适用于A3级操作的所有变送器。也适用于A3A、A3B、A3H和A3J类操作的具有1、2、3或4个信道的无线电话发射机，以及用于单声道声音广播的调频发射机。部分适用于A7A和A7B类操作的变送器。 IEC 60244-4本身描述了标准操作条件、标准调制输入安排和频率（第一节）。它还描述了用于测量输入阻抗、振幅/频率特性和可理解串扰的标准方法（第二节）。

Applies to all transmitters for A3 class of operation. Applies also to radiotelephony transmitters with 1, 2, 3 or 4 channels for A3A, A3B, A3H and A3J class of operation, and to frequency modulated transmitters for monophonic sound broadcasting. Applies in part to transmitters for A7A and A7B class of operation. IEC 60244-4 itself describes standard operating conditions, standard modulation input arrangements and frequencies (Section One). It also describes standard methods to be used for measuring input impedance, the amplitude/frequency characteristics and the intelligible crosstalk (Section Two).