ASTM E1851-21

Standard Test Method for Electromagnetic Shielding Effectiveness of Durable Rigid Wall Relocatable Structures

SIGNIFICANCE AND USE
5.1 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.  
5.2 Source Fields—Performance of a shielded enclosure is to be assessed for two source fields: magnetic and plane wave.  
5.2.1 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 kHz to 160 kHz and 14 MHz to 16 MHz.  
5.2.2 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 MHz to 500 MHz, 900 MHz to 1000 MHz, and 8.5 GHz 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 kHz to 160 kHz, 14 MHz to 16 MHz, 300 MHz to 500 MHz, 900 MHz to 1000 MHz, and 8.5 GHz to 10.5 GHz. Specific test frequencies within these ranges are required (see 11.1.1 and 11.2.1). Additional measurements in the range of 10 kHz to 10.5 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 standard. The values given in parentheses after SI units are provided for information only and are not considered standard.  
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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.7...

General Information

• Status: Published
• Publication Date: 31-Jan-2021
• ICS: 13.280 - Radiation protection
• Technical Committee: E06 - Performance of Buildings
• Drafting Committee: E06.53 - Materials and Processes for Durable Rigidwall Relocatable Structures

Standards Content (Sample)

This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation:E1851 −21
Standard Test 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 the frequency range may be extended from 50 Hz to 40 GHz.
Appendix X1 provides guidance on selecting measurement
1.1 This test method covers the determination of the elec-
frequencies.
tromagnetic shielding effectiveness of durable relocatable
shielded enclosures. 1.3 This test method is not applicable to individual compo-
1.1.1 The intended application of this test method is for nents such as separate walls, floors, ceilings, or shielded racks.
virgin shielded enclosures that do not have any equipment or
1.4 This standard may involve hazardous materials,
equipment racks. It is recommended that tests be conducted
operations, equipment, or any combination.
before the interior finish work begins. However, the shield
1.5 The values stated in SI units are to be regarded as
assembly including all enclosure penetrations shall be com-
standard. The values given in parentheses after SI units are
pleted and required penetration protection devices shall be
provided for information only and are not considered standard.
installed in accordance with the design specification. The test
method can also be used on existing shielded enclosures after 1.6 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
repair work is done to verify workmanship, but it may be
necessary to remove equipment or equipment racks to gain responsibility of the user of this standard to establish appro-
priate safety, health, and environmental practices and deter-
access to a test area.
1.1.2 The test procedures delineated in this document are mine the applicability of regulatory limitations prior to use.
1.7 This international standard was developed in accor-
comprehensive and may require several days to complete for a
dance with internationally recognized principles on standard-
room-sizeshieldedenclosure.Ausercanapplythistestmethod
for a first article test that requires proof of concept and ization established in the Decision on Principles for the
Development of International Standards, Guides and Recom-
validation of design and fabrication technique. Appendix X2
provides guidance on choosing test points so shielding effec- mendations issued by the World Trade Organization Technical
Barriers to Trade (TBT) Committee.
tiveness tests on a room-size shielded enclosure may be
completed in about one-half day for which it applies to
2. Referenced Documents
shielded enclosures coming off an assembly line.
2
2.1 ASTM Standards:
1.2 This test method is for use in the following frequency
E631Terminology of Building Constructions
ranges: 140kHz to 160kHz, 14MHz to 16 MHz, 300MHz to
E1749Terminology Relating to Rigid Wall Relocatable
500 MHz, 900MHz to 1000 MHz, and 8.5GHz to 10.5GHz.
Shelters
Specific test frequencies within these ranges are required (see
3
2.2 IEEE Standards:
11.1.1and11.2.1).Additionalmeasurementsintherangeof10
IEEE Std299-1997IEEE Standard Method for Measuring
kHz to 10.5 GHz may be performed. For specific applications,
theEffectivenessofElectromagneticShieldingEnclosures
1 2
This test method is under the jurisdiction of ASTM Committee E06 on For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Performance of Buildings and is the direct responsibility of Subcommittee E06.53 contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
on Materials and Processes for Durable Rigidwall Relocatable Structures. Standards volume information, refer to the standard’s Document Summary page on
Current edition approved Feb. 1, 2021. Published February 2021. Originally the ASTM website.
3
approved in 1997. Last previous edition approved in 2015 as E1851-15. DOI: Available from Institute of Electrical and Electronics Engineers, Inc. (IEEE),
10.1520/E1851-21. 445 Hoes Ln., Piscataway, NJ 08854-4141, http://www.ieee.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
E1851−21
TABLE 1 Test Frequencies and Test Configurations
measured shielding effectiv
...

This document is not an ASTM standard and is intended only to provide the user of an ASTM 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 − 15 E1851 − 21
Standard Test 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. A number 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
1.1 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, 14 140 kHz to 160 kHz, 14 MHz to 16 MHz,
300300 MHz to 500 MHz, 900900 MHz to 1000 MHz, and 8.58.5 GHz to 10.5 GHz. 10.5 GHz. Specific test frequencies within
these ranges are required (see 11.1.1 and 11.2.1). Additional measurements in the range of 10 kHz to 10.5 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 given in parentheses are for information only.after
SI units are provided for information only and are not considered standard.
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 safety, health, and healthenvironmental practices and determine the
applicability of regulatory limitations prior to use.
1
This test method is under the jurisdiction of ASTM 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 Sept. 1, 2015Feb. 1, 2021. Published September 2015February 2021. Originally approved in 1997. Last previous edition approved in 20092015
as E1851-09.-15. DOI: 10.1520/E1851-15.10.1520/E1851-21.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
E1851 − 21
1.7 This international standard was developed in accordance with internationally recognized principles on standardization
established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued
by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
2. Referenced Documents
2
2.1 ASTM Standards:
E631 Terminology of Building Constructions
E1749 Terminology Relating to Rigid Wall Relocatable Shelters
3
2.2 IEEE Standards:
IEEE Std 299-1997 IEEE Standard Method for Measuring the Effectiveness of Electromagnetic Shielding Enclosures
IEEE Std C95.1-1991 IEEE Standard for Safety Levels with Respect to Human Exposure to Radio Frequency Electromagnetic
Fields, 3 kHz to 300 GHz
4
2.3 Military Standard:
4
MIL-ST
...