Amityville NY – U.S. Dynamics Corporation (USD) has announced the availability of the model 475 Series subminiature Rate Gyroscopes. The model 475 series provides a low cost, high performance Rate Gyroscope designed to operate under severe operating conditions and is ideally suited for ground-based, shipboard and airborne applications. The 475 gyro is an all-welded, hermetic construction, capable of meeting performance requirements in extreme operating environments of vibration, shock, altitude, humidity and temperature. The heart of the gyro consists of a synchronous hysteresis motor whose high reliability is enhanced by preloaded inertial grade ball bearings and advanced lubricants. The spin motor assembly is dynamically balanced using state-of-the-art high precision balancing equipment and then run-in for a minimum of 96 hours to fully channel the lubricants. The gimbal is supported by a specially designed torsion wire that yields very low hysteresis with excellent repeatability and a miniature high precision ball bearing enabling high g forces without distortion. The angular position of the gimbal is detected by a variable reluctance pickoff which contains quadrature and null trimming capabilities. Utilizing state of the art materials for the stator and rotor stacks, it provides high sensitivity, excellent linearity and low noise. A stable and inert silicone-based fluid is used for gimbal neutral buoyancy and damping. It's characteristics allow gyro start-up at low temperatures of –54 deg C. Dynamic characteristics of the gyro are maintained throughout the temperature range by means of a bellows-operated, variable-orifice, damping compensator. The compensator is a mechanical device and requires no power source. An external null trimming device enables mechanical trimming of the pickoff without electrical components that would effect pickoff phase shift. All gyros are temperature cycled from -65 deg F to +240 deg F for 48 hours to stress relieve all components and assure maximum drift stability.
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