Rockwell Automation 441-PEN25 Enpac Ex Data Collector - Manual (Page 131)

Publication GMSI00-UM001A-EN-E - February 2005
Glossary 125
current data collector
Emonitor can communicate with only one data collector at a time. This data
collector is called the current data collector. You can select only one current
collector for load and unload operations.
current list
The most recently recalled or created set of measurement definitions held in
the computer’s memory or saved on the computer’s hard disk. You can load
the current list into a data collector for data collection. You can also view plots
or create a report from the data associated with the current list.
cursor
A line or symbol that traces the data and provides an accurate read out of the
X axis (typically time or frequency) and the Y axis (typically vibration
amplitude) values.
data collector
A data collector is a device that measures and stores vibration and other data.
Vibration data may include magnitude, spectrum, time waveform, and phase
data. Other data may include process measurements such as pressure,
temperature, and operating hours.
database
One or more related files that contain information on a common topic. The
Emonitor database contains both the hierarchical setup for the machinery as
well as the data collected from the machinery.
ESP measurement
A magnitude measurement using Envelope Spectrum Processing (ESP). This
is a magnitude acceleration measurement with an envelope filter, used to
identify faults in rolling element bearings.
enveloping
A technique for creating spectrum alarms that lest you allow for variations in
the speed of your equipment. Enveloping widens the spectrum alarm around
the peaks in the spectrum, either by a constant amount or by a percentage of
the frequency. The advantage of using a percentage of the frequency is that the
width of the envelope increases with the frequency.
TIP
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The current data collector is different from the active data
collector.