scope:

Foreword

This Specification Format has been prepared as a guide for the preparation of a single-degree-of-freedom springrestrained rate gyro specification. Prepared by the Gyro and Accelerometer Panel of the Aerospace Electronic Systems Group of the Institute of Electrical and Electronics Engineers, this format provides a common meeting ground of terminology and practice for manufacturers and users.

Two other documents, Aerospace Industries Association EETC Report No. 5 (Revision A), "Standard Gyro Terminology,"* and IEEE Standards Publication No. 293, "Test Procedure for Single-Degree-of-Freedom Spring- Restrained Rate Gyros," have been utilized in the preparation of this format. This format will be limited to conventional single-degree-of-freedom spring-restrained rate gyros. A model equation is given in paragraph 6.3 for reference, and is to be included in a specification only to the extent necessary.

Table 1, on this page, lists various rate gyro design features for which this format is applicable. The table is not intended to make any suggestion regarding the selection of particular design features that might restrict the free choice of manufacturers.

Blank spaces are provided in the Specification Format for the insertion of specific values. Brackets are used to designate possible alternates. Boxed information is intended for explanatory purposes. Figures 1, 2, and 3 are to be used as a guide for the preparation of specific figures or drawings.

The user is cautioned not to overspecify. Only those parameters that are required to guarantee proper instrument performance in the intended usage should be controlled.

* Available from: National Standards Association, Inc.

1321 Fourteenth Street N.W.

Washington. D.C. 20005

Table 1-Rate Gyro Design Features

Pickoff Spin Motor Damping Regulation Self-Test Torquer Rotor Rotation Detector

1. Variable reluctance (microsyn) 1. Ac synchronous hysteresis (3- phase, 2-phase) 1. Selfcompensating 1. Variable reluctance 1. Pulse

2. Potentiometer 2. Ac induction (squirrel cage rotor) (3-phase, 2-phase) 2. Controlled temperature (heater controlled) 2. Dc permanent magnet 2. Near sinusoidal

3. Switch 3. Dc (with governor) 3. Uncompensated

4. Other (optical, capacitance)

NOTE - The intent of this table is to indicate configurations of a spring-restrained rate gyro for which this specification format is applicable. The features may be employed in any combination.

Scope

This specification defines the requirements for a single-degree-of-freedom spring-restrained rate gyro for [aircraft, missile, spacecraft,______] applications. The rate gyro shall be capable of providing [(dc, ac) voltage outputs proportional to angular rate inputs up to______ degrees per second, a switch closure(s) at angular rates (exceeding, less than)______ (+, - , ± )______ degrees per second].