IEC 60051-9:2019

Overview

IEC 60051-9:2019 is an international standard published by the International Electrotechnical Commission (IEC) that specifies recommended test methods for direct acting indicating analogue electrical measuring instruments and their accessories. This standard provides essential guidance on applicable test methods and performance requirements for test equipment used to evaluate analogue electrical measuring instruments. It is a key reference for manufacturers, quality control engineers, and testing laboratories aiming to ensure instrument accuracy, reliability, and compliance with international norms.

This fifth edition, a technical revision of the previous 1988 edition, introduces updated performance requirements for test equipment and refines references to relevant standards. It excludes special purpose instruments and accessories already covered by other IEC standards.

Key Topics

• Scope and Application: Covers direct acting indicating analogue electrical measuring instruments and related accessories, excluding special purpose devices.
• Test Equipment Requirements: Outlines necessary accuracy and stability for test instruments, including:
  • Intrinsic uncertainty measurement equipment must have maximum instrumental uncertainty of 0.2 times the class index of the instrument under test.
  • Overload, self-heating, damping, overshoot, and response time tests require test equipment with settings uncertainty within ±1%.
  • Phase shift test equipment demands uncertainties of ±1° or better for class index ≥ 0.5 and ±0.1° or better for class index