PRECISION VIBRATION CALIBRATION
The Models K394B30 and K394B31 Air Bearing Calibration
Shakers represent a new level of performance in calibration
grade shakers. Continuing the award-winning PCB Piezotronics
tradition of providing superior performance characteristics, Air
Bearing Shakers offer ease-of-use while coupled with exceptional
value and simplicity. A graphite air bearing combined with an
ultra-stiff lightweight armature essentially eliminates transverse
motion that plagues traditional flexure-based shaker armature
suspension systems.
Unlike other air bearing shakers that use rubber bands to adjust
and balance the armature, the Air Bearing Shakers from The
Modal Shop use a unique Lorentz force lifting mechanism making
calibration of various accelerometer sizes quick and easy. An
integral reference accelerometer mounted within a beryllium
insert has a mounted resonance greater than 70 kHz, permitting
the shaker to be used for resonance searches to over 50 kHz, while
effectively eliminating the need for complicated mass loading
corrections. In addition, this innovative two-part armature design
provides electrical isolation of the sensors, improving accuracy
by eliminating electrical noise in the calibration measurement. The
included SmartAmpTM power amplifier makes system operation
over 92% efficient and protects the shaker by automatically
shutting down when there is no air flow to the shaker.
These shakers were specifically designed for use in the
demanding environment of high-volume, production-comparison
accelerometer calibration systems such as The Modal Shop’s
Model 9155 Accelerometer Calibration Workstation.