本文件中提出的建议主要用于获取远场噪声数据。应适当配置和操作试验发动机，以便获得的声压级与试验的具体目标一致。数据简化系统的主要输出是三分之一倍频程声压级。然而，在适当的情况下，可以出于更宽或更窄带宽分析的目的记录数据。

Recommendations presented in this document are intended primarily for the acquisition of far-field noise data. The test engine is to be appropriately configured and operated so that the sound pressure levels obtained are consistent with the specific objectives of the test. The principal output of the data reduction system is one-third octave band sound pressure levels. However, when appropriate, data may be recorded for purposes of broader or narrower bandwidth analysis.