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          This document describes equipment inspection and radio frequency (rf) electromagnetic field measurement procedures for evaluation of rf industrial, scientific, and medical (ISM) equipment installed in the user's facility. The term, ISM equipment, as used here, includes equipment that generates rf energy for purposes other than radio communications, to cause physical, chemical, or biological changes; for example, industrial heaters (dielectric and induction), medical diathermy, ultrasonic equipment, rf plasma devices, and rf stabilized welders. These procedures are designed to help ensure that the equipment does not interfere with radio communications, navigation, and other essential radio services. The engineer responsible for the measurements should take all reasonable precautions to ensure that the maximum emission from the ISM equipment under test (EUT) has been measured. Radio frequency field-strength measurements of installed ISM equipment may be required if any of the following conditions exist: 1) The emission from the EUT was not measured by the manufacturer. 2) Because of its size or special operating conditions, the EUT could not be tested before installation. 3) Installed ISM equipment is suspected of causing interference. 4) ISM equipment has been modified in a way that could affect its rf emissions. 5) As the equipment ages, there is a question about its continued compliance. 6) There is a question about the safety to nearby personnel because of the emissions from the equipment. Measurements should be made under the direction of an engineer skilled in making and interpreting rf field-strength measurements. These measurements are made after the equipment is installed and ready for use at its place of use, and after it has been inspected as described in 2.2. The measurement report should generally be kept on file for at least three years after new measurements are made or after the equipment is no longer in use. There are significant differences between the &quot;open field&quot; or anechoic chamber measurements common in electromagnetic compatibility (EMC) and electromagnetic interference (EMI) work and the on-site measurements of installed ISM equipment. Some of these differences are described below. 1) The measurement conditions are usually more difficult because of crowded measurement locations, reflections from surrounding walls and equipment, and signals from other sources. 2 2) It is reasonable to take advantage of the shielding provided by walls and other equipment located between the ISM Equipment Under Test (EUT) and the location at which field-strength information is required. While the effect of a single wall may be small, the total effect of other equipment and building structures may be significant. In any case, it is not necessary to make measurements in a way which eliminates the benefits of this shielding. Some equipment is designed to be operated in a shielded enclosure, either because of its own sensitivity to outside interference, or because of its emission characteristics. When measuring the emission from this equipment, take advantage of the attenuation of the enclosure by making the measurements outside the enclosure, with the equipment in its normal operating position. 3) Since the measurement equipment is disconnected, moved, and reconnected many times during a set of measurements, its calibration should be checked frequently. 4) ISM equipment may often be grouped for field-strength measurements, taking one set of measurements for the entire group. 5) Electromagnetic-emission measurements of installed ISM equipment are usually significantly less accurate than laboratory (open field or test chamber) measurements because of lack of control of the measurement environment.
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App\Twig\Components\ProductMostRecent {#98526
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[
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App\Twig\Components\ProductCard {#98631
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}

[
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App\Twig\Components\ProductState {#98658
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App\Twig\Components\ProductMostRecent {#98735
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    -confirmedAt: DateTime @811634400 {#97248
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    }
    -canceledAt: null
    -edition: null
    -coreDocument: "187"
    -bookCollection: ""
    -pageCount: 18
    -documents: Doctrine\ORM\PersistentCollection {#97252 …}
    -favorites: Doctrine\ORM\PersistentCollection {#97254 …}
  }
  +label: "Historical"
  +icon: "historical"
  -mostRecentAttributeCode: "most_recent"
  -localeContext: Sylius\Component\Locale\Context\CompositeLocaleContext {#1833 …}
}

[
  "product" => App\Entity\Product\Product {#97281
    #id: 8398
    #code: "IEEE00000408"
    #attributes: Doctrine\ORM\PersistentCollection {#97298 …}
    #variants: Doctrine\ORM\PersistentCollection {#97300 …}
    #options: Doctrine\ORM\PersistentCollection {#97304 …}
    #associations: Doctrine\ORM\PersistentCollection {#97302 …}
    #createdAt: DateTime @1751037383 {#97274
      date: 2025-06-27 17:16:23.0 Europe/Paris (+02:00)
    }
    #updatedAt: DateTime @1754606304 {#97275
      date: 2025-08-08 00:38:24.0 Europe/Paris (+02:00)
    }
    #enabled: true
    #translations: Doctrine\ORM\PersistentCollection {#97288 …}
    #translationsCache: [
      "en_US" => App\Entity\Product\ProductTranslation {#98860
        #locale: "en_US"
        #translatable: App\Entity\Product\Product {#97281}
        #id: 28601
        #name: "IEEE 213:1987 (R1998)"
        #slug: "ieee-213-1987-r1998-ieee00000408-240050"
        #description: """
          Revision Standard - Inactive-Withdrawn.<br />\n
          Procedures for testing television and FM broadcast receivers are included. The user is cautioned that this method might not be appropriate for conducted emissions testing of systems or products other than televisions or FM receivers. Other more general methods exist and it is suggested that they be used for review. These include, but are not limited to, ANSI C63.4-1981, American National Standard Methods of Measurement of Radio Noise Emissions from Low-Voltage Electrical and Electronic Equipment in the Range of 10 kHz to 1 GHz. A method for measuring the emissions conducted by the power line from these receivers in the frequency range of 300 kHz to 25 MHz is defined. Standard input signals, the equipment setup, and measurement techniques are described.<br />\n
          \t\t\t\t
          """
        #metaKeywords: null
        #metaDescription: null
        #shortDescription: "IEEE Standard Procedure for Measuring Conducted Emissions in the Range of 300 kHz to 25 MHz from Television and FM Broadcast Receivers to Power Lines"
        -notes: "Inactive-Withdrawn"
      }
    ]
    #currentLocale: "en_US"
    #currentTranslation: null
    #fallbackLocale: "en_US"
    #variantSelectionMethod: "match"
    #productTaxons: Doctrine\ORM\PersistentCollection {#97290 …}
    #channels: Doctrine\ORM\PersistentCollection {#97296 …}
    #mainTaxon: App\Entity\Taxonomy\Taxon {#9353 …}
    #reviews: Doctrine\ORM\PersistentCollection {#97292 …}
    #averageRating: 0.0
    #images: Doctrine\ORM\PersistentCollection {#97294 …}
    -supplier: Proxies\__CG__\App\Entity\Supplier\Supplier {#97178 …}
    -subscriptionCollections: Doctrine\ORM\PersistentCollection {#97282 …}
    -apiLastModifiedAt: DateTime @1754517600 {#97276
      date: 2025-08-07 00:00:00.0 Europe/Paris (+02:00)
    }
    -lastUpdatedAt: DateTime @1578006000 {#97277
      date: 2020-01-03 00:00:00.0 Europe/Paris (+01:00)
    }
    -author: ""
    -publishedAt: DateTime @588981600 {#97278
      date: 1988-08-31 00:00:00.0 Europe/Paris (+02:00)
    }
    -releasedAt: null
    -confirmedAt: DateTime @898725600 {#97279
      date: 1998-06-25 00:00:00.0 Europe/Paris (+02:00)
    }
    -canceledAt: DateTime @1074207600 {#97280
      date: 2004-01-16 00:00:00.0 Europe/Paris (+01:00)
    }
    -edition: null
    -coreDocument: "213"
    -bookCollection: ""
    -pageCount: 23
    -documents: Doctrine\ORM\PersistentCollection {#97284 …}
    -favorites: Doctrine\ORM\PersistentCollection {#97286 …}
  }
  "layout" => "vertical"
  "showPrice" => true
  "showStatusBadges" => true
  "imageFilter" => "product_listing_thumbnail"
  "additionalClasses" => "h-100 border-0"
  "hasStretchedLink" => true
  "backgroundColor" => "secondary-lighter"
  "hoverType" => "border-black"
]

App\Twig\Components\ProductCard {#98840
  +product: App\Entity\Product\Product {#97281
    #id: 8398
    #code: "IEEE00000408"
    #attributes: Doctrine\ORM\PersistentCollection {#97298 …}
    #variants: Doctrine\ORM\PersistentCollection {#97300 …}
    #options: Doctrine\ORM\PersistentCollection {#97304 …}
    #associations: Doctrine\ORM\PersistentCollection {#97302 …}
    #createdAt: DateTime @1751037383 {#97274
      date: 2025-06-27 17:16:23.0 Europe/Paris (+02:00)
    }
    #updatedAt: DateTime @1754606304 {#97275
      date: 2025-08-08 00:38:24.0 Europe/Paris (+02:00)
    }
    #enabled: true
    #translations: Doctrine\ORM\PersistentCollection {#97288 …}
    #translationsCache: [
      "en_US" => App\Entity\Product\ProductTranslation {#98860
        #locale: "en_US"
        #translatable: App\Entity\Product\Product {#97281}
        #id: 28601
        #name: "IEEE 213:1987 (R1998)"
        #slug: "ieee-213-1987-r1998-ieee00000408-240050"
        #description: """
          Revision Standard - Inactive-Withdrawn.<br />\n
          Procedures for testing television and FM broadcast receivers are included. The user is cautioned that this method might not be appropriate for conducted emissions testing of systems or products other than televisions or FM receivers. Other more general methods exist and it is suggested that they be used for review. These include, but are not limited to, ANSI C63.4-1981, American National Standard Methods of Measurement of Radio Noise Emissions from Low-Voltage Electrical and Electronic Equipment in the Range of 10 kHz to 1 GHz. A method for measuring the emissions conducted by the power line from these receivers in the frequency range of 300 kHz to 25 MHz is defined. Standard input signals, the equipment setup, and measurement techniques are described.<br />\n
          \t\t\t\t
          """
        #metaKeywords: null
        #metaDescription: null
        #shortDescription: "IEEE Standard Procedure for Measuring Conducted Emissions in the Range of 300 kHz to 25 MHz from Television and FM Broadcast Receivers to Power Lines"
        -notes: "Inactive-Withdrawn"
      }
    ]
    #currentLocale: "en_US"
    #currentTranslation: null
    #fallbackLocale: "en_US"
    #variantSelectionMethod: "match"
    #productTaxons: Doctrine\ORM\PersistentCollection {#97290 …}
    #channels: Doctrine\ORM\PersistentCollection {#97296 …}
    #mainTaxon: App\Entity\Taxonomy\Taxon {#9353 …}
    #reviews: Doctrine\ORM\PersistentCollection {#97292 …}
    #averageRating: 0.0
    #images: Doctrine\ORM\PersistentCollection {#97294 …}
    -supplier: Proxies\__CG__\App\Entity\Supplier\Supplier {#97178 …}
    -subscriptionCollections: Doctrine\ORM\PersistentCollection {#97282 …}
    -apiLastModifiedAt: DateTime @1754517600 {#97276
      date: 2025-08-07 00:00:00.0 Europe/Paris (+02:00)
    }
    -lastUpdatedAt: DateTime @1578006000 {#97277
      date: 2020-01-03 00:00:00.0 Europe/Paris (+01:00)
    }
    -author: ""
    -publishedAt: DateTime @588981600 {#97278
      date: 1988-08-31 00:00:00.0 Europe/Paris (+02:00)
    }
    -releasedAt: null
    -confirmedAt: DateTime @898725600 {#97279
      date: 1998-06-25 00:00:00.0 Europe/Paris (+02:00)
    }
    -canceledAt: DateTime @1074207600 {#97280
      date: 2004-01-16 00:00:00.0 Europe/Paris (+01:00)
    }
    -edition: null
    -coreDocument: "213"
    -bookCollection: ""
    -pageCount: 23
    -documents: Doctrine\ORM\PersistentCollection {#97284 …}
    -favorites: Doctrine\ORM\PersistentCollection {#97286 …}
  }
  +layout: "vertical"
  +showPrice: true
  +showStatusBadges: true
  +additionalClasses: "h-100 border-0"
  +linkLabel: ""
  +imageFilter: "product_listing_thumbnail"
  +hasStretchedLink: true
  +backgroundColor: "secondary-lighter"
  +hoverType: "border-black"
}