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


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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 laboratory that performs shielding effectiveness tests on site, directly to the customer, in Italy and in Europe, or at its headquarters in Rimini - Italy.

    We perform shielding effectiveness tests for several sectors:

    • private
    • industrial
    • medical
    • nautical
    • aviation
    • military
    • scientifical
    Typical shielding effectiveness measurement frequencies are: 10 kHz, 100 kHz, 1 MHz, 10 MHz, 30 MHz, 100 MHz, 500 MHz, 1 GHz, 10 GHz, 18 GHz, 26.5 GHz and 40 GHz.

    Our lab test can perform shielding effectiveness measurements up to 50 GHz.


    Read more about it going back to the home page. Or if you are looking for a lab in order to test your product contact us via email or by phone simply clicking here.


    Measurements are made according to customer specifications or in accordance with the main standards as below:
    shielding effectiveness test example with 2 antennas
    • GENERAL APPLICATION FIELDS
    Private / Residential
    Public / Industrial / Military
    Textile
    • Fabrics used to protect premises against electromagnetic fields
    • Realization of card holders
    • Jackets pockets
    • Shirts
    • Bags
    • Suitcases to protect RFID cards

    Construction
    • Shielding panels and sheets for the construction of shielded structures such as shelters, screened rooms, reserved rooms, medical rooms, etc.

    Glasses
    • Glasses to be applied to screens for small equipment
    • Glasses for the construction of shielding windows for buildings or internal dividing walls.

    Applicable solutions
    • Spray
    • Shielding paints

    Other shielding solutions
    • Not mentioned above

    Oversize Products
    • Oversize Products
    • Aircrafts
    • Ships
    • Freighters
    • Trucks
    • Cars
    • Military Shelter
    • Container
    • Electrical cabinets / Enclosures

    Constructions
    • Entire buildings
    • Rooms
    • Reserved places
    • Government premises
    • Medical facilities
    • Shielded chambers
    • Anechoic chambers

    Glasses
    • Shielded glasses
    • Equipment screens

    Applicable solutions
    • Spray for industrial use
    • Military shielding paints

    Other shielding solutions
    • 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.
    • Opening time: 9am to 6pm (UTC/GMT +01:00)
    E-mail: info@emctest.it   |     Phone: +39 0541 728562
    Or simply fill in the contact form below:

    Type below the number you read: 5339