JJF 1925-2021 in English

This standard provides detailed guidelines for the calibration of low-frequency voltmeters. It outlines the procedures, conditions, and requirements necessary to ensure accurate and consistent measurements. The document covers the fundamental principles of calibration, including the selection of reference standards, environmental conditions, and measurement uncertainties. It also specifies the methods for evaluating the performance of low-frequency voltmeters and the documentation required for calibration reports. The standard aims to establish a uniform approach for calibration activities, facilitating traceability and comparability of measurement results. It includes recommendations for handling common errors and ensuring the reliability of calibration processes.