1、 MIL-DTL-49285/38A 10 February 2010 SUPERSEDING MIL-C-49285/38 19 October 1989 DETAIL SPECIFICATION SHEET CABLE, SPECIAL PURPOSE, ELECTRICAL, SIX INDIVIDUALLY SHIELDED PAIRS OF 24 (7 X 32) AWG WIRE This specification is approved for use by all Departments and Agencies of the Department of Defense. T
2、he requirements for acquiring the product described herein shall consist of this specification sheet and MIL-DTL-49285. FIGURE 1. Cable illustration. AMSC N/A FSC 6145 INCH-POUND Inactive for new design after 16 June 1997. Provided by IHSNot for ResaleNo reproduction or networking permitted without
3、license from IHS-,-,-MIL-DTL-49285/38A 2 Engineering 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 tie
4、d to the shield Continuous working voltage Normal capacitance between adjacent shields Continuous working voltage between adjacent shields Shield dc resistance 12 pF/ft (picofarads/foot) 23 pF/ft 300 V rms maximum between conductors 150 pF/ft 50 volts maximum 20.5 ohms/1,000 feet maximum TABLE II. D
5、escription, physical. Components Construction details Number of pairs Conductor type and wire size Conductor stranding Conductor insulation Conductor insulation thickness Drain wire type and size Drain wire stranding Jacket material Jacket thickness Finished cable diameter Cable style (UL) Tensile s
6、trength (jacket) Elongation (jacket) Overall cabling lay lengths Six individually shielded Stranded tinned copper 24 AWG 7 X 32 AWG Expanded polypropylene 0.023 inch nominal thickness Stranded tinned copper 24 AWG 19 X 36 AWG Polyvinyl chloride 0.048 inch 0.500 inch maximum outside diameter 2493 2,0
7、00 pounds per square inch minimum 150 percent minimum 1.3 twists per foot 10 percent The position of the red and green pair shield shall determine the rotation direction for pair location (see figure 1). Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-
8、,-MIL-DTL-49285/38A 3 TABLE III. Shield color code. Pair number Shield color 1stpair 2ndpair 3rdpair 4thpair 5thpair 6thpair Red Green Blue 1 Blue 2 Blue 3 Blue 4 REQUIREMENTS: Design and construction: See table II. Shield location and orientation. The polyester aluminum shield is to be located on t
9、he 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 noise reducing tape and the aluminum foil shield, and i
10、s to be in continuous contact with the aluminum surface of the foil shield and the noise reducing tape throughout the cable. Cable temperature rating. The cable temperature rating shall be -20C to +80C. Flammability. The cable shall pass UL 2556 flame test requirements. Shield integrity test.* Frequ
11、ency Response * 100 kHz 110 dB below reference 500 kHz 104 dB below reference 1 MHz 98 dB below reference 5 MHz 84 dB below reference 10 MHz 77 dB below reference 15 MHz 70 dB below reference 20 MHz 65 dB below reference 25 MHz 61 dB below reference 30 MHz 57 dB below reference 100 MHz 38 dB below r
12、eference * 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 70 MHz. Crosstalk test limits. All values are minimums. Frequency (kHz) Nead end crosstalk (dB) Far end crosstalk (dB) 40 63 63 7
13、0 59 58 100 56 56 1,000 54 54 Insulation resistance between shields: 100 megohms/1,000 feet (minimum). Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-49285/38A 4 Durometer hardness. The cable jacket shall have a “Shore A” hardness of 82 5. P
14、art or Identifying Number (PIN): The PIN shall be M49285/38. 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 whatsoev
15、er for any inaccuracies in these 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 doc
16、ument references the following: UL 2556. CONCLUDING MATERIAL Custodians: Preparing activity: Army CR DLA - CC Navy SH Air Force 85 DLA CC Review activities: Army MI (Project 6145-2009-030) 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-,-,-
