Plots and a Time Waveform Plot Display
In this figure the plot at the upper right has focus.
7-4 Display Menu … Plots Plot Examples 937594 eZ-TOMAS