1、 INCH-POUND MIL-DTL-24643/75 13 December 2011 DETAIL SPECIFICATION SHEET CABLE, ELECTRICAL, -55 C TO +105 C, 300 VOLTS, TYPE LSLCFS-25 This specification is approved for use by all Departments and Agencies of the Department of Defense. The requirements for acquiring the product described herein shal
2、l consist of this specification sheet and MIL-DTL-24643. This cable is a low-capacitance foil-shielded 12 twisted pair intended for use with computer RS232/422/485 serial transmissions and is intended to connect computers and peripheral devices from a 25-pin grounded serial interface. Construction,
3、Non-Watertight First - Copper conductor (coated or uncoated), 24 AWG, ASTM B8, Class B stranding, 7 strands. Second - Thermoset insulation. Wall thickness as necessary for the completed cable to meet the specified electrical requirements. Solid color code to be applied using Method 3; see figure 1 f
4、or colors required. Maximum diameter shall not exceed 0.055 inch. Third - Two insulated conductors, twisted together such that they meet the electrical requirements specified herein. Twist lengths shall not exceed 1.5 inches. Fourth - 12 pairs and one insulated conductor cabled together with a lay a
5、s required to meet electrical requirements specified herein (see figure 1). Cabling sequence shall be consecutive, starting with number 1 from the center outward. Fillers are not permitted in this cable. Fifth - Binder tape applied with overlap. Sixth - Drain wire, copper conductor (coated or uncoat
6、ed), stranded, 24 AWG, ASTM B8, Class B stranding, 7 strands. Seventh - Copper foil/polyester tape. Metallic side facing in and in contact with the drain wire. Eighth - Cross-linked polyolefin jacket. Minimum wall thickness of 0.040 inch. AMSC N/A FSC 6145 Provided by IHSNot for ResaleNo reproductio
7、n or networking permitted without license from IHS-,-,-MIL-DTL-24643/75 Color Code Pr 1 BLU/WHT Pr 2 ORN/WHT Pr 3 GRN/WHT Pr 4 BRN/WHT Pr 5 GRA/WHT Pr 6 RED/BLU Pr 7 RED/ORN Pr 8 RED/GRN Pr 9 RED/BRN Pr 10 RED/GRA Pr 11 BLK/BLU Pr 12 BLK/ORN Single WHT FIGURE 1. Illustration of construction. TABLE I
8、. Details. Military part no. M24643/75 Type Number of pairs Overall diameter (inches) min. max. -01UO LSLCFS-25 12.5 0.450 0.530 REQUIREMENTS: Qualification required. INSPECTION: Basic Electricals: DC resistance (ohms/1000 feet at 25 C, max.) 25.67 Voltage withstand (volts, root mean square, min.) C
9、onductor to conductor 2000 Conductor to overall shield 1000 Insulation resistance (megohms/1000 feet, min.) Conductor to conductor 500 Conductor to overall shield 500 Jacket flaws No failure Conductor and shield continuity No failure 2 Provided by IHSNot for ResaleNo reproduction or networking permi
10、tted without license from IHS-,-,-MIL-DTL-24643/75 Group A: Visual and dimensional No failure Capacitance Mutual capacitance at 1 kilohertz (kHz) (pF/m, max.) 45 Between conductor and shield at 1 kHz (pF/m, max.) 80 Character impedance, at 1 megahertz (MHz) (ohms) 10015 Group B: Drip (951 C) Not app
11、licable Cold bending, cable (when tested at -55 C) No failure Physicals (unaged) Insulation Tensile strength (lb/in2, min.) 700 Elongation (percent, min.) 150 Jacket Tensile strength (lb/in2, min.) 1300 Elongation (percent, min.) 160 Tear (lb/in thickness, min.) 35 Thermoset proof test (percent, max
12、.) Insulation 50Jacket (when tested at 200 C) 50 Group C: Physicals (aged) air oven Insulation (when tested at 136 C) Tensile strength (percent of unaged, min.) 75 Elongation (percent of unaged, min.) 75 Jacket Tensile strength (percent of unaged, min.) 60 Elongation (percent of unaged, min.) 60 Shr
13、inkage No failureHeat distortion (percent of unaged, max.) 30 Shield conformance to material and application No failure Permanence of printing (jacket) (cycles, min.) 125 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-24643/75 Surface tran
14、sfer impedance Milliohms per meter (max.) Not applicable EMP response (dB, min.) Not applicable Group D: Flame propagation (cable) No failure Qualification Inspection: Qualification inspection shall include basic electricals; groups A, B, C, and D; plus the following: Aging and compatibility (cable)
15、 (1255 C) No failure Abrasion resistance (jacket) No failure Acid gas equivalent (percent, max.) Jacket 2 Insulation 18Halogen content (percent, max.) Jacket 0.2 Insulation 0.2 Immersion (jacket) Tensile strength (percent of unaged, min.) 50 Elongation (percent of unaged, min.) 50 Smoke index (max.)
16、 Jacket 25 Insulation 45Toxicity index (max.) Jacket 5 Insulation 1.5 Durometer (jacket) - Type A (hardness, min.) 80 Weathering (jacket) No failure Electrical moisture absorption No failure UNIT ORDERING LENGTHS: Type and size Feet (nominal) LSLCFS-25 1000 4 Provided by IHSNot for ResaleNo reproduc
17、tion or networking permitted without license from IHS-,-,-MIL-DTL-24643/75 5 Custodians: Preparing Activity:Army MI Navy SH Navy SH (Project 6145-2011-033) Review Activities: Army AR, AV, CR Navy CG, EC DLA CC 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 https:/assist.daps.dla.mil. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
