Filter - An electronic device designed to pass or
reject a specific frequency band.
Flattop Window - DSA window function which
provides the best amplitude accuracy for
measuring discrete frequency components.
Free Running - A term used to describe the
operation of an analyzer or processor which
operates continuously at a fixed rate, not in
synchronism with some external reference
event.
Frequency - The repetition rate of a periodic
event, usually expressed in cycles per second
(Hz), cycles per minute (CPM), revolutions per
minute (RPM), or multiples of running speed
(orders). Orders are commonly referred to as
1X for running speed, 2X for twice running
speed, and so on.
Frequency Domain - An FFT graph (amplitude
vs. frequency).
Frequency Range - The frequency range
(bandwidth) over which a measurement is
considered valid. Usually refers to upper
frequency limit of analysis, considering zero as
the lower analysis limit.
Gap - (See Probe Gap.)
Global Bearing Defect - Relatively large
damage on a bearing element.
Hanning Window - DSA window function that
provides better frequency resolution than the
Flattop window, but with reduced amplitude
accuracy.
Hertz (Hz) - Cycles per second. CPM/60.
Hierarchy - A method of organizing equipment
into logical groups or physical areas for ease of
access in the @ptitude Analyst database. This
format consists of Main SETs, Sub-SETs,
machines, and measurement POINTs.
High Pass Filter - A filter with a transmission
band starting at a lower cutoff frequency and
extending to (theoretically) infinite frequency.
Imbalance - A condition such that the mass of a
shaft and its geometric centerlines do not
coincide.
Keyphasor Phase Reference Sensor - A signal
used in rotating machinery measurements,
generated by a sensor observing a
once-per-revolution event. (Keyphasor is a
Bently-Nevada trade name.)
Linear Averaging - In a DSA, averaging of time
records that results in reduction of
asynchronous components.
Lines - Common term used to describe the
filters of a DSA (e.g., 400 line analyzer).
Low Pass Filter - A filter whose transmission
band extends from an upper cutoff frequency
down to DC.
Multi-Parameter Monitoring - A condition
monitoring method that uses various
monitoring technologies to best monitor
machine condition.
Natural Frequency - The frequency of free
vibration of a system. The frequency at which
an undamped system with a single degree of
freedom will oscillate upon momentary
displacement from its rest position.
Orbit - The path of shaft centerline motion
during rotation.
Overlap Processing - The concept of
performing a new analysis on a segment of data
in which only a portion of the signal has been
updated (some old data, some new data).
Peak Spectra - A frequency domain
measurement where, in a series of spectral
measurements, the one spectrum with the
highest magnitude at a specified frequency is
retained.
Phase - A measurement of the timing
relationship between two signals, or between a
specific vibration event and a keyphasor pulse.
Phase Reference - A signal used in rotating
machinery measurements, generated by a
sensor observing a once-per-revolution event.
Phase Response - The phase difference (in
degrees) between the filter input and output
signals as frequency varies; usually expressed
as lead and lag referenced to the input.
Phase Spectrum - Phase frequency diagram
obtained as part of the results of a Fournier
transform.
POINT - Defines a machinery location at which
measurement data is collected and the
measurement type.
Glossary - 2 SKF Microlog - GX Series
User Manual
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