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| Generator |
| Frequency Range: |
10Hz-10kHz |
5Hz-50kHz |
1mHz-100kHz |
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| Test Profiles |
| Type: Frequency Step: |
Manual |
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| Frequency
Sweep: |
Manual |
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| Amplitude
Step: |
Manual |
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Amplitude Control
(during frequency step or sweep): |
Manual |
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| Results |
| Display: Text or Graphic: |
Displayed text |
Graphic - amplitude and phase |
| System includes |
| Inputs: ReferenceTransducer |
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| Signal
Conditioning |
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| Power
Amplifier |
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| Shaker |
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| Outputs: Serial Port (RS 232) |
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| Parallel
Port (Centronics) |
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| Floppy
Disc |
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| IEEE
488 |
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| Compatibility |
| 801A Precision Dual Channel amplifier |
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integral |
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integral |
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| 801B Precision DC Amplifier |
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| MS Windows Interface |
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| ODBC Database |
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| User-customisable Certificate |
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| Microphone Calibration Software |
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Across a wide
variety of industries, the ability to measure vibration
accurately has become essential.
Vibration is recognised as a vital indicator of machinery
health, often providing the earliest indicator of a potential
failure. Trends in vibration levels - often over long
periods - are used in condition -based maintenance systems
to extend the period between overhauls and increase the
plant productivity.
Rigorous vibration testing is also an essential ingredient
in the development of products able to withstand the rigours
of the intended working environment.
Virtually every component, from the vehicle's structural
frame and suspension system to light assemblies or the
audio system, must be tested thoroughly to ensure that
it will continue to function throughout the lifetime of
the product. |
With the increasing use of vibration analysis techniques,
it has become apparent that a simple calibration of the
transducer by a one-off measurement is rarely sufficient.
Measurements must not only be accurate, they must also
show excellent repeatability over months, or even years.
In plant machinery monitoring, where very small changes
in vibration need to be detected over a period of months,
every effort must be made to remove measurement inaccuracies.
Failure to do so could result in catastrophic machine
failure or increased downtime due to unnecessary maintenance.
As the primary measurement device, the performance of
the transducer is paramount to this process. Regular,
accurate calibration under known conditions is essential.
Beran's extensive range of transducer calibration products
provides all you need to ensure the integrity of your
vibration test programme. A variety of devices and techniques
are used to measure vibration, depending on the frequency
ranges of interest, the amplitude of the vibration and
the environmental conditions required. The units of vibration
measurement can be acceleration, velocity or displacement
and the results expressed or displayed as any of these
parameters with comparisons made between them. Inaccuracies
on the measured results taken from the transducer will
result in much larger variations after subsequent data
processing, and may give an unacceptable measurement uncertainty.
Transducers that are regularly calibrated and have a known
performance envelope will provide reliable data on which
important decisions can be made with confidence.
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As far as possible, all measurement parameters in a calibration
set up should be known, understood and repeatable. The
frequency and amplitude experienced by the unit under
test are not solely dependent on the accuracy and stability
of the stimulating source. The response of the drive electronics
to the shaker and the ability of the shaker control system
to maintain the required profile also affect it.
The frequency response characteristics of the transducer
amplifiers must also be known and compensated for.
For calibration purposes, a sinusoidal drive signal is
preferable to other waveforms.
It is:
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precise, stable and repeatable
•
faster and more accurate
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able to cancel out noise and harmonics
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