1、AMSC N/A FSC 5965 PERFORMANCE SPECIFICATION HEADSET-MICROPHONE, (HEARING PROTECTIVE TYPE, HIGH AND MODERATE AMBIENT NOISE LEVELS), GENERAL SPECIFICATION FOR This specification is approved for use by all Departments and Agencies of the Department of Defense. 1. SCOPE 1.1 Scope. This specification cov
2、ers the requirements for headset-microphone with rigid headband. These parts meet established requirements for communications equipment used to protect against hazardous noise exposure and are approved for use in certain high and moderate ambient noise level applications (see 6.1). The term headset
3、is to be used interchangeably for headset-microphone and is used when referring to any of the articles covered in this specification. 1.2 Classification. 1.2.1 Part or Identifying Number (PIN) (see 3.6). The term PIN is equivalent to the term (part number, identification number, and type designator)
4、, which was previously used in this specification. The products specified herein (see 3.1) are identified by military PINs, which consist of the basic specification number, slash number of the specification sheet, and a sequentially assigned number as shown in the following example. M 87819 /XX -01
5、Sequentially assigned number Specification sheet number Basic specification M prefix 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 does not include documents cited in other sections of this specifica
6、tion 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 in sections 3, 4, or 5 of this specification, whether or not they ar
7、e listed. INCH-POUND MIL-PRF-87819B 30 September 2009 SUPERSEDING MIL-PRF-87819A(USAF) 30 January 1997 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. S
8、ince contact information can change, you may want to verify the currency of this address information using the ASSIST Online database at http:/assist.daps.dla.mil. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-87819B 2 2.2 Government docume
9、nts. 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 issues of these documents are those cited in the solicitation or contract. DEPARTMENT OF DEFENSE SP
10、ECIFICATIONS MIL-DTL-55668 - Cord, Electrical, Audio, Subminiature (Retractile And Straight). MIL-DTL-9177/2 - Connector, Audio, Airborne, Plug, Miniature, 4 Contact. MIL-PRF-87819/1 - Headset-Microphone, Hearing Protective Type High Ambient Noise Levels, 105-125 dB, M87819/1-01. MIL-PRF-87819/4 - H
11、eadset-Microphone, Hearing Protective Type Moderate Ambient Noise Levels, 105 dB, In-flight Aircrew Headset-Microphone, M87819/4-01. MIL-PRF-87819/5 - Headset-Microphone, Hearing Protective Type Moderate Ambient Noise Levels, 105 dB, Enlarged Earcup, In-flight Aircrew Headset-Microphone, M87819/5-01
12、. MIL-PRF-87819/6 - Headset-Microphone, Hearing Protective Type Moderate Ambient Noise Levels, 105 dB, Enlarged Earcup, In-flight Aircrew Headset-Microphone, M87819/6-01 DEPARTMENT OF DEFENSE STANDARDS MIL-STD-202 - Test Methods for Electronic and Electrical Component Parts. MIL-STD-810 - Environmen
13、tal Test Methods and Engineering Guidelines. MIL-STD-1285 - Marking of Electrical and Electronic Parts. (Copies of these documents are available online at http:/assist.daps.dla.mil/quicksearch/ or from the Standardization Document Order Desk, 700 Robbins Avenue, Building 4D, Philadelphia, PA 19111-5
14、094.) 2.2.2 Other Government documents, drawings, and publications. 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 contr
15、act. DRAWINGS U.S. Air Force (CAGE 97151) 57B12662 - Plug connector, Electrical U-173/U, Assembly of 9312801 - Earphone Cushion - Headset. (Copies of these documents are available online at http:/www.dscc.dla.mil/programs/milspec/ or from the Defense Supply Center Columbus, ATTN: VAI, P.O. Box 3990,
16、 Columbus, Ohio 43218-3990.) 2.3 Non-Government publications. The following documents from 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. AMERICAN NATIONAL STANDARDS INSTITUTE (ANSI) A
17、NSI S3.2 - Method for the Measurement the Intelligibility of Speech over Communication Systems. ANSI S3.7 - Method for Coupler Calibration of Earphones. ANSI S12.42 - Microphone-In-Real-Ear and Acoustic Testing Methods for the measurement of Insertion Loss of Circumaural Hearing Protection Devices.
18、Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-87819B 3 (Copies of these documents are available online at http:/www.ansi.org or from the American National Standard Institute, 25 West 43 Street, 4thFloor, New York, NY 10036.) ASTM INTERNATIO
19、NAL ASTM D454 - Test Method for Rubber Deterioration by Heat and Air Pressure. ASTM D470 - Standard Test Methods for Crosslinked Insulations and Jackets for Wire and Cable. ASTM D572 - Test Method for Rubber-Deterioration by Heat and Oxygen. ASTM D573 - Test Method for Rubber Deterioration in an Air
20、 Oven. ASTM D866 - Standard Specification for Crosslinked Styrene-Butadiene (SBR) Synthetic Rubber Jacket for Wire and Cable. ASTM D3574 - Standard Test Methods for Flexible Cellular Materials Slab, Bonded, and Molded Urethane Foams. (Copies of these documents are available online at http:/www.astm.
21、org or from the ASTM International, P.O. Box C700, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959.) INTERNATIONAL ORGANIZATION FOR STANDARDIZATION (ISO) ISO -17025 - General requirements for the competence of testing and calibration laboratories (Copies of these documents are available onli
22、ne at http:/www.iso.ch or from the International Organization for Standardization American National Standards Institute, 11 West 42ndStreet, 13thFloor, New York, NY 10036.) NCSL INTERNATIONAL NCSL Z540.3 - Requirements for the Calibration of Measuring and Test Equipment (Copies of these documents ar
23、e available online at http:/www.ncsli.org or from NCSL International 2995 Wilderness Place, Suite 107 Boulder, Colorado 80301-5404) 2.4 Order 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 (ex
24、cept for related specification sheets), the text of this specification takes precedence. Nothing in this specification, however, supersedes applicable laws and regulations, unless a specific exemption has been obtained. 3. REQUIREMENTS 3.1 Specification sheets. The individual item requirements shall
25、 be as specified herein and in accordance with the applicable specification sheet. In the event of any conflict between requirements of this specification and the specification sheet, the latter shall govern. 3.2 Qualification. Headsets furnished under this specification shall be products that are a
26、uthorized by the qualifying activity for listing on the applicable qualified products list before contract award (see 4.4 and 6.3). 3.3 Materials. Materials shall be as specified herein. However, when a definite material is not specified, a material shall be used, which will enable the product to me
27、et the performance requirements of this specification. Acceptance or approval of any constituent material shall not be construed as a guaranty of the acceptance of the finished product. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-87819B 4
28、 3.3.1 Pure tin. The use of pure tin, as an under plate or final finish, is prohibited both internally and externally. Tin content of headset and solder shall not exceed 97 percent, by mass. Tin shall be alloyed with a minimum of 3 percent lead, by mass (see 6.7). 3.4 Interface requirements. 3.4.1 E
29、arphone elements. Earphone elements shall be as specified (see 3.1). 3.4.1.1 Earphone element mounting. The element shall be firmly mounted in the earcup. The mounting mechanism shall hold the earphone element in the center of the earcup, facing and directly parallel to the ear opening without shift
30、ing under specified conditions. It shall be reusable after repair and allow easy replacement of the earphone element by skill level 3 repair technicians. The earphone surface shall not protrude more than 0.75 inch from the uncompressed face of the ear cushion. 3.4.2 Microphone elements. Microphone e
31、lements shall be as specified (see 3.1). 3.4.2.1 Microphone boom assembly. The microphone boom assembly shall be as specified (see 3.1). 3.4.2.1.1 Boom interface to earcup. When specified (see 3.1), the boom shall be attached to the left earcup using a fingers-adjustable screw-and-nut assembly. The
32、assembly shall be grooved to allow the wire boom to seat securely when tightened. The boom nut assembly shall completely prevent the boom from slipping from its tightened position during use. 3.4.2.2 Microphone protective shield. The microphone protective shield shall be as specified (see 3.1). 3.4.
33、3 Cable and cord assemblies. The cable and cord assemblies shall conform to the requirements of MIL-DTL-55668, for consistency with established repair procedures regarding conductor color-coding. Other electrically-compatible audio-communications cord may be supplied, given that it has equivalent or
34、 superior performance with respect to extremes of temperature, ozone-resistance, flame-retardant, tensile-strength, retractability, and extension range, when approved by the qualifying activity. Terminations of the 4-conductor cord at (1) the entry to the earcup and (2) the PIN U-174/U connector sha
35、ll include a mechanism to resist slippage of the cable conductors from the associated connector due to twist and pull during normal use, when tested as specified in 4.7.12. a. Two-conductor cords shall be shielded overall, for electrical-isolation, and have a jacket diameter of .140 .015 inch, for i
36、nterface to connectors, and for adherence to the flex-life requirements of this specification. b. The jacket compound and insulation materials shall be in accordance with ASTM D866 and ASTM D470, or shall be material having equivalent or superior performance with respect to ozone-resistance, flame-r
37、etardant, deterioration by heat and air pressure aging (see ASTM D454), heat and oxygen (see ASTM D572), and air oven (see ASTM D573), as specified. c. The 4-conductor (console) cord shall be integrated with the 2-conductor (earcup-to-earcup) cord in a manner which allows replacement of either secti
38、on individually during repair (see 3.5.18), while also meeting the attenuation and twist-pull requirements of this specification. 3.4.4 Headset-microphone. The configuration for products covered by this specification shall be as specified (see 3.1). 3.4.5 Finish. The finish shall be a nonreflective,
39、 lusterless, dark color having low contrast with colors in operational clothing and gear, such as black, grey, dark blue, or green. The finish shall be uniform in color. The use of any protective coating that will crack, chip, or scale with age, normal use, or extremes of atmospheric conditions shal
40、l be avoided. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-87819B 5 3.4.6 Rigid materials. The materials used shall be of sufficient durability and hardness to provide the required strength and rigidity with maximum strength to weight rati
41、o. Any metals shall be of a corrosion resistant type. 3.4.7 Earcup shells. The earcup shall conform to the overall dimensional envelope on figure 1, in order to avoid obstructions to the emergency oxygen mask harness. The earcup shell material shall resist breakages at the yoke attachment, at the se
42、ams (if any), and at points where cable and volume control holes have been drilled, when tested in accordance with 4.7.6. Treatments used to process the device shall not cause skin irritation. 3.4.8 Earcup fillers. If the earcup is supplied with a filler material, it shall be flame retardant, and me
43、et the environmental requirements (see 3.5.5, 3.5.6, 3.5.8, 3.5.9, 3.5.10, and 3.5.15) of this specification. It shall not obstruct the auditory path of the transducer, and shall only be permanently attached to the earphone element if the manufacturer demonstrates that such attachment increases the
44、signal-to-noise ratio of the headset. Fillers shall allow clearance of at least 0.750 inch, from the uncompressed face of the earcushion, unless otherwise specified (see 3.1). 3.4.8.1 Earcup shell cushion (earcushion). The earcup shall be supplied with a cushion, meeting the human interface dimensio
45、nal requirements of Air Force drawing 9312801. It shall be replaceable without causing damage to the earcup. As specified in ASTM D3574, the cushion shall have a filler material that meets the noise-attenuation requirements of this specification and has a density that supports the comfort requiremen
46、ts of the headsets intended use, not less than 5.7 lbs/ft3. The fillers and cushion surface material shall be flame-retardant and shall not crack, tear, or otherwise degrade under the environmental conditions of this specification (see 3.5.5, 3.5.6, 3.5.8, 3.5.9, 3.5.10, 3.5.15). The color shall be
47、black. The fillers shall not leak, in the event of puncture to the cushion surface. 3.4.8.2 Microphone protective shell cushion. The microphone protective shell cushion shall be as specified, when required (see 3.1). Provided by IHSNot for ResaleNo reproduction or networking permitted without licens
48、e from IHS-,-,-MIL-PRF-87819B 6 Letter Inches mm Design dimension Tolerances Design dimension Tolerances A 4.50 Max 114.3 Max B 1.75 Max 44.45 Max C 3.60 0.031 91.44 0.7874 NOTES: 1. Envelope dimensions shall be as shown, to provide interface to the emergency oxygen mask harness. 2. All cable entry
49、or other holes in the earcup shall be strengthened to meet the environmental and shock (drop) requirements of this specification. 3. Each earcup shall be secured to its yoke in a manner which prevents inadvertent detachment, as specified in the Foreign Object Damage requirements of this specification (see 3.5.16), while allowing replacement of the earcup during repair. 4. When specified (see 3.1), the volume control knob shall
