Example of electromagnetic shielding effectiveness test
Measuring Electromagnetic Shielding Attenuation MIL-STD-285
emctest technologies performs shielding effectiveness tests
EMCTEST Technologies, Via Marecchiese 273, Rimini, ITALY
Phone: +39 0541 728562 | E-Mail: info@emctest.it

MIL-STD-285 - MEASURING THE ELECTROMAGNETIC SHIELDING ATTENUATION

Shielding effectiveness test following the Standard MIL-STD-285:
  • The Standard MIL-STD-285 (actually replaced by IEEE-299) is called coplanar setup and it describes uniform procedures for measuring SE for enclosures at frequencies from 9 kHz to 18 GHz (extendable down to 50 Hz and up to 100 GHz), although the smallest linear dimension of the enclosure is assumed to be at least 2 m; the selection of 2 m as the smallest linear dimension was originally based upon being able to fit a typical bicone-style antenna inside an enclosure to perform plane-wave testing down to the range from 30 to 50 MHz.
    The standard does not give any limits for pass/fail, leaving to the owner of the shielding enclosure to provide these limits.
    In addition, although the standard suggests a range of test frequencies that can provide confidence in the effectiveness of the shield, it is clearly stated that the actual test frequencies must be chosen according to a test planapproved by the shield owner, the tester, and the shielding provider/vendor.
    The measurement range in this method is divided into three subranges and in each subregion, some subgroups of testing frequencies are suggested:
    1. A low-frequency range, from 9 kHz (50 Hz) to 20 MHz (a single frequency is suggested within 9–16 kHz, 140–160 kHz, and 14–16 MHz) where the SE is defined in terms of magnetic-field performance.
    2. A resonant range, from 20 to 300 MHz, where the SE is expressed in terms of either electric field or power.
    3. A high-frequency range from 300 MHz to 18 GHz (100 GHz) (a single frequency is suggested within 300–600 MHz, 600–1000 MHz, 1–2 GHz, 2–4 GHz, 4–8 GHz, and 8–18 GHz) where the shielding performance of the enclosure is expressed in power terms.
    EMCTEST Technologies is a leading test laboratory in Italy and Europe for electromagnetic shielding effectiveness testing. Thanks to advanced instrumentation and extensive experience in the field, we perform measurements from 10 kHz to 110 GHz on materials and devices intended for industrial, telecommunications, medical, military, automotive, railway, marine, aerospace, scientific, governmental, and civil applications.

    Typical Test Frequencies

    • Low frequency: 10 kHz, 100 kHz, 500 kHz, 1 MHz
    • Mid frequency: 10 MHz, 30 MHz, 100 MHz, 433 MHz, 700 MHz, 800 MHz, 900 MHz
    • High frequency (RF and microwave): 1 GHz, 1.5 GHz, 2.4 GHz (ISM band), 3 GHz, 5 GHz, 5.8 GHz, 6 GHz, 10 GHz
    • Very high frequency: 17 GHz, 18 GHz, 24 GHz (ISM – Industrial, Scientific, and Medical bands), 26.5 GHz, 30 GHz, 35 GHz, 40 GHz, 50 GHz, 60 GHz (wireless communication and radar applications)
    • Millimeter wave: 75 GHz, 77 GHz (automotive radar systems), 94 GHz, 100 GHz, 110 GHz

    Our test laboratory is equipped to perform shielding effectiveness measurements up to 110 GHz.


    You can read more on the home page. If you are looking for a laboratory to test your product, you are in the right place – feel free to contact us by email or phone.


    Measurements are made according to customer specifications or in accordance with the main standards as below:

    ANSI/SCTE 48-3 ASTM D4935-18 ASTM D4935-99 ASTM F3057-14 BCA 20256462 CEI EN/IEC 50147-1 CEI EN/IEC 60512-23-3 CEI EN/IEC 61000-5-7 CEI EN/IEC 61587-3 DTRF150933 - ALSTOM Std IEEE 299 ITrW-2014.001 - SWISSCOM Std MIL-STD-188-125-2 MIL-STD-285 NSA 65-6 NSA 94-106 VG 95370-15 VG 95373-15 VG 95373-40


    shielding effectiveness test example with 2 antennas
    • GENERAL APPLICATION FIELDS
    Public / Industrial / Military
    Private / Residential
    Textiles
    • Shielded bags
    • Shielded shirts
    • Shielded card holders for RFID cards
    • Shielded pockets for jackets and shirts
    • Shielding fabrics for domestic environments against electromagnetic fields
    • Shielded suitcases for protection of sensitive devices or documents

    Construction
    • Shielding panels and sheets for private rooms, shielded enclosures, medical rooms, or small shelters

    Glass
    • Shielded glass for residential windows or interior partitions
    • Shielded glass for screens and small electronic devices

    Applicable Solutions
    • Custom shielding solutions on request
    • Shielding sprays for residential use
    • Shielding paints for indoor use

    Other Shielding Materials
    • Conductive films and shielding sheets for walls or domestic surfaces
    • Conductive gaskets and shielding foams for residential use
    • Shielding materials for IoT and consumer electronics
    • Shielding tapes for small devices or DIY applications
    • Shielding solutions for RFID cards and personal devices
    • Conductive paints and coatings for indoor applications
    • Not mentioned above

    Oversize Products
    • Oversize Products
    • Aircrafts and airplanes
    • Shielded electrical cabinets / enclosures
    • Shielded trucks
    • Vehicles with shielded components
    • Shielded containers
    • Freighters
    • Ships
    • Military shelters

    Buildings
    • Anechoic chambers
    • Professional shielded rooms
    • Complete buildings requiring shielding
    • Government buildings and security zones
    • Sensitive or restricted areas
    • Shielded rooms and technical environments
    • Medical shielded rooms

    Glass Applications
    • Shielded screens for industrial and medical equipment
    • Shielded glass with or without conductive mesh
    • Shielded glass for railway applications

    Applicable Solutions
    • Custom shielding solutions
    • Industrial or professional shielding sprays
    • Military-grade shielding paints

    Other Shielding Materials
    • Telecom and wireless networking equipment
    • RF absorbers and layered shielding materials for critical environments
    • Automotive control units compliant with ISO 11452, CISPR 25
    • Conductive plastic or composite components
    • Medical devices compliant with IEC 60601-1-2
    • Conductive films, sheets, and tapes for electronics and telecoms
    • Conductive gaskets and shielding foams for industrial or military installations
    • RFID shielding materials for logistics or industrial use
    • Conductive paints and coatings for industrial, military or technical applications
    • Not mentioned above

    shielding effectiveness graph
    CONTACT US
    For information regarding the shielding effectiveness test, or to get a quote, you can contact us by phone or write us an email.
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    E-mail: info@emctest.it   |     Phone: +39 0541 728562
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