VibraCal Lite Automatic Accelerometer Calibration
System provides NIST Traceability.
Endevco Corporation's new VibraCal Lite is an entry-level priced
automatic calibration system that provides NIST traceable
back-to-back comparison calibration of most accelerometer types,
ranging from charge and voltage type piezoelectric to bridge type
piezoresistive sensors.
VibraCal Lite is well suited for the budget-conscious metrology lab
whose immediate plan is to purchase or lease a state-of-the-art
automatic accelerometer calibration system to both satisfy ISO 9001
requirements and replace outdated calibration instruments.
VibraCal Lite with its modular concept can also satisfy their future
plan to increase the sophistication of this system. Test accelerometer
output could be single-ended or differential, AC or DC coupled, isolated
or grounded. The system complies with ANSI/NCSL Z540-1-1994 and
ISO Guide 17025:2000. The users can easily customize calibration
certificates. Calibration frequency range is 20 Hz to 5 kHz using
stepped sine or random excitation methods. VibraCal Lite System
can be expanded to extended vibration range from 10 Hz to 50 KHz.
Shock module using Endevco POP can be added to provide shock
calibration from 20 g to 10 000 g. VibraCal Lite is also capable of
absolute low frequency calibration by incorporating Laser Doppler
Vibrometer, 2924 long stroke shaker and a fringe counter.
The vibration system utilizes modular design and consists of a
controller, a Brüel & Kjær PULSEÔ Signal Analyzer, and an Endevco
model 2926 shaker. The PULSEÔ Signal Analyzer measures the
auto-spectra of the transducer signals and the cross-spectrum
between them. It then calculates the transfer function between the
two signals. The Signal Analyzer also generates the random noise
or sinusoidal signal supplied to the vibration exciters. The mid-range
frequency shaker has its own integrated power amplifier. System
operational software is based on National Instruments' Windows
LabView.
Test configurations and test data are stored and managed using
Microsoft Access database. Tests may be automatically set up by
recalling a particular test definition file, which is specific to each
transducer model. No operator adjustments are required for the
particular gain, grounding and vibration levels. Computer control
helps eliminate operator error, enhances repeatability, and ensures
optimum signal-to-noise ratio and calibration accuracy.
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For more information, please contact :-
Bruel & Kjaer UK Ltd.
Bedford House, Rutherford, Close, Stevenage, Herts. SG1 2ND. UK
Tel: +44(0) 1438 739000, Fax: +44(0) 1438 739099
E-mail: info@bkgb.co.uk
Website: www.bksv.com
October 2002
