ASTM A341/A341M-00(2011)

    Standard Test Method for Direct Current Magnetic Properties of Materials Using D-C Permeameters and the Ballistic Test Methods

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    1. Scope

    1.1 This test method provides dc permeameter tests for the basic magnetic properties of materials in the form of bars, rods, wire, or strip specimens which may be cut, machined, or ground from cast, compacted, sintered, forged, extruded, rolled, or other fabricated materials. It includes tests for determination of the normal induction under symmetrically cyclically magnetized (SCM) conditions and the hysteresis loop (B-H loop) taken under conditions of rapidly changing or steep wavefront reversals of the direct current magnetic field strength.

    1.2 This test method shall be used in conjunction with Practice A34/A34M.

    1.3 This test method covers a range of magnetic field strength in the specimen from about 0.05 Oe [4 A/m] up to above 5000 Oe [400 kA/M] through the use of several permeameters. The separate permeameters cover this test region in several overlapping ranges.

    1.4 Normal induction and hysteresis properties may be determined over the flux density range from essentially zero to intrinsic saturation for most materials.

    1.5 Recommendations of the useful magnetic field strength range for each of the permeameters are shown in Table 1 . Also, see Sections 3 and 4 for general limitations relative to the use of permeameters.

    1.6 The symbols and abbreviated definitions used in this test method appear with Fig. 1 and in appropriate sections of this document. For the official definitions, see Terminology A340. Note that the term flux density used in this document is synonymous with the term magnetic induction.

    1.7 WarningMercury has been designated by EPA and many state agencies as a hazardous material that can cause central nervous system, kidney, and liver damage. Mercury, or its vapor, may be hazardous to health and corrosive to materials. Caution should be taken when handling mercury and mercury-containing products. See the applicable product Material Safety Data Sheet (MSDS) for details and EPAs website ( for additional information. Users should be aware that selling mercury or mercury-containing products, or both, in your state may be prohibited by state law.

    1.8 The values and equations stated in customary cgs-emu and inch-pound or SI units are to be regarded separately as standard. Within this standard, SI units are shown in brackets except for the sections concerning calculations where there are separate sections for the respective unit systems. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in nonconformance with this standard.

    1.9 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

    TABLE 1 Permeameters

    PermeameterUseful Magnetic Field Strength RangeAH Measuring
    Magnetizing Coil
    Babbit 40/10003.2/80I, HCyes yes(1,2)
    Burroughs0.1/3000.008/24Iyes yes(1,3,4,5)
    Fahy SimplexC0.1/300 0.008/24HCnono (1,4,5,6,7)
    Fahy Simplex
    Super H adapterC
    Full range0.05/14000.004/112HCyes yes(1,8)
    High H100/50008/400FCyesno(1,5,7,9)
    Iliovici0.5/500 0.04/400 I, HCyesyes (4,10,11)
    IEC Type A0.1/25000.008/200HC, HPnoyesIEC 60404-4
    IEC Type B0.1/6300.008/50RCCnonoIEC 60404-4
    Isthmus 100/20 000+ 8/1600+HC, HP nono(1,4,12,13)
    MH0.1/300 0.008/24 FCyesyes (1,6,14)
    NPL0.5/25000.04/200I, HCyesyes(15)
    Saturation100/40008/320HCno yes(5,16,17)

    A Although the permeameters are capable of being used at the lower end of the measurement range, the measurement accuracy is reduced.

    B Imagnetizing current; HCfixed H coil; FCflip coil; HPHall probe; RCCRogowski-Chattock coil.

    C Fahy permeameters require a standard of known magnetic properties for calibration of the H coil.

    A1Multirange ammeter (main current)
    A2Multirange ammeter (hysteresis current)
    BFlux density test position for Switch S3
    FElectronic Integrator
    HMagnetic field strength test position for Switch S3
    N1Magnetizing coil
    N2Flux sensing (B) coil
    N3Magnetic field strength sensing coil
    R1Main current control rheostat
    R2Hysteresis current control rheostat
    S1Reversing switch for magnetizing current
    S2Shunting switch for hysteresis current control rheostat
    S3Integrator selector switch

    FIG. 1 Basic Circuit Using Permeameter

    2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

    ASTM Standards

    A34/A34M Practice for Sampling and Procurement Testing of Magnetic Materials

    A340 Terminology of Symbols and Definitions Relating to Magnetic Testing

    A596/A596M Test Method for Direct-Current Magnetic Properties of Materials Using the Ballistic Method and Ring Specimens

    A977/A977M Test Method for Magnetic Properties of High-Coercivity Permanent Magnet Materials Using Hysteresigraphs

    IEC Standard

    Publication 60404-4,

    Other Documents

    NIST Circular No. 74, pg. 269 Available from National Institute of Standards and Technology (NIST), 100 Bureau Dr., Stop 1070, Gaithersburg, MD 20899-1070,

    ICS Code

    ICS Number Code 29.030 (Magnetic materials)

    UNSPSC Code

    UNSPSC Code 31381100(Castmagnets and magnet assemblies); 31381200(Sintered magnets and magnet assemblies)

    Referencing This Standard
    Link Here
    Link to Active (This link will always route to the current Active version of the standard.)

    DOI: 10.1520/A0341_A0341M-00R11

    Citation Format

    ASTM A341 / A341M-00(2011), Standard Test Method for Direct Current Magnetic Properties of Materials Using D-C Permeameters and the Ballistic Test Methods, ASTM International, West Conshohocken, PA, 2011,

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