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The method of measurement of conducted interference from television (TV) and FM broadcast receivers is described by two current IRE Standards. These are "IRE Standards on Receivers: Methods of Measurement of Interference Output of Television Receivers in the Range of 300 to 10,000 KC, 1954" (Standard 54 IRE 17.S1l) and "IRE Standards on Methods of Measurement of the Conducted Interference Output of Broadcast and Television Receivers in the Range of 300 KC to 25 MC, 1956" (Standard 56 IRE 27.S12). In the measurement of conducted interference, it has been determined that the network formerly employed to deliver an RF input signal to the receiver under test has been responsible for some inconsistency. Accordingly, this Supplement is issued to describe a new procedure in which the old coupling network is replaced with a resistive pad having properties that are well defined and easily reproduced. The Standard 56 IRE 27.S1 represented an amendment to the earlier Standard 54 IRE 17.S1. The present supplement further modifies Standard 54 IRE 17.S1.