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Air Bearing Shaker
Air Bearing Shaker

News & Events

January 5, 2006

THE MODAL SHOP, INC. announces a new calibration grade air bearing shaker, Model K394A31 that extends the upper frequency range to 20 kHz.  The secret is an ultra-light, ultra-stiff solid beryllium armature and core that allows for a frequency range of 2 Hz to 20 kHz.

The Model K394A31’s unique suspension system virtually eliminates transverse lateral motion – providing an air cushion – and adjusts easily to calibrate a range of accelerometer sizes.  No more rubber bands.  This allows for more accurate and efficient results, particularly in rugged, frequent day-to-day use, as well as faster calibration cycle times versus other air bearing shakers.  Utilizing a mechanical spring armature design, traditional electromechanical shakers have the physical limitation of introducing transverse movement into the measurement.

An integral reference accelerometer mounted within a beryllium core 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 K394A31 and companion K394A30 (2 Hz to 15 kHz) 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 9155C Accelerometer Calibration Workstation.

For more information about how the K394A31 air bearing shaker or the 9155C Accelerometer Calibration Workstation can benefit your operations, contact THE MODAL SHOP, INC., 3149 E. Kemper Road Cincinnati, OH 45241-1516, Internet:, (800) 860-4867, Fax (513) 458-2172 or e-mail:  The Modal Shop is a PCB Group Company.