NAVY A-A-50621-1993 LOUDSPEAKERS PERMANENT MAGNET FOR SHIPBOARD ENTERTAINMENT SYSTEMS《船娱乐系统永久磁铁扩音器》.pdf

1、 - .r A-A-50621 m 9999974 0163549 4bb m LMETRIC I A-A- 50621 23 February 1993 SUPERSEDING 16 September 1968 MIL-L-l7080C(SHIPS) COMMERCIAL ITEM DESCRIPTION LOUDSPEAKERS, PERMANENT MAGNET FOR SHIPBOARD ENTERTAINMENT SYSTEMS The General Services Administration has authorized the use of this commercial

2、 item description as a replacement for MIL-L-17080C which is canceled. Abstract. loudspeakers suitable for use on naval ships. This Commercial Item Description covers requirements for permanent magnet Salient characteristics. Loudspeakers furnished under this Commercial Item Description shall be of

3、the permanent magnet direct radiator type. The speaker enclosure, designed for bulkhead mounting, shall contain a loudspeaker unit with a cone having a nominal 203 mm diameter, a line matching transformer, a volume selector switch and-a channel selector switch. 1. Integral components. Loudspeaker as

4、semblies shall consist of the following integral components manufactured in accordance with the following specifications or as specified herein: (a) Loudspeaker. EIA-SE-103 Speakers for sound equipment EIA- 157 EIA- 276 Method for determining air gap flux density and aqy. Acceptance Testing of Dynam

5、ic Loudspeakers Beneficial comments, recommendations, additions, deletions, clarifications, etc. and any other data which may improve this document should be sent to: Commander, Naval Sea Systems Command, SEA 031242, 2531 Jefferson Davis Hwy., Arlington, VA 22242-5160. AMSC N/A FSC 5965 DISTRIBUTION

6、 STATEMENT A. Approved for public release; distribution is unlimited. Licensed by Information Handling ServicesA-A-50623 7979974 0363550 LBB ri .- * A-A-50621 (b) Volume and Channel Selector Switch (Rotary). EIA-520F000 Sectional Specification for Rotary Switches of Certified Quality (Low Current Ca

7、pacity - 2 Amperes or Less) (c) Enclosure. Bulkhead enclosures shall be as specified herein. 2. Enclosure. (a) Loudspeaker enclosure. The loudspeaker enclosure shall have three 13 mm diameter holes in the back plate for bulkhead mounting. Except for the increased depth incident to opening the hinged

8、 front cover 90 degrees and the clearance dimensions required to install, remove, or service the loudspeaker. The enclosure shall not be not greater than the following dimensions: Mounting details shall be as shown on figure 1. Width - 380 mm Height - 380 mm Depth - 230 mm 1. Enclosure openings. The

9、 enclosure shall have an opening for the loudspeaker face, This opening and any port openings required to meet the specified performance characteristics, shall be covered with metal mesh or perforated metal not less than 1 mm thick. Mesh openings or perforations shall be not larger than 2 mm. 2. Enc

10、losure construction. The enclosure shall be provided with a hinged front cover, held closed by a catches requiring no tools for operation. Opening the cover shall provide ready access to all interior components and to the enclosure mounting holes. Opening the enclosure shall not involve the disturba

11、nce of incoming cables or stuffing tubes. Component mounting fasteners shall be secured so asto not require demounting of the enclosure for component replacement. Components shall be mounted so that their terminal markings are easily visible with the enclosure door open. Damping material, if used, s

12、hall be fastened positively. 3. Cable entrance. Facilities shall be provided to admit cables through the bottom of the enclosure utilizing stuffing tubes. 2 Licensed by Information Handling ServicesA-A-50b21 m 9999934 0163551 Ob4 m A-A- 50621 I TYPE LS-443IWD-1 / I 203 TYPE LS-444/WIH AND TYPE LS-54

13、3ISIC FIGURE 1 - MOUNTING DETAILS Note: All dimensions shown are in Millimeters 3 Licensed by Information Handling ServicesA-A-50621 m 9999974 OLb3552 T50 m A-A- 50621 4. Finish. Metal surfaces shall be finished with a corrosive resistant latex or epoxy paint, in the specified color, in accordance w

14、ith best commercial practices. materials shall be finished in the color specified in the contract. Composite (b) Circuit label. A printed schematic of the loudspeaker enclosure wiring shall be permanently affixed to the inside of the enclosure where it will be easily readable with the cover open. It

15、 shall show wire color coding, terminal designations and selector switch connections and functions. 3. Reliabilitv. Speaker enclosures shall have a MTBF of 25,000 hours 4. Tvpes of loudspeakers. Loudspeakers shall be of the following types: (a) Loudspeaker - LS-443/WIH (b) Loudspeaker - LS-444/WIH (

16、c) Loudspeaker - LS-543()/SIC 5. Loudspeaker input. Loudspeakers built to this specification shall accept an input from a 70.7-volt line. 6. Switches. (a) Channel selector. The channel selector shall be a 5-position switch. It shall be so connected that it will switch its two output leads to any one

17、 of 4 separate inputs. The unconnected switch position shall be at the counter clockwise (CCW) end of the rotation and shall be marked “OFF“. channel selector shall be fed to the volume selector. The output of the (b) Volume selector. The volume selector switch shall be a 6- position switch. It shal

18、l connect one lead from the channel selector to various taps of the line-to-voice coil transformer, with volume increasing in the clockwise (CW) direction. The other lead from the channel selector shall be permanently connected to the other side of the transformer. 7. Multiple speaker operation. To

19、provide for multiple speaker opera- tion, the two input leads to the volume selector switch shall be made available on a terminal strip. a. Shock. The loudspeakers built to this specification shall meet the shock requirements of MIL-S-901 for Lightweight, Grade B, Class I, Type A, Hull mounted equip

20、ment. 9. Strav magnetic - field. The maximum value of stray magnetic field measured on a horizontal plane 76 cm below the axis of the loud- speaker magnet shall not exceed 1.05 milligaus (105 gamma). magnetic field limit shall apply only to LS-543()/SIC loudspeakers. The stray 4 Licensed by Informat

21、ion Handling Services. L A-A-50b2L 7999e17Y 0363553 997 A-A- 50621 Contractor certification. tiating evidence that the product offered meets the salient characteristics of this Commercial Item Description and that the product conforms to the producers own drawings, specifications, standards and qual

22、ity assurance practices. The government reserves the right to require proof of such conformance prior to the first delivery and thereafter as may be otherwise provided for under the provisions of the contract. The contractor shall certify and maintain substan- O Renulatorv - requirements. The offere

23、r/contractor is encouraged to use recovered materials in accordance with Public Law 94-580 to the maximum extent practical. Preservation. packaging. packing. labeling. and markinq. The preservation, packaging, packing, labeling, and marking shall be as specified in the contract or order. Notes. 1. O

24、rdering data. a. Title, number, and date of this Commercial Item Description. b. Type of loudspeaker required. c. Color desired MILITARY INTERESTS : Custodians Army - ER Navy - SH Air Force - 99 CIVIL AGENCY COORDINATING ACTIVITIES: COMMERCE - NIST GSA-FSS PREPARING ACTIVITY: NAVY - SH (PROJECT 5965-0228) Reviewing activity Navy - AS User activity DU - GS 5 Licensed by Information Handling Services