Rockwell Automation 1441-PEN25-Z Enpac 2500 Data Collector - Manual (Page 316)

316 Rockwell Automation Publication GMSI10-UM002D-EN-E - August 2012
Glossary
band sum Also called band limited overall value. This is the total energy in a spectrum
between two frequencies. If the band contains the entire spectrum, the band sum
value is the same as the magnitude value for the entire spectrum.
baseline measurement A reference measurement you identify from the archive data for a measurement
definition. It indicates the proper operating condition of a piece of equipment.
You can use it as a comparison to other measurements, and in alarms.
collection specification The collection specification defines the parameters used when collecting a
measurement. This includes the type of transducer, windowing factor, signal
detection, frequency range, resolution, number and types of averages, and
whether to collect phase and order normalize the measurement.
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. The current data collector is different
from the active data collector.
current list The most recently recalled or created set of measurement definitions held in the
computers memory or saved on the computers 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.
full scale value The maximum expected amplitude (Y-axis) value for the data. If the data exceeds
the full scale value, it may not be possible to display or collect the full amplitude
range without adjusting the full scale value. In general, the full scale should be the
smallest value that is greater than the largest possible amplitude of the data.