本指南适用于变压器套管的介损频域光谱（FDS）测量。

This document provides guidelines for performing a bushing dielectric frequency response (DFR) measurement either in the field or in the factory. The measurement technique, measuring equipment requirement, and interpretation of results based on comparison are included in the normative text. Additional theories related to DFR such as temperature correction using the Arrhenius equation, influence of voltage, and a few case studies are described in the annexes.