ASTM E1851-09
(Test Method)Standard Test Method for Electromagnetic Shielding Effectiveness of Durable Rigid Wall Relocatable Structures
Standard Test Method for Electromagnetic Shielding Effectiveness of Durable Rigid Wall Relocatable Structures
SIGNIFICANCE AND USE
This standard provides measurement procedures for determining the electromagnetic shielding effectiveness of durable rigid wall relocatable shielded enclosures. This standard specifies a method for comparing the shielded enclosure performance of structures provided by different suppliers. In addition, this standard is written to minimize variations in measured shielding effectiveness at a given frequency and test point regardless of test personnel, equipment, and test site. Therefore, the shielding effectiveness of a durable rigid wall relocatable shielded enclosure of any size from any supplier can be determined. This standard specifies a minimum set of measurements at a given frequency and a minimum set of frequencies to determine shielding effectiveness.
Source Fields—Performance of a shielded enclosure is to be assessed for two source fields: magnetic and plane wave.
Magnetic Field Measurements—The attenuation provided by a shielded enclosure is assessed by using a local source to generate the near field. The magnetic field measurements are specified for two narrow frequency bands: 140 to 160 kHz and 14 to 16 MHz.
Plane Wave Measurements—The attenuation provided by a shielded enclosure is assessed by using a locally generated distant source or plane wave field. The plane wave measurements are specified for three narrow frequency bands: 300 to 500 MHz, 900 to 1000 MHz, and 8.5 to 10.5 GHz.
SCOPE
1.1 This test method covers the determination of the electromagnetic shielding effectiveness of durable relocatable shielded enclosures.
1.1.1 The intended application of this test method is for virgin shielded enclosures that do not have any equipment or equipment racks. It is recommended that tests be conducted before the interior finish work begins. However, the shield assembly including all enclosure penetrations shall be completed and required penetration protection devices shall be installed in accordance with the design specification. The test method can also be used on existing shielded enclosures after repair work is done to verify workmanship, but it may be necessary to remove equipment or equipment racks to gain access to a test area.
1.1.2 The test procedures delineated in this document are comprehensive and may require several days to complete for a room-size shielded enclosure. A user can apply this test method for a first article test that requires proof of concept and validation of design and fabrication technique. Appendix X2 provides guidance on choosing test points so shielding effectiveness tests on a room-size shielded enclosure may be completed in about one-half day for which it applies to shielded enclosures coming off an assembly line.
1.2 This test method is for use in the following frequency ranges: 140 to 160 kHz, 14 to 16 MHz, 300 to 500 MHz, 900 to 1000 MHz, and 8.5 to 10.5 GHz. Specific test frequencies within these ranges are required (see 10.1.1 and 10.2.1). Additional measurements in the range of 10 kHz to 10.1.5.1 GHz may be performed. For specific applications, the frequency range may be extended from 50 Hz to 40 GHz. Appendix X1 provides guidance on selecting measurement frequencies.
1.3 This test method is not applicable to individual components such as separate walls, floors, ceilings, or shielded racks.
1.4 This standard may involve hazardous materials, operations, equipment, or any combination.
1.5 The values stated in SI units are to be regarded as the standard. The values in parentheses are for information only.
1.6 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
X2.1.1 The test methods described in this appendix can be used to verify quality of workmanship of shielded enclosures coming off an assembly l...
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Designation:E1851 −09
StandardTest Method for
Electromagnetic Shielding Effectiveness of Durable Rigid
1
Wall Relocatable Structures
This standard is issued under the fixed designation E1851; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript 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. Scope 1.3 This test method is not applicable to individual compo-
nents such as separate walls, floors, ceilings, or shielded racks.
1.1 This test method covers the determination of the elec-
1.4 This standard may involve hazardous materials,
tromagnetic shielding effectiveness of durable relocatable
operations, equipment, or any combination.
shielded enclosures.
1.1.1 The intended application of this test method is for
1.5 The values stated in SI units are to be regarded as the
virgin shielded enclosures that do not have any equipment or standard. The values in parentheses are for information only.
equipment racks. It is recommended that tests be conducted
1.6 This standard does not purport to address all of the
before the interior finish work begins. However, the shield
safety concerns, if any, associated with its use. It is the
assembly including all enclosure penetrations shall be com-
responsibility of the user of this standard to establish appro-
pleted and required penetration protection devices shall be
priate safety and health practices and determine the applica-
installed in accordance with the design specification. The test
bility of regulatory limitations prior to use.
method can also be used on existing shielded enclosures after
repair work is done to verify workmanship, but it may be
2. Referenced Documents
necessary to remove equipment or equipment racks to gain
2
2.1 IEEE Standards:
access to a test area.
IEEE Std299-1997IEEE Standard Method for Measuring
1.1.2 The test procedures delineated in this document are
theEffectivenessofElectromagneticShieldingEnclosures
comprehensive and may require several days to complete for a
IEEEStdC95.1-1991 IEEEStandardforSafetyLevelswith
room-sizeshieldedenclosure.Ausercanapplythistestmethod
Respect to Human Exposure to Radio Frequency Electro-
for a first article test that requires proof of concept and
magnetic Fields, 3 kHz to 300 GHz
validation of design and fabrication technique. Appendix X2 3
2.2 Military Standard:
provides guidance on choosing test points so shielding effec-
MIL-STD-188-125 High Altitude Electromagnetic Pulse
tiveness tests on a room-size shielded enclosure may be 4
(HEMP) Protection for Ground Based C I Facilities Per-
completed in about one-half day for which it applies to
forming Critical, Time-Urgent Missions
shielded enclosures coming off an assembly line.
4
2.3 OSHA Standard:
OSHARegulation,29CFR1910,DepartmentofLabor,July
1.2 This test method is for use in the following frequency
1992
ranges: 140 to 160 kHz, 14 to 16 MHz, 300 to 500 MHz, 900
to 1000 MHz, and 8.5 to 10.5 GHz. Specific test frequencies
3. Summary of Test Method
within these ranges are required (see 10.1.1 and 10.2.1).
Additional measurements in the range of 10 kHz to 10.1.5.1
3.1 Test Configuration—A transmitting antenna is con-
GHz may be performed. For specific applications, the fre- nected to an electromagnetic source set to a specific frequency
quency range may be extended from 50 Hz to 40 GHz.
and amplitude. A receiving antenna is placed a specified
Appendix X1 provides guidance on selecting measurement distance from the transmitting antenna, and the received
frequencies.
electromagnetic field level is recorded as a reference or
2
Available from Institute of Electrical and Electronics Engineers, Inc. (IEEE),
1
This test method is under the jurisdiction of ASTM Committee E06 on 445 Hoes Ln., P.O. Box 1331, Piscataway, NJ 08854-1331, http://www.ieee.org.
3
Performance of Buildings and is the direct responsibility of Subcommittee E06.53 Available from Standardization Documents Order Desk, DODSSP, Bldg. 4,
on Materials and Processes for Durable Rigidwall Relocatable Structures. Section D, 700 Robbins Ave., Philadelphia, PA 19111-5098, http://
Current edition approved Nov. 1, 2009. Published December 2009. Originally dodssp.daps.dla.mil.
4
approved in 1997. Last previous edition approved in 2004 as E1851–04. DOI: Available from Occupational Safety and Health Administration (OSHA), 200
10.1520/E1851-09. Constitution Ave., NW, Washington, DC 20210, http://www.osha.gov.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
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E1
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This document is not anASTM standard and is intended only to provide the user of anASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation:E1851–04 Designation: E1851 – 09
Standard Test Method for
Electromagnetic Shielding Effectiveness of Durable Rigid
,
1 2
Wall Relocatable Structures
This standard is issued under the fixed designation E1851; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the Department of Defense.
1. Scope
1.1 This test method covers the determination of the electromagnetic shielding effectiveness of durable relocatable shielded
enclosures.
1.1.1 Theintendedapplicationofthistestmethodisforvirginshieldedenclosuresthatdonothaveanyequipmentorequipment
racks. It is recommended that tests be conducted before the interior finish work begins. However, the shield assembly including
all enclosure penetrations shall be completed and required penetration protection devices shall be installed in accordance with the
design specification. The test method can also be used on existing shielded enclosures after repair work is done to verify
workmanship, but it may be necessary to remove equipment or equipment racks to gain access to a test area.
1.1.2 The test procedures delineated in this document are comprehensive and may require several days to complete for a
room-size shielded enclosure.Auser can apply this test method for a first article test that requires proof of concept and validation
of design and fabrication technique.Appendix X2 provides guidance on choosing test points so shielding effectiveness tests on a
room-size shielded enclosure may be completed in about one-half day for which it applies to shielded enclosures coming off an
assembly line.
1.2 Thistestmethodisforuseinthefollowingfrequencyranges:140to160kHz,14to16MHz,300to500MHz,900to1000
MHz, and 8.5 to 10.5 GHz. Specific test frequencies within these ranges are required (see 10.1.1 and 10.2.1). Additional
measurements in the range of 10 kHz to 10.1.5.1 GHz may be performed. For specific applications, the frequency range may be
extended from 50 Hz to 40 GHz. Appendix X1 provides guidance on selecting measurement frequencies.
1.3 This test method is not applicable to individual components such as separate walls, floors, ceilings, or shielded racks.
1.4 This standard may involve hazardous materials, operations, equipment, or any combination.
1.5 The values stated in SI units are to be regarded as the standard. The values in parentheses are for information only.
1.6 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility
of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory
limitations prior to use.
2. Referenced Documents
3
2.1 IEEE Standards:
IEEE Std299-1997, IEEE Standard Method for Measuring the Effectiveness of Electromagnetic Shielding Enclosures
IEEE StdC95.1-1991,IEEE StdC95.1-1991 IEEE Standard for Safety Levels with Respect to Human Exposure to Radio
Frequency Electromagnetic Fields, 3 kHz to 300 GHz
4
2.2 Military Standard:
4
MIL-STD-188-125, High Altitude Electromagnetic Pulse (HEMP) Protection for Ground Based C I Facilities Performing
Critical, Time-Urgent Missions
1
This test method is under the jurisdiction ofASTM Committee E06 on Performance of Buildings and is the direct responsibility of Subcommittee E06.53 on Materials
and Processes for Durable Rigidwall Relocatable Structures.
Current edition approved Nov. 1, 2004.2009. Published November 2004.December 2009. Originally approved in 1997. Last previous edition approved in 20022004 as
E1851–97.E1851–04. DOI: 10.1520/E1851-049.
2
Available from Institute of Electrical and Electronics Engineers, Inc. (IEEE), 445 Hoes Ln., P.O. Box 1331, Piscataway, NJ 08854-1331.
2
ForreferencedASTMstandards,visittheASTMwebsite,www.astm.org,orcontactASTMCustomerServiceatservice@astm.org.For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
3
Available from Standardization Documents Order Desk, DODSSP, Bldg. 4, Section D, 700 Robbins Ave., Philadelphia, PA 19111-5098.
3
Available from Institute of Electrical and Electronics Engineers, Inc. (IEEE), 445 Hoes Ln., P.O. Box 1331, Piscataway, NJ 08854-1331, http://www.ieee.org.
4
Available from Occupational Safety and Health Administra
...
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