1.B.6.Vibration test systems, equipment, and components as follows:

a. Electrodynamic vibration test systems, having all of the following characteristics:
1. Employing feedback or closed loop control techniques and incorporating a digital control unit;
2. Capable of vibrating at 10 g₀ root mean square (RMS) or more between 20 and 2000 Hz; and
3. Capable of imparting forces of 50 kN or greater measured ‘bare table’;
b. Digital control units, combined with “software” specially designed for vibration testing, with a real-time bandwidth greater than 5 kHz and being designed for a system specified in Item 1.B.6.a.;
c. Vibration thrusters (shaker units), with or without associated amplifiers, capable of imparting a force of 50 kN or greater measured ‘bare table’, which are usable for the systems specified in Item 1.B.6.a.;
d. Test piece support structures and electronic units designed to combine multiple shaker units into a complete shaker system capable of providing an effective combined force of 50 kN or greater, measured ‘bare table’, which are usable for the systems specified in Item 1.B.6.a.
Technical Note: In Item 1.B.6. ‘bare table’ means a flat table, or surface, with no fixtures or fittings.