1、 MIL-DTL-49285/7A INCH-POUND15 May 2009 SUPERSEDING MIL-C-49285/7 19 October 1989 DETAIL SPECIFICATION SHEET CABLE, SPECIAL PURPOSE, ELECTRICAL, ONE INDIVIDUALLY SHIELDED PAIR OF 22 AWG SOLID WIRE Inactive for new design after 16 June 1997. This specification is approved for use by all Departments a
2、nd Agencies of the Department of Defense. The requirements for acquiring the product described herein shall consist of this specification sheet and MIL-DTL-49285. AMSC N/A FSC 6145 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-49285/7A Engi
3、neering information: See table I. Note: Not for aerospace use. TABLE I. Description, electrical. Electrical characteristics Requirements Nominal capacitance between conductors Nominal capacitance between the conductor and the shield with one conductor tied to the shield Continuous working voltage Sh
4、ield dc resistance 40 pF/ft (picofarads/foot) 76 pF/ft 200 V rms maximum between conductors 14 ohms/1,000 feet maximum TABLE II. Description, physical. Components Construction details Number of pairs Conductor type and wire size Conductor insulation Conductor insulation thickness Drain wire type and
5、 size Jacket material Jacket thickness Finished cable diameter Cable style (UL) Tensile strength (jacket) Elongation (jacket) Overall cabling lay length One individually shielded Stranded tinned copper 22 AWG Polypropylene 0.006 inch nominal thickness Stranded tinned copper 22 AWG Polyvinyl chloride
6、 0.018 inch 0.129 inch maximum outside diameter Not applicable 2,000 pounds per square inch minimum 150 percent minimum 6.8 twists per foot 10 percent REQUIREMENTS: Design and construction. See table II. Shield color code. The shield color shall be blue. Shield location and orientation. The polyeste
7、r aluminum shield is to be located on the outer circumference of the pair, with the aluminum foil side outward. Insulation on the interior of the shield is to be complete with no aluminum available for contact. Drain wire location. The drain wire is to be spirally located between the shield and jack
8、et, and is to be in continuous contact with the aluminum surface of the foil shield throughout the cable. 2Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-49285/7A Cable temperature rating. The cable temperature rating shall be -20C to +80C.
9、Flammability. The cable shall pass UL 2556 flame test requirements. Construction. Cabled on a common axis to reduce the diameter. Shield integrity test.* Frequency Response * 100 kHz 115 dB below reference 500 kHz 105 dB below reference 1 MHz 98 dB below reference 5 MHz 85 dB below reference 10 MHz
10、80 dB below reference 15 MHz 76 dB below reference 20 MHz 72 dB below reference 25 MHz 68 dB below reference 30 MHz 66 dB below reference * Any two readings may deviate to a value of 0.9 times the stated limits. * All values are a minimum numerical value. Fixture resonance will occur between 40 and
11、70 MHz. At 100 MHz: At least 48 dB below reference. Crosstalk test limits. Crosstalk testing is not required for this configuration. Durometer hardness. The cable jacket shall have a “Shore A” hardness of 90 5. Part or Identifying Number (PIN). The PIN shall be M49285/07. Changes from previous issue
12、. The margins of this specification are marked with vertical lines to indicate where changes from the previous issue were made. This was done as a convenience only and the Government assumes no liability whatsoever for any inaccuracies in these notations. Bidders and contractors are cautioned to eva
13、luate the requirements of this document based on the entire content irrespective of the marginal notations and relationship to the last previous issue. Referenced documents. In addition to MIL-DTL-49285, this document references the following: UL 2556. 3Provided by IHSNot for ResaleNo reproduction o
14、r networking permitted without license from IHS-,-,-MIL-DTL-49285/7A 4CONCLUDING MATERIAL Custodians: Preparing activity: Army CR DLA - CC Navy SH Air Force 85 DLA - CC Review activities: Army MI (Project 6145-2008-156) Air Force - 99 NOTE: The activities listed above were interested in this documen
15、t 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 Online database at http:/assist.daps.dla.mil. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
