1、 IEC/TR 62797 Edition 1.0 2013-08 TECHNICAL REPORT International comparison of measurements of the magnetic moment using vibrating sample magnetometers(VSM)and superconducting quantum interference device(SQUID)magnetometers IEC/TR 62797:2013(E)colourinsideCopyrighted material licensed to BR Demo by
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10、permitted.Uncontrolled when printed.IEC/TR 62797 Edition 1.0 2013-08 TECHNICAL REPORT International comparison of measurements of the magnetic moment using vibrating sample magnetometers(VSM)and superconducting quantum interference device(SQUID)magnetometers INTERNATIONAL ELECTROTECHNICAL COMMISSION
11、 V ICS 29.030 PRICE CODE ISBN 978-2-8322-1018-5 Registered trademark of the International Electrotechnical Commission Warning!Make sure that you obtained this publication from an authorized distributor.colourinsideCopyrighted material licensed to BR Demo by Thomson Reuters(Scientific),Inc.,downloade
12、d on Nov-27-2014 by James Madison.No further reproduction or distribution is permitted.Uncontrolled when printed.2 TR 62797 IEC:2013(E)CONTENTS FOREWORD.4 INTRODUCTION.6 1 Scope.7 2 Overview.7 3 Samples.8 3.1 Hard ferrites.8 3.2 Magnetic tapes.8 4 Measuring quantities and measuring conditions.8 4.1
13、General.8 4.2 Hard ferrite spheres.8 4.3 Magnetic tape samples.9 4.4 Role of the measuring temperature.9 5 Analysis of the measured quantities.10 Annex A(informative)International comparison of measurements of the magnetic moment using vibrating sample magnetometers and SQUID magnetometers.15 Annex
14、B(informative)Participants.30 Bibliography.31 Figure 1 Isotropic and anisotropic ferrites:standard deviations.12 Figure 2 Magnetic tape samples:standard deviations.12 Figure 3 Isotropic and anisotropic ferrites:weighted uncertainties.13 Figure 4 Magnetic tape samples:weighted uncertainties.13 Figure
15、 5 Normalized best values=of the N laboratories best estimates.The second is the weighted mean value y,which is generally preferred when dealing with a range of individual measuring uncertainties,as is usually the case with intercomparisons.It is defined as =NiicNiiciyuyuyy1212)(1)(1)where)(2icyu is
16、 the combined(1)variance of the i-th best estimate.The weighted variance is in turn given by the equation =Niiccyuyu122)(1)(1(2)One important point in analyzing and comparing the results from different sources regards the identification of outliers,which could lead to invalid conclusions regarding the reference values and the related uncertainty.An objective rule can be devised for their identification,which consists in calculating the normalized error 2ref2irefiniUUyyE+=(3)where yyref,Ui=kuc
