JJF 1680-2017 in English

This document provides detailed procedures and requirements for the calibration of directional couplers and voltage standing wave ratio bridges. It outlines the necessary equipment, environmental conditions, and methods to ensure accurate and consistent measurement results. The scope includes the definition of calibration items, the selection of reference standards, and the steps involved in performing the calibration process. It also specifies the requirements for recording and reporting calibration data. The document is intended to be used by technical personnel involved in the calibration and verification of these devices, ensuring compliance with established metrological standards. The content is structured to facilitate understanding and application by professionals in the field of measurement and testing.