Download PT690 Vibration Data Collector and Analysis System

PT690 Vibration Data Collector and Analysis System
A type of Cascade or Waterfall plot, usually with a skewed Y axis so that the plot has an isometric
appearance.
* Real Time Analyzer
A term used to describe an instrument which displays a vibration frequency spectrum.
* REBAM
An acronym for Rolling Element Bearing Activity Monitor, which is a ProvibTech method and system for
monitoring and analyzing the performance of rolling element bearings using eddy current transducers and
Micro-PROX .
* Relative Vibration
Vibration measured relative to a chosen reference. Proximity probes measure shaft dynamic motion and
position relative to the probe mounting, usually the bearing or bearing housing.
* Relative Transducer
A proximity probe observing shaft motion relative to the probe mounting, usually the bearing or bearing
housing.
* Repeatability
The ability of a transducer or readout instrument to repeat measurements, under the same conditions,
within narrow limits. Precision is the measure of repeatability.
* Resolution
The smallest change in applied stimulus that will produce a detectable change in the instrument output.
* Resonance
The condition in which a forcing frequency coincides with a natural frequency of the system. A resonance
typically is identified by an amplitude peak, accompanied by a maximum rate of change of phase lag angle.
See Balance Resonance Speed.
* Rod Drop
On a reciprocating compressor, the measurement of the position change of the piston rod relative to a fixed
reference point as the piston drops in the cylinder due to piston rider ring deterioration. The position
measurement can indicate either the average position of the rod over the full stroke or the instantaneous
position of the rod at a specific point in the stroke.
* Rod Drop, Average Position
On a reciprocating machine, the measurement of the average position change of a piston rod over the full
stroke of the piston relative to a fixed reference on the cylinder. This measurement is usually achieved by
evaluating the average dc gap voltage change of a proximity probe mounted to the fixed reference.
ProvibTech
Phone: +1-713-830-7601 Fax: +1-281-754-4972 [email protected] , www.provibtech.com
64