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MIL-T-24797 1995 Edition, June 22, 1995
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TACHOMETERS, FIBER OPTIC, (NAVAL SHIPBOARD USE), (METRIC), GENERAL SPECIFICATION FOR
Includes all amendments and changes through Notice 3, August 9, 2002
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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)