Glossary
a-weighting A frequency shaping method that can be applied to a spectra based upon the
frequency response of the human ear. The resulting spectra represents the loudness
of the various levels as they would appear to the human ear.
alarm An indication that the parameters of a machine have changed in a significant
manner.
alarm limits Amplitude levels that define an alarm condition on the equipment being monitored.
alert An alarm limit calculated by the software which indicates that equipment is
approaching failure. Designated as a "C" alarm in reports.
aliasing An effect that results in erroneous frequency spectra when the frequency of the
signal being sampled is more than 0.5 times the sampling rate. CSI Machinery
Health Analyzers include anti-aliasing filters that eliminate these errors.
alignment A condition where the shaft centerline of one machine element coincides with the
centerline extension of another machine during operation.
amplification Increasing signal amplitude by a desired amount in order to facilitate further
processing of the signal.
amplification factor Mechanical magnification of the true imbalance effect.
amplitude Indicates the strength (magnitude in RMS, peak, peak-to-peak, average, or D.C.) of a
measured signal.
analysis parameter
set
Includes individual analysis parameters, and also contains instructions that tell the
analyzer how to acquire data.
analysis parameters Divides the frequency spectrum into bands that are individually measured and
analyzed.
ball pass frequency
(inner), BPFI
For rolling element bearings, the ball pass frequency (inner), a defect in the inner
race of a bearing.
ball pass frequency
(outer), BPFO
For rolling element bearings, the ball pass frequency (outer), a defect in the outer
race of a bearing.
ball spin frequency,
BSF
Bearing ball spin frequency for rolling element bearings.
bandwidth The analysis frequency range, from lowest to highest, over which data will be
collected. Bandwidth is specified with a minimum and maximum frequency.
baseline A reference spectrum, usually the first spectra collected on a measurement point.
calibration The procedure by which instruments and transducers are checked and adjusted in
order to obtain accurate readings.
component Equipment is made up of one or more components. A component has its own set of
Measurement Points. Components include motors, gearboxes, fans, and pumps, for
example.
correction weight Weight required to correct imbalanced mass.
cross effect Influence exerted by the imbalance in one plane on the vibration of another plane.
cursor A manually controlled marker that can be moved across a spectrum or waveform
plot display indicating time or frequency and amplitude at the cursor location.
Glossary
MHM-97432 Rev 7 385
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