Rockwell Automation Publication 1441-UM001B-EN-P - September 2012 169
Chapter
6
Multi-channel Measurements
This chapter describes setting up, collecting, and reviewing orbit, cross channel
phase, dual channel, and other multi-channel measurements.
Two Channel
Measurements
The Two Channel functionality offers advanced data collection in route and
Offroute collection. With two channels, you can take the following
measurements:
• Orbits
• Simultaneous 2-channel magnitude, time waveform and spectra
• Cross channel phase
Predictive Maintenance Program
An effective predictive maintenance program is typically based on the collection
and analysis of routine vibration data, supplemented by other technologies, such
as oil analysis, thermography, and motor current analysis. The detection of most
common machine faults and the location of faulty components can be
accomplished with a single-channel data collector measuring vibration, combined
with a personal computer-based trending analysis software package. In many
cases, however, a more thorough analysis requiring a dual channel acquisition
capability is necessary to accurately identify specific faults.
Having access to two channels of information in simultaneous data acquisition is
key to root-cause failure analysis. Making the measurements independently (and
asynchronously) and calculating the relationship does not work well because of
the effects of signal variations, outside disturbances, and noise in the system.
Topic Page
Two Channel Measurements 169
Orbit Measurements 170
Cross Channel Phase Measurements 182
Collect a Cross Channel Phase Measurement 188
Dual Channel Measurements 192
Collect an Offroute Dual Channel Measurement 193
Collect a 4-channel Measurement 197
Collect Multi-channel Measurements 198
Collect a Tri-axial Measurement 202
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