DLA A-A-50796 A-2011 SIREN ELECTRONIC.pdf

1、Beneficial comments, recommendations, additions, deletions, clarifications, etc. and any data that may improve this document should be sent to: STDZNMGTdla.mil or DLA Aviation VEB, 8000 Jefferson Davis Highway, Richmond, VA 23297-5616. Since contact information can change, you may want to verify the

2、 currency of this address information using the ASSIST database at https:/assist.daps.dla.mil/. FSC 6350 INCH-POUND A-A-50796A 12 December 2011 SUPERSEDING A-A-50796 5 May 1982 COMMERCIAL ITEM DESCRIPTION SIREN, ELECTRONIC The General Services Administration has authorized the use of this commercial

3、 item description for all federal agencies. 1. SCOPE. This commercial item description (CID) covers electronic sirens for use on law enforcement and emergency response vehicles. 2. CLASSIFICATION. The siren shall be classified by the following types, classes, and styles: 2.1 Type. The siren shall be

4、 one of the following types (see 7.3(b): Type I - Complete siren, including an amplifier with attached microphone, amplifier mounting bracket and hardware, microphone mounting clip, interconnecting wire harness, speaker(s), and speaker mounting bracket(s) and hardware Type II - Amplifier with attach

5、ed microphone, amplifier mounting bracket and hardware, microphone mounting clip, and interconnecting wire harness 2.2 Class. The siren shall be one of the following classes (see 7.3(c): Class A - Operates on a nominal 12 volt power supply Class B - Operates on a nominal 24 volt power supply 2.3 Sty

6、le. The siren shall be one of the following styles (see 7.3(d): Style 1 - Single-speaker system Style 2 - Two-speaker system Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-A-A-50796A 2 3. SALIENT CHARACTERISTICS. 3.1 Design and construction. The sir

7、en shall be of compact design and sufficiently rugged to withstand shock and stress incidental to use on an emergency response vehicle. 3.1.1 Overall Dimensions. The maximum overall dimensions of the amplifier, including the mounting bracket, shall be not more than eight inches wide, five inches hig

8、h, and nine inches deep. 3.1.2 Materials. The amplifier housing shall be made of 18 gauge steel or heavier to provide strength and electromagnetic shielding. Metals used in the manufacture of the siren equipment shall be either corrosion resistant or treated to prevent corrosion. The use of dissimil

9、ar metals, especially brass, copper, or steel in intimate contact with aluminum or aluminum alloy shall be avoided. Protective coatings which will crack, chip, peel or scale with age shall be avoided. When materials are used that are nutrients for fungi and they are not hermetically sealed, they sha

10、ll be treated with a fungicidal agent. The siren shall be wired with a type of wire which conforms to MIL-DTL-16878/1, “Wire, Electrical, Polyvinyl Chloride (PVC) Insulated, 105 C, 600 Volts (Not for Navy Shipboard Use)“. 3.1.3 Components. 3.1.3.1 Amplifier bracket. The amplifier assembly with mount

11、ing bracket shall be designed for mounting above or under the dashboard. The amplifier mounting bracket shall allow the amplifier to be readily removed for repair purposes. 3.1.3.2 Power indicator. The amplifiers front panel illumination and/or power-on indication shall be by a non-glare pilot light

12、. 3.1.3.3 Power switch. The amplifiers power shall be controlled by an on-off switch located on the volume control, or by a separate on-off switch. 3.1.3.4 Microphone. The microphone shall be a magnetic or noise cancelling carbon type. 3.1.3.4.1 Microphone cord. The microphone cord shall be the coil

13、 type and shall have an extended length of 8 feet 1 foot. 3.1.3.5 Speaker system elements. Speakers and mounting brackets, when mounted on the exterior of the vehicle, shall be able to withstand a relative wind velocity of 100 miles per hour. 3.1.3.5.1 Speaker brackets. The speaker mounting bracket

14、shall be designed to position the speaker on the vehicle centerline (if one speaker). The speaker bracket shall be designed in such a manner as to prevent easy removal by vandals. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-A-A-50796A 3 3.1.3.5.2

15、 Speaker wires. Interconnecting speaker wire shall be, at minimum, 18 AWG stranded wire conforming to the requirements of 3.1.2, and a minimum of 15 feet long, unless otherwise specified (see 7.3(e). 3.1.4 Circuit design. The electronic siren shall be constructed to use a floating ground return and

16、shall not use the chassis for ground return. The siren shall not be required to operate on reversed polarity power connections, but shall not be damaged by such connections. 3.1.4.1 Power isolation. The amplifiers output shall be isolated from the primary input power by a transformer to prevent shor

17、ting the battery or damaging the internal components of the electronic siren in case the output becomes grounded. 3.1.4.2 Circuit protection. Internal circuit protection shall be provided by a fast- blow fuse (15 amps) or circuit breaker. 3.1.4.3 Operating current requirements. a. Class A siren. (1)

18、 Maximum standby current shall be 0.5 amp. (2) With one speaker (driver), the maximum current shall be 6 amps. (3) With two speakers (drivers), the maximum current shall be 12 amps. b. Class B siren. (1) Maximum standby current shall be 0.6 amp. (2) With one speaker (driver), the maximum current sha

19、ll be 4 amps. (3) With two speakers (drivers), the maximum current shall be 6 amps. 3.1.4.4 Public address (PA) system. The minimum input required for operation of the PA system shall be 0.55 volt root-mean-square (rms) into an average load of 8 ohms. 3.1.5 Electromagnetic compatibility. Siren equip

20、ment provided to the government under this CID shall be compatible with radio communications equipment used on first-responder vehicles. 3.1.6 Environmental requirements. The siren shall be operable in the temperature range from -40 C (-40 F) to 70 C (158 F) and shall be designed to withstand a rela

21、tive humidity up to 100 percent. The siren shall be designed to withstand vibration for a period of at least 1 hour at 12 Hertz (Hz) 1 Hz, 0.3 centimeter (0.125 inch) peak-to-peak displacement. All speakers shall be weatherproof. 3.1.7 Modes of operation. The following modes of operation shall be se

22、lectable by controls on the front panel of the amplifier assembly. These modes shall be clearly marked as indicated: a. Public address (PA) mode. This mode connects the microphone to the amplifier for use as a public address system. This mode shall be marked as “PA“. b. Radio mode. This mode amplifi

23、es calls received on a vehicle two-way radio through the PA system. This mode shall be marked as “RADIO“. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-A-A-50796A 4 c. Manual mode. This mode enables the operator to manually control the siren pitch.

24、 This mode shall be marked as “MANUAL“. d. Wail mode. In this mode, the siren produces continuous automatic cycling of increasing and decreasing sound level as specified in 3.2(d). This mode shall be marked as “WAIL“. e. Yelp mode. In this mode, the siren produces a continuous automatic cycling of i

25、ncreasing and decreasing sound level as specified in 3.2(e). This mode shall be marked as “YELP“. 3.2 Performance requirements. Siren sound pressure level requirements shall be verified in accordance with the methods specified in ANSI S1.13, “Measurement of Sound Pressure Levels in Air“. a. Sound le

26、vels. Measurements shall be made with 11-ohm, 75-watt speakers/drivers. b. PA sound output. All measurements shall be made using a 1 volt rms test tone at 1000 Hz (see 7.4). With one speaker, the minimum PA sound output shall be 112 decibels (dB) at 10 feet. With two speakers, the minimum PA sound o

27、utput shall be 116 dB at 10 feet. c. Siren sound output. With one speaker, the minimum siren sound output shall be 114 dB at 10 feet. With two speakers, the minimum siren sound output shall be 118 dB at 10 feet. The siren output shall be a symmetrical square wave. The lowest fundamental frequency sh

28、all be between 250 Hz and 750 Hz. The frequency shall rise at least 900 Hz. d. Wail. The siren shall produce a continuous automatic cycling of increasing and decreasing sound levels at a rate of 7-15 cycles per minute. e. Yelp. The siren shall produce a continuous automatic cycling of increasing and

29、 decreasing sound levels at a rate of 100-225 cycles per minute. f. Audio frequency response. The audio frequency response shall be flat within 3 dB from 250 to 4,000 Hz, at rated power. The zero dB reference shall be measured at 1,000 Hz. 3.3 Identification markings. The amplifier boxes shall be pe

30、rmanently marked with the manufacturers identification and the model designation in accordance with MIL-STD-130, “Identification Marking of U.S. Military Property“. Drivers shall be marked to denote manufacturer, model, and power rating in accordance with MIL-STD-130. 3.4 Workmanship. The finished s

31、iren and individual accessories shall be free from burrs, slivers, sharp edges, dents, and fractures. All cords, cables and interconnecting wire harnesses shall be free from kinks, nicks, cuts, burned or melted insulation, and excessive solder wicking. Bolts, nuts and screws shall not be missing, lo

32、ose, fractured, or stripped. 4. REGULATORY REQUIREMENTS. 4.1 Recovered materials. The offeror/contractor is encouraged to use recovered materials to the maximum extent practicable, in accordance with paragraph 23.403 of the Federal Acquisition Regulation (FAR). Provided by IHSNot for ResaleNo reprod

33、uction or networking permitted without license from IHS-,-,-A-A-50796A 5 5. PRODUCT CONFORMANCE PROVISIONS. 5.1 Product conformance. The products provided shall meet the salient characteristics of this CID, conform to the producers own drawings, specifications, standards, and quality assurance pract

34、ices, and be the same product offered for sale in the commercial marketplace. The government reserves the right to require proof of such conformance. 5.2 Market acceptability. The products offered must have been previously sold either to the government or on the commercial market. 6. PACKAGING. 6.1

35、Preservation, packing, and marking. Preservation, packing, and marking shall be as specified in the acquisition order (see 7.3(f). 7. NOTES. 7.1 Part or identification number (PIN). The following PIN procedure is for government purposes and does not constitute a requirement for the contractor. AA507

36、96 - X X X Style: 1 - One speaker 2 - Two speakers Class: A - 12 volts B - 24 volts Type: 1 - I - Complete siren 2 - II - Amplifier CID Number Example of reference part number: AA50796 - 1 A 1 7.2 Sources of documents. 7.2.1 FAR. The FAR may be obtained from the Superintendent of Documents, P.O. Box

37、 371954, Pittsburgh, PA 15250-7954. Electronic copies may be obtained from https:/www.acquisition.gov/far/. 7.2.2 Military specifications and standards. Copies of military specifications and standards may be obtained from Standardization Documents Order Desk, 700 Robbins Avenue, Building 4D, Philade

38、lphia, PA 19111-5094. Electronic copies may be obtained from https:/assist.daps.dla.mil/. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-A-A-50796A 6 7.2.3 ANSI standards. Copies of ANSI standards may be obtained from the American National Standards

39、 Institute, 25 West 43rd Street, 4th Floor, New York, NY 10036. Electronic copies may be obtained from http:/web.ansi.org/. 7.3 Ordering data. The acquisition order should specify the following information: a. CID document number, revision, and CID PIN. b. Type (see 2.1). c. Class (see 2.2). d. Styl

40、e (see 2.3). e. Alternate speaker wire requirements (see 3.1.3.5.2). f. Preservation, packing, and marking (see 6.1). 7.4 Hearing safety. Test personnel are cautioned to wear hearing protection when performing testing as described in 3.2. 7.5 Subject term (key word) listing. Amplifier Emergency resp

41、onse Law enforcement Microphone Public address system Sound pressure level Speaker Wail Yelp MILITARY INTERESTS: CIVIL AGENCY COORDINATING ACTIVITY: Custodians: GSA - FAS Air Force - 99 DLA - GS Review Activity: DLA - IS Preparing Activity: DLA - GS2 (Project 6350-2012-001) NOTE: The activities list

42、ed above were interested in this document as of the date of this document. Since organizations and responsibilities can change, you should verify the currency of the information above using the ASSIST database at https:/assist.daps.dla.mil/. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-