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  • BS 5938-1:1984

    Current The latest, up-to-date edition.

    Cores for inductors and transformers for telecommunications Methods of measurement

    Available format(s):  Hardcopy, PDF

    Language(s):  English

    Published date:  31-10-1984

    Publisher:  British Standards Institution

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    Table of Contents - (Show below) - (Hide below)

    National foreword
    Committees responsible
    Section one - General
    1 Scope
    2 Object
    3 Environmental conditions
    4 General precautions for methods involving
        permeability measurements
    5 General precautions for loss measurement at low
        flux density
    6 Magnetic conditioning
    7 Inductance measurement
    Section two - Common measuring methods
    8 Disaccommodation
    9 Variation of permeability with temperature
    10 Range of inductance adjustment
    11 Losses
    Section three - Specialized measuring methods
    12 Third harmonic distortion
    13 Magnetic shock sensitivity
    14 Contribution of the adjusting device to the core
        instability
    15 Influence of a static magnetic field
    16 Magnetic properties under pulse conditions
    17 (Effective) Amplitude permeability
    Appendices
    A Apparatus for magnetic conditioning with capacitor
        discharge
    B Power amplifier for magnetic conditioning
    C Apparatus for magnetic conditioning based on the
        alternating field method
    D Thermal method for magnetic conditioning
    E Guide for the design of inductance measuring coils
        for newly developed types of cores
    F Methods of expressing temperature dependence
    G Damped oscillation method for loss measurement
        calibration
    H Transmission method for loss measurement calibration
    J Examples of circuits for measuring total core loss
    K Example of a circuit for measuring third harmonic
        distortion (low impedance method)
    L Methods of inductance measurement in the presence of
        a static magnetic field
    M Examples of circuits for pulse measurements
    N Examples of circuits for measuring (effective)
        amplitude permeability

    Abstract - (Show below) - (Hide below)

    Gives guidance on drafting those parts of specifications for magnetic cores concerned with measuring methods for magnetic and electrical properties of cores made primarily of magnetic oxides or metallic powders, and used in inductors and transformers for telecommunication and similar equipment.

    Scope - (Show below) - (Hide below)

    This standard applies to magnetic cores, mainly made of magnetic oxides or metallic powders, used in inductors and transformers for telecommunication equipment and electronic devices employing similar techniques.

    Some of the methods described in this standard may also be suitable for magnetic cores used in other components.

    General Product Information - (Show below) - (Hide below)

    Committee EPL/51
    Development Note Also numbered as IEC 60367-1 Supersedes 79/30812 DC, 79/29950 DC and 80/33077 DC (09/2005)
    Document Type Standard
    Publisher British Standards Institution
    Status Current
    Supersedes

    Standards Referenced By This Book - (Show below) - (Hide below)

    BS 9925-03.0:1988 Harmonized system of quality assessment for electronic components. Inductor and transformer cores for telecommunications Sectional specification: Magnetic oxide cores for transformers and chokes for power applications
    BS 9925-02.0:1987 Harmonized system of quality assessment for electronic components. Inductor and transformer cores for telecommunications Sectional specification: magnetic oxide cores for broad-band transformers
    BS 9925-0:1984 Harmonized system of quality assessment for electronic components. Inductor and transformer cores for telecommunications Generic specification
    BS 9720:1983 Specification for custom-built transformers and inductors of assessed quality: generic data and methods of test
    BS EN 60431:1997 Specification for dimensions of square cores (RM-cores) made of magnetic oxides and associated parts
    BS 9720:1989 Specification for custom-built transformers and inductors of assessed quality: generic data and methods of test
    BS 9925-03.01:1988 Harmonized system of quality assessment for electronic components. Inductor and transformer cores for telecommunications Blank detail specification: magnetic oxide cores for transformers and chokes for power applications. Assessment level A
    BS EN 125500:1996 Harmonized system of quality assessment for electronic components. Sectional specification: magnetic oxide ring cores for interference suppression and low level signal transformer applications
    BS 9925-01.0:1984 Harmonized system of quality assessment for electronic components. Inductor and transformer cores for telecommunications Sectional specification: magnetic oxide cores for inductor applications
    BS EN 125400:1993 Harmonized system of quality assessment for electronic components: sectional specification: adjusters used with magnetic oxide cores for use in inductors and tuned transformers
    BS CECC 25300:1981 Harmonized system of quality assessment for electronic components: sectional specification: magnetic oxide cores for power applications
    BS 9730:1986 Sectional specification for power transformers of assessed quality for switched mode power supplies (SMPS) for use in electronic equipment for capability approval

    Standards Referencing This Book - (Show below) - (Hide below)

    BS 2011-2.1A:1977 Environmental testing. Tests Tests A. Cold
    BS 2011-2.1B:1977 Environmental testing. Tests Tests B. Dry Heat
    BS 6454:1983 Method for calculation of the effective parameters of magnetic piece parts
    BS 4738-1:1971 Specification for enamelled copper conductors with an additional heat-bonding coating. Round wire
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