Note
This measurement is not available on single-channel analyzers. For orbit plots, the analyzer uses the
lowest input channel for the X axis and the next input for the Y axis. For a two-channel orbit using
inputs A and C, A =X and C= Y. If you use inputs B and D, B=X and D=Y. For a four-channel dual orbit,
A=X1, B=Y1, C=X2, and D=Y2. A and B are used for the first orbit, and C and D are used for the second
orbit.
Prerequisites
Mount two displacement probes radially 90 degrees apart. Displacement probes are the
preferred sensor, and units should be displacement.
Procedure
1.
Create a job.
2. From the Analyze main menu, press F7 More Experts > F10 Orbit Plot.
3. Press Start or Enter to collect the data.
4. Enter the shaft turning speed.
5. Press Enter.
6. Press Stop to view the plot.
7. Press F9 Store Data to save the data to a route or a job, or press F8 Start to redo the
measurement.
Common orbit shapes
The orbit shapes indicate machine condition. The list below describes some common
shapes and their meaning.
• A large diameter circle may indicate imbalance.
• A sharp oval may indicate resonance.
• A stationary circle within a circle may indicate misalignment.
6.8.19 Cross Channel Amplitude/Phase
Cross Channel Amplitude/Phase determines the phase shift between two sensor locations. This
measurement is useful to determine the phase shift between two sensor locations at a
particular frequency. You can also use this measurement to distinguish between
imbalance and misalignment or between imbalance and resonance by measuring the cross
channel-phase at running speed.
Note
This measurement is not available on single-channel analyzers.
Note
If you marked a peak in a spectrum before selecting Cross Channel Amplitude/Phase, the phase is
determined for the marked frequency. If you did not mark a peak, enter the frequency to measure.
Analyze and Advanced Analyze
136 MHM-97432 Rev 7
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