IEC 62236-4-2018 pdf free.Railway applications – Electromagnetic compatibility Part 4: Emission and immunity of the signalling and telecommunications apparatus.
The variety and diversity of the apparatus within the scope of this document makes it difficultto define precise criteria for the evaluation of the immunity test results.Three general levelsof performance are therefore used, as defined in lEC 62236-1.
6.2 lmmunity requirements
The immunity requirements for apparatus covered by this document are given on a port byport basis.
Test requirements are specified for each port considered.
Tests shall be conducted in a well-defined and reproducible manner. The tests shall becarried out as single tests in sequence.The sequence of testing is optional.The descriptionof the test,the test generator,the test methods and the test set-up are given in the basicstandards referred to in Tables 2 to 6.
lf the apparatus has a large number of similar ports or ports with many similar connections,then a sufficient number shall be selected to simulate actual operating conditions and toensure that all the different types of termination are covered (e.g.20 % of the ports or at leastfour ports).
The immunity levels given for the apparatus will in most cases allow the apparatus to performas intended inside the railway environment. The immunity level establishes a commonreference for evaluating the performance of the apparatus when subject to interferenceresulting from direct exposure of the apparatus and associated cables to a radio frequencyfield, or by coupling of the interference from a remote source.
The contents of the basic standards are not repeated herein; however, additional informationneeded for the practical application of the tests is given where appropriate.
Voltages induced by traction currents are not treated herein.They have to be covered by thefunctional specification.
Apparatus which complies with the radiated and conducted emission levels of lEC 61000-6-4is deemed to meet the emission requirements of this document,provided that the conductedemissions from any DC power port are within the emissions limits specified for AC powerports.
The emissions limits defined in Table 1 shall be complied with.The conducted emission limitsshall apply to both AC and DC power ports.Where the apparatus is intended to be used in anenvironment other than the railway environment,then the emission limits given in theappropriate standards shall apply.IEC 62236-4 pdf download.