1、 IEC 60738-1Edition 3.1 2009-07INTERNATIONAL STANDARD Thermistors Directly heated positive temperature coefficient Part 1:Generic specification IEC 60738-1:2006+A1:2009(E)QC 440000 LICENSED TO MECON Limited.-RANCHI/BANGALORE,FOR INTERNAL USE AT THIS LOCATION ONLY,SUPPLIED BY BOOK SUPPLY BUREAU.THIS
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9、3 00 LICENSED TO MECON Limited.-RANCHI/BANGALORE,FOR INTERNAL USE AT THIS LOCATION ONLY,SUPPLIED BY BOOK SUPPLY BUREAU.IEC 60738-1Edition 3.1 2009-07INTERNATIONAL STANDARD Thermistors Directly heated positive temperature coefficient Part 1:Generic specification INTERNATIONAL ELECTROTECHNICAL COMMISS
10、ION CKICS 31.040.30 PRICE CODEISBN 2-8318-1048-7QC 440000 Registered trademark of the International Electrotechnical Commission LICENSED TO MECON Limited.-RANCHI/BANGALORE,FOR INTERNAL USE AT THIS LOCATION ONLY,SUPPLIED BY BOOK SUPPLY BUREAU.2 60738-1 IEC:2006+A1:2009(E)CONTENTS FOREWORD.5 1 Scope.7
11、 2 Normative references.7 3 Terms and definitions.8 4 Units and symbols.16 5 Preferred values.17 5.1 Climatic categories.17 5.2 Marking.17 5.3 Spacings.18 6 Quality assessment procedures.18 6.1 General.18 6.2 Primary stage of manufacture.19 6.3 Subcontracting.19 6.4 Structurally similar components.1
12、9 6.5 Qualification approval procedures.20 6.6 Rework and repair.27 6.7 Release for delivery.27 6.8 Certified test records of released lots.28 6.9 Delayed delivery.28 6.10 Alternative test methods.28 6.11 Manufacture outside the geographical limits of IECQ NSIs.28 6.12 Unchecked parameters.28 7 Test
13、 and measurement procedures.28 7.1 General.28 7.2 Standard conditions for testing.29 7.3 Drying and recovery.29 7.4 Visual examination and check of dimensions.30 7.5 Zero-power resistance.30 7.6 Temperature coefficient of resistance.31 7.7 Insulation resistance(for insulated types only).31 7.8 Volta
14、ge proof(for insulated types only).32 7.9 Resistance/temperature characteristic.32 7.10 Dissipation factor at Umax().33 7.11 Response time by ambient temperature change(ta).34 7.12 Response time by power change(tp).34 7.13 Thermal time constant by ambient temperature change(a).35 7.14 Thermal time c
15、onstant by cooling(c).35 7.15 Robustness of terminations.37 7.16 Solderability.38 7.17 Resistance to soldering heat.39 7.18 Rapid change of temperature.40 7.19 Vibration.40 7.20 Bump.40 7.21 Shock.41 LICENSED TO MECON Limited.-RANCHI/BANGALORE,FOR INTERNAL USE AT THIS LOCATION ONLY,SUPPLIED BY BOOK
16、SUPPLY BUREAU.60738-1 IEC:2006+A1:2009(E)3 7.22 Climatic sequence.41 7.23 Damp heat,steady state.42 7.24 Endurance.43 7.25 Tripping current and tripping time.47 7.26 Non-tripping current.47 7.27 Residual current.47 7.28 Surface temperature.48 7.29 Inrush current.49 7.30 Mounting(for surface mount thermistors only).49 7.31 Shear(adhesion)test.50 7.32 Substrate bending test.51 Annex A(normative)Interpretation of sampling plans and procedures as described in IEC 60410 for use within the IEC quality
