Rockwell Automation 1441-DYN25-Z Dynamix 2500 Data Collector - Manual (Page 142)

142 Rockwell Automation Publication 1441-UM001B-EN-P - September 2012
Chapter 5 Collecting and Reviewing Data
Collect a Spectrum Measurement
One of the most useful ways to display vibration signals is in a spectrum. The
spectrum displays the vibration signal level in relation to the frequencies at which
the vibration occurs.
To display a spectrum, the Dynamix 2500 data collector analyzes the frequency
components of the signal and breaks this analysis down to a number of frequency
bands where the signal level for that band is represented by a single value. These
bands are calstatus indicator lines.
A typical spectrum could have 400 lines although the data collector lets you to
select a smaller or larger number of lines. The higher the lines, the higher the
resolution, and the longer it takes the data collector to acquire the data for a
spectrum.
Lines of resolution, Fmax, and number of averages all affect the length of time it
takes to acquire and process a spectrum. You can control each of these setup items
either in your computer software for route measurements or on the User screen
for Offroute measurements.
See Create and Collect a User-defined Point on page 152 for more
information about Offroute measurements.
Once you have created a route in the Emonitor Software and uploaded it to the
data collector you can begin to take the measurement.
See the Emonitor User Manual publication, EMONTR-UM001 for
information about creating routes and loading them into the data collector.