scope:

This specification covers fiber optic tachometers capable of measuring rotational speed for use in Navy shipboard applications.

The sensor classification shall consist of a series of designations which shall be assigned and listed in the format below.

24797 - X - X - X - X Specification Sensing Input Opto-Electronics Sensor Mechanism Power Module Type Mounting 1.2.1.1 1.2.1.2 1.2.1.3 Configuration 1.2.1.4

The sensing mechanism of transduction shall be designated as follows:

1 - Reflection

2 - Beam interruption

3 - Magneto-optic effect

The input power required to operate the opto-electronics module shall be designated as follows:

DC - 28 Volts direct current (Vdc)

AC - 115 Volts alternating current (Vac) Beneficial comments (recommendations, additions, deletions) and any pertinent data which may be of use in improving this document should be addressed to: Commander, Naval Sea Systems Command, SEA 03R42, 2431 Jefferson Davis Hwy., Arlington, VA 22242-5160, by using the Standardization Document Improvement Proposal (DD Form 1426) appearing at the end of this document or by letter.

The mounting of the tachometer's opto-electronics module type shall be designated as follows:

Type A - Bulkhead Mounted (See 3.4.2.1)

Type B - Console Mounted (See 3.4.2.2)

The mounting of the tachometer's sensor shall be designated as follows:

Mount 1 (See 3.4.14.1)

intended Use: