IEC 55024 Information Technology Equipment – Immunity Characteristics – Limits and Methods of Measurement
IEC 55024 testing is also referred to as CISPR 24 testing. The CISPR 24 publication applies to information technology equipment (ITE) as defined in CISPR 22.
The object of IEC 55024 EMC testing is to establish requirements that will provide an adequate level of intrinsic immunity. This is required so that the equipment will operate as intended in its environment. The CISPR-24 test standard defines the immunity test requirements for equipment within its scope in relation to continuous and transient conducted and radiated disturbances. This includes electrostatic discharges (ESD).
Procedures are defined for the measurement of ITE and limits are specified which are developed for ITE. These apply to devices operating within the frequency range from 0 Hz to 400 GHz.
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. IEC 55024 states that 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. This is for electromagnetic phenomena. The test requirements are specified for each port considered.
Information technology equipment (ITE) is defined by CISPR 24 as equipment meeting one of the following criteria. First, any equipment 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. This equipment may be equipped with one or more terminal ports typically operated for information transfer.
In addition to those criteria, the equipment must have a rated supply voltage not exceeding 600 V. This includes, for example, data processing equipment, office machines, electronic business equipment and telecommunication equipment.
Please note that 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 CISPR-24 lab testing. Also, equipment, for which all disturbance requirements in the frequency range are explicitly formulated in other IEC or CISPR publications, are excluded from the scope of testing to IEC 55024.
The term equipment under test or EUT is defined in CISPR-24 as the representative device or functionally interactive group of devices (that is a system) which includes one or more host units that is subjected to test procedures specified in IEC 55024 lab testing.
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