ASTM E1851-15
Standard Test Method for Electromagnetic Shielding Effectiveness of Durable Rigid Wall Relocatable Structures

Standard No.

ASTM E1851-15

Release Date

2015

Published By

American Society for Testing and Materials (ASTM)

Status

Be replaced

Replace By

ASTM E1851-21

Latest

ASTM E1851-21

Scope

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 to 160 kHz and 14 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 to 500 MHz, 900 to 1000 MHz, and 8.5 to 10.5 GHz.

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 11.1.1 and 11.2.1<......

ASTM E1851-15 Referenced Document

• ASTM E1749 Standard Terminology Relating to Rigid Wall Relocatable Shelters
• ASTM E631 Standard Terminology of Building Constructions

ASTM E1851-15 history

• 2021 ASTM E1851-21 Standard Test Method for Electromagnetic Shielding Effectiveness of Durable Rigid Wall Relocatable Structures
• 2015 ASTM E1851-15 Standard Test Method for Electromagnetic Shielding Effectiveness of Durable Rigid Wall Relocatable Structures
• 2009 ASTM E1851-09 Standard Test Method for Electromagnetic Shielding Effectiveness of Durable Rigid Wall Relocatable Structures
• 2004 ASTM E1851-04 Standard Test Method for Electromagnetic Shielding Effectiveness of Durable Rigid Wall Relocatable Structures
• 2002 ASTM E1851-02 Standard Test Method for Electromagnetic Shielding Effectiveness of Durable Rigid Wall Relocatable Structures
• 1997 ASTM E1851-97 Standard Test Method for Electromagnetic Shielding Effectiveness of Durable Rigid Wall Relocatable Structures