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	BS EN 55024:1998 CISPR 24:1997 Information technology equipment - Immunity characteristics - Limits and methods of measurement Buy BSI Collections Online subscriptions to multiple documents on various subjects Info To speak with an IHS Subject Matter Expert call 1-888-752-0334, outside the US/Canada call 303-397-2892. More Top BSI Standards...

BS EN 55024:1998 CISPR 24:1997 - Information technology equipment - Immunity characteristics - Limits and methods of measurement

Introduction
This CISPR publication establishes uniform requirements for the electromagnetic immunity of information technology equipment. The test methods are given in the referenced Basic EMC Immunity Standards. This publication specifies applicable tests, test levels, product operating conditions and assessment criteria.

Scope and object
This CISPR publication applies to information technology equipment (ITE) as defined in CISPR 22. Harmonized standards prepared by ETSI, which cover the immunity requirements for telecommunications network equipment take precedence over this standard.

Procedures are defined for the measurement of ITE and limits are specified which are developed for ITE and within the frequency range from 0 Hz to 400 GHz.

The object of this publication is to establish requirements which will provide an adequate level of intrinsic immunity so that the equipment will operate as intended in its environment. For exceptional environmental conditions, special mitigation measures may be required. Owing to testing and performance assessment considerations, some tests are specified in defined frequency bands or at selected frequencies. Equipment which fulfils the requirements at these frequencies is deemed to fulfil the requirements in the entire frequency range from 0 Hz to 400 GHz for electromagnetic phenomena.

The object of this publication is to define the immunity test requirements for equipment defined in the scope in relation to continuous and transient, conducted and radiated disturbances, including electrostatic discharges (ESD).

The test requirements are specified for each port considered.

NOTE 1 Safety considerations are not covered in this publication.

NOTE 2 In special cases, situations will arise where the level of disturbance may exceed the levels specified in this publication, for example where a hand-held transmitter is used in proximity to an equipment. In these instances special mitigation measures may have to be employed.

Normative references
The following normative documents contain provisions which, through reference in this text, constitute provisions of this International Standard. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However, parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the publication referred to applies. Members of ISO and IEC maintain registers of currently valid International Standards.

• IEC 60050(161):1990, International Electrotechnical Vocabulary (IEV) - Chapter 161: Electromagnetic compatibility.
• IEC 60318:1970, An IEC artificial ear, of the wideband type, for the calibration of earphones used in audiometry.
• IEC 61000-4-2:1995, Electromagnetic compatibility (EMC) - Part 4: Testing and measurement techniques - Section 2: Electrostatic discharge immunity test - Basic EMC Publication.
• IEC 61000-4-3:1995, Electromagnetic compatibility (EMC) - Part 4: Testing and measurement techniques - Section 3: Radiated, radio-frequency, electromagnetic field immunity test - Basic EMC Publication.
• IEC 61000-4-4:1995, Electromagnetic compatibility (EMC) - Part 4: Testing and measurement techniques - Section 4: Electrical fast transient/burst immunity test - Basic EMC Publication.
• IEC 61000-4-5:1995, Electromagnetic compatibility (EMC) - Part 4: Testing and measurement techniques - Section 5: Surge immunity tests - Basic EMC Standard.
• IEC 61000-4-6:1996, Electromagnetic compatibility (EMC) - Part 4: Testing and measurement techniques - Section 6: Immunity to conducted disturbances, induced by radio-frequency fields.
• IEC 61000-4-8:1993, Electromagnetic compatibility (EMC) - Part 4: Testing and measurement techniques - Section 8: Power frequency magnetic field immunity test. techniques - Section 11: Voltage dips, short interruptions and voltage variations immunity tests.
• CISPR 20:2002, Sound and television broadcast receivers and associated equipment - Immunity characteristics - Limits and methods of measurement.$
• CISPR 22:1997, Information technology equipment - Radio disturbance characteristics - Limits and methods of measurement.
• ISO 9241-3:1992, Ergonomic requirements for office work with visual display terminals (VDTs) - Part 3: Visual display requirements.
• ITU-T Recommendation I.241.1, Telephony.
• ITU-T Recommendation I.411, Integrated service digital network (ISDN) user network interfaces.