VM600 MPS hardware manual (standard version) MAMPS-HW/E 7 - 3
Edition 17 - February 2018
Broad-band absolute bearing vibration
PROCESSING MODES AND APPLICATIONS
7.2 Broad-band absolute bearing vibration
(1) Description
Absolute vibration is generally measured with seismic transducers mounted on a machine
bearing housing or other mechanical structure. A number of transducers (and matching
signal conditioners) are available from Meggitt Sensing Systems’ Vibro-Meter product line for
this purpose. The following front-end components are the most commonly used:
• CAxxx accelerometer + IPCxxx signal conditioner + GSIxxx galvanic separation
• CExxx accelerometer (current output) with built-in or integrally attached electronics +
GSIxxx galvanic separation
• CExxx accelerometer (voltage output) with built-in electronics
• CVxxx velocity transducer.
Each of the above configurations produces a raw voltage-based signal where the AC
component of the output voltage is directly proportional to the physical quantity measured
(absolute acceleration or absolute velocity).
The MPS is used to process the raw (AC/DC) signal provided by the transducer (and its signal
conditioner). The AC component of the raw signal is proportional to the absolute vibration.
The DC component is used by the MPC4 card's built-in "OK System" to monitor the correct
functioning of the measuring chain between the transducer and the MPC4 itself. It may
therefore be used to detect a problem in the transducer, signal conditioner, galvanic
separation or connecting cables (such as a defective component, short-circuit or open
circuit).
An optional broad-band filter can be added to each channel to reduce unwanted parts of the
frequency spectrum.
It is possible to perform one or two integrations on a signal proportional to absolute
acceleration in order to obtain outputs corresponding to absolute velocity or absolute
displacement. Alternatively, no integration need be performed.
NOTE: The broad-band processing technique is applicable to dynamic pressure
processing as well as vibration processing.
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