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GJB 151C is the current edition of the Chinese national military standard for the electromagnetic emission and susceptibility requirements of military equipment and subsystems, issued in January 2025 with effect from March 2025 and replacing the previous edition. It retains the structure of its predecessor, in which twenty-one numbered test items are grouped into conducted emission, conducted susceptibility, radiated emission and radiated susceptibility, and it gives the limit or the applied level, the frequency range, the test set-up and the measurement procedure for each. The most significant addition is the conducted susceptibility item CS117, which addresses the transients induced in aircraft and equipment cable runs by a lightning strike and which brings the standard into line with the corresponding requirement in the United States military standard. Because the edition changes the applicable test programme, equipment qualified under the earlier edition must be reassessed against the items that have been added or modified.

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