1、 MIL-DTL-49285/31A 1 March 2010 SUPERSEDING MIL-C-49285/31 19 October 1989 DETAIL SPECIFICATION SHEET CABLE, SPECIAL PURPOSE, ELECTRICAL, ONE INDIVIDUALLY SHIELDED PAIR OF 22 (7 X 30) AWG This specification is approved for use by all Departments and Agencies of the Department of Defense. The require
2、ments for acquiring the product described herein shall consist of this specification sheet and MIL-DTL-49285. Engineering information: See table I. Note: Not for aerospace use. TABLE I. Description, electrical. Electrical characteristics Requirements Nominal capacitance between conductors Nominal ca
3、pacitance between the conductor and the shield with one conductor tied to the shield Continuous working voltage Shield dc resistance Conductor dc resistance 52 pF/ft (picofarads/foot) 92 pF/ft 300 V rms maximum between conductors 14.0 ohms/1,000 feet maximum 18.5 ohms/1,000 feet maximum AMSC N/A FSC
4、 6145 INCH-POUND Inactive for new design after 16 June 1997. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-49285/31A 2 TABLE II. Description, physical. Components Construction details Number of pairs Conductor type and wire size Conductor s
5、tranding Conductor insulation Conductor insulation thickness Drain wire type and size Drain wire stranding Jacket material Jacket thickness Finished cable diameter Cable style (UL) Tensile strength (jacket) Elongation (jacket) Overall cabling lay length One individually shielded Stranded tinned copp
6、er 22 AWG 7 X 30 AWG Polyvinyl chloride 0.016 inch nominal thickness Stranded tinned copper 22 AWG 7 X 30 AWG Polyvinyl chloride 0.038 inch 0.212 inch maximum outside diameter 2464 2,000 pounds per square inch minimum 150 percent minimum 9.6 twists per foot 10 percent REQUIREMENTS: Design and constr
7、uction: (see table II): Shield color code. The shield color shall be blue. Shield location and orientation. The polyester 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 a
8、luminum available for contact. Drain wire location. The drain wire is to be spirally located between the shield and jacket, and is to be in continuous contact with the aluminum surface of the foil shield throughout the cable. Cable temperature rating. The cable temperature rating shall be -20C to +8
9、0C. Flammability. The cable shall pass UL 2556 flame test requirements. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-49285/31A 3 Shield integrity test.* Frequency Response * 100 kHz 111 dB below reference 500 kHz 100 dB below reference 1 M
10、Hz 94 dB below reference 5 MHz 76 dB below reference 10 MHz 69 dB below reference 15 MHz 64 dB below reference 20 MHz 60 dB below reference 25 MHz 56 dB below reference 30 MHz 53 dB below reference * Any two readings may deviate to a value of 0.9 times the stated limits. * All values are a minimum n
11、umerical value. Fixture resonance will occur between 40 and 70 MHz. At 100 MHz: At least 37 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 97 3. Part or Identifying Number (P
12、IN): The PIN shall be M49285/31. Changes from previous issue. 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 t
13、hese notations. Bidders and contractors are cautioned to evaluate 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 followi
14、ng: UL 2556. CONCLUDING MATERIAL Custodians: Preparing activity: Army CR DLA - CC Navy SH Air Force 85 DLA - CC Review activity: Army MI (Project 6145-2009-027) Air Force - 71 DLA IS NOTE: The activities listed 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 Online database at http:/assist.daps.dla.mil. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
