1、AMSC N/A FSC 5965 DETAIL SPECIFICATION LOUDSPEAKER, PERMANENT MAGNET, BLASTPROOF AND SUBMERSIBLE, NAVY TYPE 49546( ) This specification is approved for use by all Departments and Agencies of the Department of Defense. 1. SCOPE 1.1 This specification covers a blast proof, submersible loudspeaker unit
2、 capable of reproducing audio signals, when operated in conjunction with Naval communications receiving sets and associated audio frequency amplifiers. 2. APPLICABLE DOCUMENTS 2.1 General. The documents listed in this section are specified in sections 3, 4, or 5 of this specification. This section d
3、oes not include documents cited in other sections of this specification or recommended for additional information or as examples. While every effort has been made to ensure the completeness of this list, document users are cautioned that they must meet all specified requirements of documents cited i
4、n sections 3, 4, or 5 of this specification, whether or not they are listed. 2.2 Government documents. 2.2.1 Specifications, standards, and handbooks. The following specifications, standards, and handbooks form a part of this document to the extent specified herein. Unless otherwise specified, the i
5、ssues of these documents are those cited in the solicitation or contract. FEDERAL STANDARD FED-STD-H28 - Screw-Thread Standards for Federal Services. DEPARTMENT OF DEFENSE SPECIFICATIONS MIL-S-901 - Shock Tests, H.I. (High-Impact) Shipboard Machinery, Equipment, and Systems, Requirements for MIL-DTL
6、-15090 - Enamel, Equipment, Light-Gray (Navy Formula No. 111) Comments, suggestions, or questions on this document should be addressed to: Defense Supply Center, Columbus, Attn: VAI, P.O. Box 3990, Columbus, Ohio, 43218-3990 or emailed to sounddscc.dla.mil. Since contact information can change, you
7、may want to verify the currency of this address information using the ASSIST Online database at https:/assist.daps.dla.mil. Inactive for new design after 26 August 1999. INCH-POUND MIL-DTL-16225C 4 May 2010 SUPERSEDING MIL-L-16225B(SHIPS) 12 January 1961 Provided by IHSNot for ResaleNo reproduction
8、or networking permitted without license from IHS-,-,-MIL-DTL-16225C 2 DOD-P-15328 - Primer (Wash), Pretreatment (Formula No. 117 for Metals) (Metric). MIL-DTL-21981 - Electronics Equipment, Nomenclature, Serial Numbers and Identification Plates: Requirements for. MIL-DTL-24643/23 - Cable, Electrical
9、, -20 Degrees C to +105 Degrees C, 300 Volts, Type LSTTSU. DEPARTMENT OF DEFENSE STANDARDS MIL-STD-108 - Definitions of and Basic Requirements for Enclosures for Electric and Electronic Equipment. MIL-STD-167-1 - Mechanical Vibrations of Shipboard Equipment (Type I - Environmental). MIL-STD-202 - El
10、ectronic and Electrical Component Parts. (Copies of these documents are available online at https:/assist.daps.dla.mil/quicksearch/ or from the Standardization Document Order Desk, 700 Robbins Avenue, Building 4D, Philadelphia, PA 19111-5094.) 2.2.2 Other Government documents, drawings, and publicat
11、ions. The following other Government documents, drawings, and publications form a part of this document to the extent specified herein. Unless otherwise specified, the issues of these documents are those cited in the solicitation or contract. DRAWING BUREAU OF SHIPS, CAGE 80064 RE-C-49041 - Loudspea
12、ker, Navy Type 49546. (Copies of this document required by contractors in connection with specific acquisition functions may be obtained from the procuring activity at DSCC.cddwgsdla.mil, or as directed by the contracting officer.) 2.3 Non-Government publications. The following documents from a part
13、 of this document to the extent specified herein. Unless otherwise specified, the issues of these documents are those cited in the solicitation or contract. INTERNATIONAL ORGANIZATION FOR STANDARDIZATION (ISO) ISO 10012 - Measurement Management Systems Requirements for Measurement Processes and Meas
14、uring Equipment (Copies of these documents are available online at http:/www.iso.ch or from the International Organization for Standardization American National Standards Institute, 11 West 42ndStreet, 13thFloor, New York, NY 10036.) IPC - ASSOCIATION CONNECTING ELECTRONICS INDUSTRIES J-STD-004 - Re
15、quirements for Soldering Fluxes J-STD-005 - Requirements for Soldering Pastes-Replaces QQ-S-571: 1994; Amendment 1 - June 1996 J-STD-006 - Requirements for Electronic Grade Solder Alloys and Fluxed and Non-Fluxed Solid Solders for Electronic Soldering Applications (Copies of these documents are avai
16、lable online at http:/www.ipc.org or from the IPC - Association Connecting Electronics Industries, 3000 Lakeside Drive, Suite 309 S, Bannockburn, IL 60015-1249.) Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-16225C 3 NATIONAL CONFERENCE OF
17、STANDARDS LABORATORIES (NCLS) NCSL Z540.3 - Requirements for the Calibration of Measuring and Test Equipment (Copies of these documents are available from http:/www.ncsli.org or to National Conference of Standards Laboratories (NCSL), 2995 Wilderness Place, Suite 107, Boulder, CO 80301-5404.) 2.4 Or
18、der of precedence. Unless otherwise noted herein or the contract, in the event of a conflict between the text of this document and the references cited herein, the text of this specification takes precedence. Nothing in this specification, however, supersedes applicable laws and regulations unless a
19、 specific exemption has been obtained. 3. REQUIREMENTS 3.1 First article. When specified (see 6.2), a sample shall be subjected to first article inspection in accordance with 4.2. 3.1.1 First article sample. Two (2) first article samples shall be furnished for the tests. 3.2 Material and parts. Mate
20、rial and parts shall be as specified on U. S. Navy Drawing RE-C-49041. Material and parts not specified shall be capable of withstanding the tests specified herein. 3.3 Salt spray. The loudspeaker shall withstand the test specified in 4.4.7. Following the test, there shall be no evidence of corrosio
21、n, electrical damage, or mechanical damage. 3.4 Application. The loudspeaker shall be suitable for open bridge and other exterior installations and operation on Naval combatant ships of all types. This requirement stipulates that the loudspeaker shall be capable of operating under conditions of shoc
22、k, vibration, roll and pitch, gunblast, and wide ranges of ambient temperature and humidity incidental to such installations and use. 3.5 Design. The loudspeaker unit specified herein shall be of the radial, reflex horn type. 3.5.1 Major parts. The loudspeaker unit shall include the following major
23、parts. a. Magnetic, blastproof driver unit complete with diaphragm-voice coil assembly. b. Hermetically sealed matching input transformer. c. Volume control. 3.5.2 Recycled, recovered, or environmentally preferable materials. Recycled, recovered, or environmentally preferable materials should be use
24、d to the maximum extent possible, provided that the material meets or exceeds the operational and maintenance requirements, and promotes economically advantageous life cycle costs. 3.6 Electrical requirements (see 4.4.3). 3.6.1 Frequency range. The loudspeaker shall be capable of reproducing, articu
25、lately and audibly, frequencies within the range of 200 to 5,000 Hertz (Hz). There shall be no serious resonance peaks of such amplitude as to materially affect the quality of response over the operating range or to cause rattling. The frequency response shall be within the limits shown on figure 1,
26、 when tested with a decibel meter at an angle of 90 degrees off the sound axis (see figure 2). 3.6.2 Power handling capacity. The loudspeaker shall be capable of handling input power up to 10 watts. It shall also be capable of continuous operation at the specified maximum input level without produci
27、ng rattles or causing deleterious effects to the windings of the voice coil or to any other parts of the loudspeaker. The maximum input level shall be considered to be 10 watts at 1,000 Hz. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-1622
28、5C 4 3.6.3 Input impedance. A transformer, capable of handling 10 watts, shall be included in each unit, which shall provide for changing the input impedance from 600 ohms to 1,200, 1,800, 2,400, or 3,000 ohms when the impedance is measured at 1,000 Hz. A tolerance of 10 percent will be permitted on
29、 these impedance values. 3.6.4 Acoustical efficiency. The acoustical efficiency of the loudspeaker shall be such that, with an input of 1.00 watt to the voice coil with the frequency varied between 950 and 1,300 Hz, the acoustical pressure shall average at least 1 Pascal (Pa) along the sound axis, a
30、t least 0.9 Pa at 10 degrees off the axis, and at least 0.7 Pa at 25 degrees off the axis. These values shall be based upon pressure measurements on the sound axis made at a distance of 6 feet from the mouth of the loudspeaker and off-axis measurements made at four equally spaced points around the p
31、eriphery of a circle whose plane is normal to the sound axis with the points of measurements 6 feet from the center of the loudspeaker mouth (see figure 2). 3.6.5 Volume control. The loudspeaker shall be provided with a volume control having the following characteristics: 3.6.5.1 Minimum attenuation
32、. Minimum attenuation shall occur in the full clockwise position of the control. 3.6.5.2 Maximum attenuation. Maximum attenuation shall occur in the full counter-clockwise position of the control and shall be at least 30 decibels (dB) below the audio output at the minimum attenuation position of the
33、 control, for all audio frequencies. 3.6.5.3 Attenuation and shaft rotation. The attenuation with respect to shaft rotation shall be linear within 6 dB over approximately three-quarters of the range. The attenuation shall be spread over not less than 75 percent of the angular rotation of the control
34、. 3.6.6 Distortion. Distortion shall not exceed 10 percent r.m.s., when measured at the frequencies specified in 4.4.4. 3.6.7 Acoustical quality. The loudspeaker shall withstand the acoustical quality test specified in 4.4.5. During this test, there shall be no buzzing, rattling, or other spurious s
35、ounds in the acoustic output of the loudspeaker, which will degrade the quality of reproduced speech. 3.6.8 Insulation resistance. Insulation resistance shall be not less than 100 megohms, when measured with a 500-volt source as specified in 4.4.6. 3.7 Mechanical details and construction. 3.7.1 Dime
36、nsions. The dimensions and external physical characteristics of the loudspeaker shall be in accordance with Drawing RE-C-49041. 3.7.2 Weight. The weight of the loudspeaker unit, including transformer and volume control, shall not exceed 10.5 pounds. 3.7.3 Mounting. The loudspeaker shall be designed
37、for mounting to any vertical surface, such as bulkheads, or to the overhead by the addition of a right angle bracket. It is not required that the contractor provide the right angle bracket. 3.7.4 Terminal tube entrance. A cable clamp shall be provided on the interior of the mounting base to support
38、all incoming audio lines. The entrance for the terminal tube shall be enclosed and protected against the entrance of moisture, and shall be so constructed as to permit ready access to the terminals for the connection of the leads. Entering tube and cable will be Government-furnished. Provided by IHS
39、Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-16225C 5 3.7.5 Volume control adjustment. The volume control shall be recessed so that the shaft shall be flush with the enclosure surfaces. Provision shall be made for screwdriver adjustment of the volume con
40、trol through an opening in the loudspeaker housing. The volume control opening shall be so constructed as to maintain the watertight security of the complete loudspeaker unit. 3.7.6 Finish. The loudspeaker shall be thoroughly cleaned and covered with a protective coating in accordance with DOD-P-153
41、28. This shall be followed by two coats of high quality semi-gloss alkyd enamel. The color shall be light gray, and shall match the standard chip of formula III in accordance with MIL-DTL-15090. 3.7.7 Terminals. All terminals necessary for connecting the audio source to the attenuator pad shall be p
42、rovided on the matching transformer. The transformer terminals shall be suitable for connecting type M24643/23-01UN, LSTTSU-1 inch cable conductors in accordance with MIL-DTL-24643/23. All screws employed as parts of terminals for securing cable leads or other similar applications shall be of the ca
43、ptive type. Staking or upsetting the ends of the threaded shanks of such screws shall be considered as meeting these requirements. 3.7.8 Threaded parts. All threaded parts shall be in accordance with FED-STD-H28, and shall have the specified fit after plating or other coatings (see 3.2). 3.7.9 Solde
44、r. Solder shall be solid or rosin flux cored in accordance with composition Sn97Pb3 of J-STD-004, J-STD-005, and J-STD-006. 3.7.9.1 Pure tin. The use of pure tin, as an underplate or final finish, is prohibited both internally and externally. Tin content of loudspeaker components and solder shall no
45、t exceed 97 percent, by mass. Tin shall be alloyed with a minimum of 3 percent lead, by mass (see 6.3). Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-16225C 6 FIGURE 1. Limits for loudspeaker frequency response. Provided by IHSNot for Resal
46、eNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-16225C 7 FIGURE 2. Orientation in acoustical tests. 3.8 Operating conditions. The loudspeaker unit shall be designed for intermittent or continuous operation, without damage, under the adverse conditions normally encounter
47、ed in installations exposed to the weather aboard naval combatant ships, and shall be capable of normal operation after prolonged periods of storage and transportation from one location to another. Such operation shall be predicated on satisfactory performance, within the limits permitted herein and
48、 under the following specified conditions. 3.8.1 Submergence. There shall be no degradation of the acoustical characteristics after the loudspeaker has been subjected to the submergence tests of 4.4.8. 3.8.2 Temperature cycling. The loudspeaker shall not be damaged nor the operational performance de
49、graded, when restored to the operating temperature range after being exposed for long periods in the non-operating temperature range of 62 degrees C to + 70 degrees C. (see 4.4.10). 3.8.3 Shock and vibration. The loudspeaker shall be designed to withstand the mechanical shocks and vibrations normally encountered aboard ship. The loudspeaker shall successfully withstand the tests of 4.4.9. 3.8.4 Service
