本测试程序取代了上一期《天线标准——48 I R E 2S2测试方法》，涉及天线特性的测量。在第1.2节中，定义了本试验程序中使用的符号和单位。第1.3节讨论了环境对天线及其特性的影响，并提出了测量期间应采取的某些预防措施。在第1.4节中，引用了互易定理在天线测量中的实用性，以及该定理不适用的情况示例。

This Test Procedure, which supersedes the previous issue, Standards on Antennas--Methods of Testing 48 I R E 2S2, is concerned with measurements of the properties which characterize antennas. In Section 1.2, symbols and units to be used in this test Procedure are defined. The effect of the environment on the antenna and its characteristics is discussed in Section 1.3, and certain precautions to be taken during the measurements are suggested. In Section 1.4, the usefulness of the reciprocity theorem in antenna measurements is cited, along with examples of situations in which this theorem does not apply.