1、Designation:E185115Standard Test Method forElectromagnetic Shielding Effectiveness of Durable RigidWall Relocatable Structures1This standard is issued under the fixed designation E1851;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,
2、the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the U.S.Department of Defense.1.Scope1.1 This test method covers th
3、e determination of the elec-tromagnetic shielding effectiveness of durable relocatableshielded enclosures.1.1.1 The intended application of this test method is forvirgin shielded enclosures that do not have any equipment orequipment racks.It is recommended that tests be conductedbefore the interior
4、finish work begins.However,the shieldassembly including all enclosure penetrations shall be com-pleted and required penetration protection devices shall beinstalled in accordance with the design specification.The testmethod can also be used on existing shielded enclosures afterrepair work is done to
5、 verify workmanship,but it may benecessary to remove equipment or equipment racks to gainaccess to a test area.1.1.2 The test procedures delineated in this document arecomprehensive and may require several days to complete for aroom-size shielded enclosure.Auser can apply this test methodfor a first
6、 article test that requires proof of concept andvalidation of design and fabrication technique.Appendix X2provides guidance on choosing test points so shielding effec-tiveness tests on a room-size shielded enclosure may becompleted in about one-half day for which it applies toshielded enclosures com
7、ing off an assembly line.1.2 This test method is for use in the following frequencyranges:140 to 160 kHz,14 to 16 MHz,300 to 500 MHz,900to 1000 MHz,and 8.5 to 10.5 GHz.Specific test frequencieswithin these ranges are required(see 11.1.1 and 11.2.1).Additional measurements in the range of 10 kHz to 1
8、0.5 GHzmay be performed.For specific applications,the frequencyrange may be extended from 50 Hz to 40 GHz.Appendix X1provides guidance on selecting measurement frequencies.1.3 This test method is not applicable to individual compo-nents such as separate walls,floors,ceilings,or shielded racks.1.4 Th
9、is standard may involve hazardous materials,operations,equipment,or any combination.1.5 The values stated in SI units are to be regarded as thestandard.The values in parentheses are for information only.1.6 This standard does not purport to address all of thesafety concerns,if any,associated with it
10、s use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2E631 Terminology of Building ConstructionsE1749 Terminology Relating to R
11、igid Wall RelocatableShelters2.2 IEEE Standards:3IEEE Std 299-1997 IEEE Standard Method for Measuringthe Effectiveness of Electromagnetic Shielding EnclosuresIEEE Std C95.1-1991 IEEE Standard for Safety Levels withRespect to Human Exposure to Radio Frequency Electro-magnetic Fields,3 kHz to 300 GHz2
12、.3 Military Standard:4MIL-STD-188-125 High Altitude Electromagnetic Pulse(HEMP)Protection for Ground Based C4I Facilities Per-forming Critical,Time-Urgent Missions2.4 OSHA Standard:5OSHA Regulation,29 CFR 1910,Department of Labor,July19921This test method is under the jurisdiction of ASTM Committee
13、E06 onPerformance of Buildings and is the direct responsibility of Subcommittee E06.53on Materials and Processes for Durable Rigidwall Relocatable Structures.Current edition approved Sept.1,2015.Published September 2015.Originallyapproved in 1997.Last previous edition approved in 2009 as E1851-09.DO
14、I:10.1520/E1851-15.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.3Available from Institute of Electrical and Ele
15、ctronics Engineers,Inc.(IEEE),445 Hoes Ln.,Piscataway,NJ 08854-4141,http:/www.ieee.org.4Available from DLA Document Services,Building 4/D,700 Robbins Ave.,Philadelphia,PA 19111-5094,http:/quicksearch.dla.mil.5Available from Occupational Safety and Health Administration(OSHA),200Constitution Ave.,NW,
16、Washington,DC 20210,http:/www.osha.gov.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 3.Terminology3.1 DefinitionsSee Terminologies E631 and E1749 fordefinitions of general terms used in this test method.4.Summary of Test Method4.1 Test ConfigurationA transmitting antenna is con-nected to an electromagnetic source set to a specific frequencyand amplitude.A receiving antenna is placed a specifieddistance from the transmitting antenna,
