Air-bearing vibration exciter Spektra APS 113-AB

Air-bearing ELECTRO-SEIS® Long Stroke vibration exciter, especially developed for the calibration and testing for low frequency sensors and sensor charcterization.

Specification

The APS 113-AB ELECTRO-SEIS® air bearing shaker is a long stroke, electrodynamic force generator specifically designed to be used for calibration and evaluation of accelerometers and other motion transducers. It provides excellent properties for low frequency excitation of such devices. Furthermore it is optimized for measuring decay rates in very lightly damped structures.

The APS 113-AB ELECTRO-SEIS® shaker, the air bearing version of the APS 113 ELECTRO-SEIS® shaker, is a long stroke, electrodynamic force generator, designed for calibration and evaluation of accelerometers and other motion transducers.

Air lubricated bushings replace the linear ball bearings used in the basic ELECTRO-SEIS® armature guidance system. In addition an air distribution system, tie down and leveling base are provided. The near zero friction of the air bushings is an essential feature for measuring resonance decay rates in very lightly damped structures.

The unit employs a permanent magnet and is configured such that the armature coil remains in a uniform magnetic field over the entire stroke range. This feature, along with the air bearings, assures a high degree of force linearity and absence of armature guidance induced noise and distortion. Drive power for the shaker is obtained from a low frequency power amplifier, such as the PA 500 DM power amplifier. Modes of operation requiring high bearing loads (table mode and APS 0112 - reaction mass mode), permissible with the standard linear ball bushing version, are not permitted with the APS  113-AB shaker. Since the suspension system need not support the armature and test load weight when used in the horizontal mode, a soft suspension may be used, minimizing non-linearity effects. The maximum overhung load that may be used is 1.5 kg (3 lbs) concentrated at the mounting point. The shaker may be used with various optional accessory items to extend the areas of application:

• APS 0108 - CARRYING HANDLES AND TIE-DOWN BARS improve the portability feature of the shaker.
• APS 0109 - ZERO POSITION CONTROLLER - automatically controls the zero position of a shaker irrespective of its load.
• APS 0162 - VERTICAL MOUNTING KIT - permits vertical orientation of the shaker, either free-standing or rigid bench attachment