标准 SAE 美国机动车工程师.pdf
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1、SAE Technical Standards Board Rules provide that: “This report is published by SAE to advance the state of technical and engineering sciences. The use of this report is entirely voluntary, and its applicability and suitability for any particular use, including any patent infringement arising therefr
2、om, is the sole responsibility of the user.” SAE reviews each technical report at least every five years at which time it may be reaffirmed, revised, or cancelled. SAE invites your written comments and suggestions. Copyright 2007 SAE International All rights reserved. No part of this publication may
3、 be reproduced, stored in a retrieval system or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without the prior written permission of SAE. TO PLACE A DOCUMENT ORDER:Tel: 877-606-7323 (inside USA and Canada) Tel: 724-776-4970 (outside USA) Fa
4、x: 724-776-0790 Email: CustomerServicesae.org SAE WEB ADDRESS:http:/www.sae.org AEROSPACE INFORMATION REPORT AIR4465 Issued1992-03 Reaffirmed2007-01 Design and Handling Guide Radio Frequency Absorptive Type Wire and Cables (Filter Line, MIL-C-85485) RATIONALE This document has been reaffirmed to com
5、ply with the SAE 5-year Review policy. FOREWORD Todays performance needs for military, avionics, and ordnance systems require increasingly sophisticated electronic equipment and greater use of composite structures. As operational requirements become more critical, the level of electromagnetic interf
6、erence (EMI) protection for electrical equipment is increasing. Filter line interconnect systems provide a high degree of EMI protection while functioning as conventional electrical wiring systems. In aircraft, most control and monitor signals operate at frequencies substantially below 50 MHz, where
7、as most interference sources operate in the high VHF, UHF, and SHF bands (e.g., radio, IFF, radar, EW, etc.). By effectively attenuating these sources of interference on susceptible control and monitor wiring, filter line wiring efficiently serves the dual roles of filtering and interconnection. Fil
8、ter line wiring can also be useful for nonaviation installations where the pass band and stop band characteristics fit the system needs. Filter line interconnect systems consist of high-performance MIL-SPEC wire and cable and termination devices that, when used as specified, suppress conducted and r
9、adiated EMI above 100 MHz. It provides a reliable alternative to conventional discrete filters and filter-pin connectors. Filter line cables are flexible, lightweight and can be used with most high-density MIL-SPEC connectors. Filter line wire and cable performance requirements and construction deta
10、ils are specified in MIL-C-85485. Proven filter line termination devices include back shell adapters, braid splicers, shield terminators, and shield splices. These components provide 360, low-impedance terminations at connectors; a must for efficient EMI protection. They also permit easy repair of c
11、onnectors without disconnecting shield terminations. Copyright SAE International Provided by IHS under license with SAELicensee=Defense Supply Ctr/5913977001 Not for Resale, 12/04/2007 18:45:29 MSTNo reproduction or networking permitted without license from IHS -,-,- SAE AIR4465 - 2 - FOREWORD (Cont
12、inued) This design guide consists of three chapters: a.Introduction b.Designing with filter line c.Constructing harnesses with filter line The purpose of this manual is to provide practical suggestions to both designers and end users in dealing with the applications and manufacturing of harnesses ut
13、ilizing filter line wiring. Copyright SAE International Provided by IHS under license with SAELicensee=Defense Supply Ctr/5913977001 Not for Resale, 12/04/2007 18:45:29 MSTNo reproduction or networking permitted without license from IHS -,-,- SAE AIR4465 - 3 - TABLE OF CONTENTS 1.SCOPE .6 2.REFERENC
14、ES .6 3.WHAT IS FILTER LINE.6 3.1Principle of Operation .8 3.1.1Design Rule 10 3.2Applications.10 4.DESIGNING A SYSTEM WITH FILTER LINE 13 4.1Penetration of an EMI Protected Enclosure13 4.2Bundling and Cabling16 4.3Production Breaks.19 4.4Terminal Blocks/Terminal Strips 19 4.5EMI Shields and Shield
15、Terminations .19 4.5.1Shields and Terminations at Protected (or Victim) Box I/O Connectors19 4.5.2Shields and Terminations at Production Breaks .24 4.5.3Shields and Terminations at Terminal Blocks/Terminal Strips.24 4.6Filter Line Designers Checklist.25 5.PERFORMANCE26 5.1Electrical Characteristics.
16、26 5.1.1Attenuation as a Function of Length and Frequency 26 5.1.2Attenuation as a Function of Cable Construction26 5.1.3Protection Against Radiated EMI29 5.1.4Effect of Termination on Filter Line Performance29 5.2Physical Characteristics30 5.2.1Ruggedness30 6.HARNESSING METHODS, TECHNIQUES, AND REC
17、OMMENDATIONS40 6.1Shop Handling Characteristics of Filter Line.40 6.1.1Primary Filter Line.40 6.1.2Stripping Primary Filter Line Wire .40 6.1.3Filter Line Shields and Jackets .42 6.2Terminating EMI Shields .42 6.2.1Terminating Individual EMI Shields.42 6.2.2Terminating Gross EMI Shields.43 6.2.3Term
18、inating Gross Shields and Individual Shields Combined.45 Copyright SAE International Provided by IHS under license with SAELicensee=Defense Supply Ctr/5913977001 Not for Resale, 12/04/2007 18:45:29 MSTNo reproduction or networking permitted without license from IHS -,-,- SAE AIR4465 - 4 - TABLE OF C
19、ONTENTS (Continued) 6.3Instructions for Preparation.45 6.3.1Preparation for Optimum Performance of Shielded and Jacketed Cables for Connector Termination (for Cable Shields with Good Push Back and Severe EMI Vulnerability)46 6.3.2Alternate Method for Preparing Shielded and Jacketed Cables .47 6.3.3T
20、ermination of Bundled Shielded and Jacketed Cables to a Connector Using an Adapter and Braid Splicer (for Cables with Severe EMI Vulnerability)48 6.3.4Termination of a Gross-shielded Wire and Cable Bundle to a Connector Using a Heat Shrinkable Ring Adapter and Braid Splicer (for Cables with Severe E
21、MI Vulnerability) .50 FIGURE 1Filter Line Wire and Cable Constructions. 7 FIGURE 2Jacketed, Shielded Constructions 9 FIGURE 3Filter Line Wires 11 FIGURE 4Filter Line Primaries Mixed with Regular Primary Wire.14 FIGURE 5Filter Line Primary Wire and Cable with Gross Shield Terminated to an I/O Connect
22、or Contact.15 FIGURE 6Standard Primary Wire Mixed with Filter Line Wire in an Overall Shielded Harness Connecting Multiple Black Boxes 17 FIGURE 7Filter Line Primaries and Shielded and Jacketed Filter Line Cables in a Gross Shielded Harness 18 FIGURE 8Filter Line Harness Branch Connected to a Victim
23、 Box Via an I/O Connector21 FIGURE 9Filter Line Primaries and Cables with a Gross EMI Shield and Shield Terminator Device .22 FIGURE 10Filter Line Shielded and Jacketed Cables (Without a Gross EMI Shield) and Shield Terminator Device .23 FIGURE 11Attenuation of a Single Shielded and Jacketed Filter
24、Line Primary Showing the Length and Frequency Dependency 27 FIGURE 12Attenuation Comparison; #1 Single Shielded and Jacketed Filter Line Cable, #2 One of Nineteen Member Shielded Filter Line Bundle .28 FIGURE 13Zt Comparison of MIL-W-81044 Shielded Airframe Wire to Same AWG Size Filter Line Shielded
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