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