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MIL-M-23167B(SHIPS)
29 December 1969 SUPERSEDING
MIL-M-23167A(SHIPS)
10 April 1967 (See 6.7)
MILITARY SPECIFICATION
METER, FREQUENCY, EXPANDED SCALE SWITCHBOARD TYPE (NAVAL SHIPBOARD USE)
1. SCOPE
1.1 Scope. This specification covers high accuracy, shockproof switchboard mounted, expanded scale frequency meters for Naval shipboard use.
1.2 Classification.
# 1.2.1 Type designation. The type designation of frequency meters shall be in the following form and as specified (see table IV and 6.2):
_MR_ |
_49_ |
_W_ |
_41_ |
_AF_ |
_H_ |
|||||
Component |
Style |
Color |
Center scale value |
Kind of current |
Special |
|||||
(1.2.1.1) |
(1.2.1.2) |
scheme (1.2.1.3) |
and voltage rating (1.2.1.4) |
1.2.1.5) |
feature (1.2.1.6) |
1.2.1.1 Component. Frequency meters covered by this specification shall be designated by the two letter symbol "MR".
1.2.1.2 Style. The style shall be designated by a two digit number which signifies the characteristics specified in 1.2.1.2.1 and 1.2.1.2.2.
1.2.1.2.1 First digit. The first digit shall designate the normal size and shape of flange as follows:
3 - 3-1/2 inch round flange, sealed.
4 - 4-1/2 inch rectangular flange.
1.2.1.2.2 Second digit. The second digit shall designate the type mounting and the normal scale length in angular degrees as follows:
8 - Flush mounting, 90 degree nominal scale.
9 - Flush mounting, 250 degree nominal scale.
1.2.1.3 Color scheme. The color scheme of the dial background, markings, and pointer shall be des- ignated by a single letter as follows:
W - White dial background, black markings and black pointer.
1.2.1.4 Center scale value and nominal voltage rating. The center scale value and nominal voltage rating shall be designated by two digit numbers as specified in 1.2.1.4.1 and 1.2.1.4.2.
# 1.2.1.4.1 First digit. The first digit shall designate the center-scale value as follows:
4 - 400 Hertz: (Hz) scale range 395-405 Hz
1.2.1.4.2 Second digit. The second digit shall designate the nominal voltage rating as follows:
1 - 120 volts.
2 - 450 volts.
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