Coupling network according to IEC 60255-26 for common mode tests

A voltage source used to generate the 300 V output shall be connected to the CN 60255-C black and blue terminal. IEC 60255-26 defines essential requirements for the interference immunity and interference emission of measuring relays and protective devices with regard to permanent and transient conducted and radiated interference, including electrostatic interference. Two coupling networks for common mode tests and differential mode tests are available for this purpose.