Detail of GB 9254-2008

Introduction of GB 9254-2008

1 Scope This standard applies to Information Technology Equipment (ITE) as defined in 3.1. Procedures are given for the measurement of the levels of spurious signals generated by the ITE and limits are specified for the frequency range 9 kHz to 400 GHz for both class A and class B equipment. No measurements need be performed at frequencies where no limits are specified. The intention of this publication is to establish uniform requirements for the radio disturbance level of the equipment contained in the scope, to fix limits of disturbance, to describe methods of measurement and to standardize operating conditions and interpretation of results. 2 Normative References The following standards contain provisions which, through reference in this text, constitute provisions of this standard. For dated reference, subsequent amendments to (excluding correction to), or revisions of, any of these publications do not apply. However, the parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the standards. For undated references, the latest edition of the normative document referred to applies. GB 1002-1996 Single Phase Plugs and Socket-outlets for Household and Similar Purposes - Types, Basic Parameters and Dimensions GB/T 17626.6-2008 Electromagnetic Compatibility - Testing and Measurement Techniques - Immunity to Conducted Disturbances, Induced by Radio-frequency Fields (IEC61000-4-6: 2006, IDT) GB 4824-2004 Industrial, Scientific, and Medical (ISM) Radio-frequency Equipment - Electromagnetic Disturbance Characteristics - Limits and Methods of Measurement (CISPR11: 2003, IDT) GB 13837-2003 Sound and Television Broadcast Receivers and Associated Equipment - Radio Disturbance Characteristics - Limits and Methods of Measurement (CISPR13: 2001, MOD) GB/T 6113.101-2008 Specification for Radio Disturbance and Immunity Measuring Apparatus and Methods - Part 1-1: Radio Disturbance and Immunity Measuring Apparatus - Measuring Apparatus (CISPR 16-1-1: 2006, IDT) GB/T 6113.102-2008 Specification for Radio Disturbance and Immunity Measuring Apparatus and Methods - Part 1-2: Radio Disturbance and Immunity Measuring Apparatus - Ancillary Equipment - Conducted Disturbances (CISPR16-1-2: 2006, IDT) GB/T 6113. 104-2008 Specification for Radio Disturbance and Immunity Measuring Apparatus and Methods - Part 1-4: Radio Disturbance and Immunity Measuring Apparatus - Ancillary Equipment - Radiated Disturbances (CISPR16-1-4: 2005. IDT) GB/T 6113.203-2008 Specification for Radio Disturbance and Immunity Measuring Apparatus and Methods - Part 2-3: Methods of Measurement of Disturbances and Immunity - Radiated Disturbance Measurements (CISPR16-2-3: 2003, IDT) GB/T 6113.402-2006 Specification for Radio Disturbance and Immunity Measuring Apparatus and Methods - Part 4-2: Uncertainties, Statistics and Limit Modeling - Uncertainty in EMC Measurements (CISPR16-4-2, 2003, IDT) CISPR16-1-1:2003 Specification for Radio Disturbance and Immunity Measuring Apparatus and Methods - Part 1-1: Radio Disturbance and Immunity Measuring Apparatus - Measuring Apparatus CISPR16-1-4:2007 Specification for Radio Disturbance and Immunity Measuring Apparatus and Methods - Part 1-4: Radio Disturbance and Immunity Measuring Apparatus - Ancillary Equipment - Radiated Disturbances 3 Definitions For the purposes of this document the following definitions apply: 3.1 information technology equipment ITE any equipment: a) which has a primary function of either (or a combination of) entry, storage, display, retrieval, transmission, processing, switching, or control, of data and of telecommunication messages and which may be equipped with one or more terminal ports typically operated for information transfer; b) with a rated supply voltage not exceeding 600V It includes, for example, data processing equipment, office machines, electronic business equipment and telecommunication equipment. Any equipment (or part of the ITE equipment) which has a primary function of radio transmission and/or reception according to the ITU Radio Regulations are excluded from the scope of this standard. Note: Any equipment which has a function of radio transmission and/or reception according to the definitions of the ITU Radio Regulations shall fulfill the national radio regulations, whether or not this standard is also valid. Equipment, for which all disturbance requirements in the frequency range are explicitly formulated in relevant national standards, are excluded from the scope of this standard. 3.2 equipment under test EUT representative ITE or functionally interactive group of ITE (system) which includes one or more host unit(s) and is used for evaluation purposes 3.3 host unit part of an ITE system or unit that provides the mechanical housing for modules, which may contain radio-frequency sources, and may provide power distribution to other ITE. Power distribution may be a.c., d.c., or both between the host unit(s) and modules or other ITE 3.4 module part of an ITE which provides a function and may contain radio-frequency sources 3.5 identical modules and ITE modules and ITE produced in quantity and within normal manufacturing tolerances to a given manufacturing specification

Contents of GB 9254-2008

Foreword i Introduction iv 1 Scope 2 Normative References 3 Definitions 4 Classification of ITE 4.1 Class B ITE 4.2 Class A ITE 5 Limits for Conducted Disturbance at Mains Terminals and Telecommunication Ports 5.1 Limits of Mains Terminal Disturbance Voltage 5.2 Limits of Conducted Common Mode Disturbance at Telecommunication Ports 6 Limits for Radiated Disturbance 6.1 Limits Below 1 GHz 6.2 Limits Above 1GHz 7 Interpretation of CISPR Radio Disturbance Limit 7.1 Significance of a CISPR Limit 7.2 Application of Limits in Tests for Conformity of Equipment in Series Production 8 General Measurement Conditions 8.1 Ambient Level 8.2 General Requirements for EUT Configuration 8.3 EUT Arrangement 8.4 Operational Mode of the EUT 9 Method of Measurement of Conducted Disturbance at Mains Terminals and Telecommunication Ports 9.1 Measurement Detectors 9.2 Measuring Receivers 9.3 Artificial Mains Network (AMN) 9.4 Ground Reference Plane 9.5 EUT Arrangement 9.6 Measurement of Disturbances at Telecommunication Ports 9.7 Recording of Measurements 10 Method of Measurement of Radiated Disturbance 10.1 Measurement Detectors 10.2 Measuring Receiver Below 1 GHz 10.3 Antenna Below 1 GHz 10.4 Measurement Site Below 1 GHz 10.5 EUT Arrangement Below 1 GHz 10.6 Radiated Emission Measurements Above 1 GHz 10.7 Recording of Measurements 10.8 Measurement in the Presence of High Ambient Signals 10.9 User Installation Testing 11 Measurement Uncertainty Annex A (Normative) Site Attenuation Measurements of Alternative Test Sites Annex B (Normative) Decision Tree for Peak Detector Measurements Annex C (Normative) Possible Test Set-ups and Test Methods for Common Mode Measurements Annex D (Informative) Schematic Diagrams of Examples of Impedance Stabilization Networks (ISN) Annex E (Informative) Parameters of Signals at Telecommunication Ports Annex F (Informative) Rationale for Disturbance Measurements and Methods on Telecommunications Ports Annex G (Informative) Operational Modes for Some Types of ITE Bibliography