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This document represents a supplementary update to the foundational specification concerning the measurement of electric current and voltage in high-voltage direct current systems. Issued as the second edition of supplementary provisions, it refines earlier technical requirements by incorporating advancements in testing methodologies and safety protocols. The content focuses on enhancing the precision of measurement instruments used in HVDC transmission networks, ensuring reliability under extreme operational conditions. It addresses specific challenges related to signal distortion and response time during transient events, providing detailed guidelines for calibration procedures. The text outlines standardized approaches for verifying the accuracy of sensors deployed in demanding industrial environments, particularly those operating at ultra-high voltages. By establishing uniform criteria for data acquisition and analysis, this update supports interoperability among global power grid components. The provisions are designed to facilitate consistent implementation across different regional networks, promoting stable energy distribution. All technical parameters reflect the consensus of international experts regarding optimal performance benchmarks. This revision complements the primary standard by clarifying ambiguous points and expanding on practical application scenarios without altering the core framework of the original document.