scope:

This specification covers switchboard-mounted synchroscopes which indicate phase angle between two alternating current (a.c.) power sources or show within limits their relative departure from synchronism.

The type designation of synchroscopes shall be in the following form, as specified (see 6.2.1).

MR 4R W 060 SY H Component Style Color Frequency Unit Special scheme response features 1.2.1 1.2.2 1.2.3 1.2.4 1.2.5 1.2.6

Synchroscopes covered by this specification are designated by the two-letter symbol "MR".

The style is designated by a two-digit number which signifies the size and shape as follows: (See figures 1 and 2. Rounded-flanged synchroscopes shall be in accordance with the applicable plates of ANSI C39.1.)

4: 4-½ inch synchroscope

6: 6 inch synchroscope 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 55Z3, Department of the Navy, Washington, DC 20362 by using the self-addressed Standardization Document Improvement Proposal (DD Form 1426) appearing at the end of this document or by letter.

R: Round flange

S: Rectangular flange

B: Black dial, white pointer and lettering

W: White dial, black pointer and lettering

The frequency response shall be designated by a three digit number in hertz (Hz), zero-filled to the left.

The unit shall be "SY" for synchroscope.

(When applicable.)

H: High-impact (H.I.) shock

intended Use: