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IEC 61326-1-2020 Electrical equipment for measurement, control and laboratory use – EMC requirements – Part 1: General requirements. Equipment and systems within the scope of this document can be subjected to various kinds of electromagnetic disturbances, sources of which include power, measurement or control lines or those radiated from the environment. The types and levels of disturbances depend on the particular conditions in which the systems, subsystems or equipment are installed and operated. Equipment within the scope of this document can also be a source of electromagnetic disturbances over a wide frequency range. These disturbances can be conducted through power and signal lines, or be directly radiated, and can affect the performance of other equipment, or influence the external electromagnetic environment. For emissions, the objective of the requirements given in this document is to ensure that the disturbances generated by the equipment and systems, when operated normally, do not exceed a level which could prevent other systems from operating as intended. The emission limits are considered in 7.2. NOTE 1 Higher immunity levels than those specified can be necessary for particular applications (for example, when reliable operation of the equipment is essential for safety) or when the equipment is intended for use in harsher electromagnetic environments. Also, additional tests and different performance criteria can be necessary for particular applications. NOTE 2 In special cases, for example when highly susceptible equipment is being used near the EUT, additional mitigation measures could have to be employed to reduce the influencing electromagnetic emission further below the specified limits. The manufacturer may select to perform all tests on either a single EUT or divide the tests among multiple EUTs. If the latter, each test result shall be traceable to the EUT tested. The testing sequence is optional. 5 EMC test plan 5.1 General An EMC test plan shall be established prior to testing. At a minimum, it shall contain the elements defined in 5.2 to 5.5. It may be determined from consideration of the electrical characteristics and usage of a particular item of equipment that some tests are inappropriate and therefore unnecessary. In such cases, the decision not to test shall be recorded in the EMC test plan. 5.2 Configuration of EUT during testing 5.2.1 General Measurement, control and LABORATORY equipment often consists of systems with no fixed configuration. The kind, number and installation of different subassemblies within the equip- ment may vary from...

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