EN 61028:1993/A1:1995

Overview

EN 61028:1993/A1:1995 (IEC 1028 Amendment 1) is the European adoption of an International Electrotechnical Commission (IEC) amendment that updates requirements for electrical measuring instruments - X‑Y recorders. Published as an amendment in 1995 and later adopted by national bodies (e.g., SIST EN 61028:1995/A1:2001), this document refines test methods, definitions and performance limits used to assess X‑Y recording instruments for measurement and charted output of electrical and magnetic quantities.

Key Topics

• Definitions and accuracy: Clarifies the meaning of accuracy for accessories - defined as the closeness of the marked value to the conventional true value.
• Intrinsic error determination: Specifies conditions for reading measured values from charts and requires corrections when values are read from chart lines to account for chart line spacing.
• Dead band limits: Replaces prior wording with a clear statement that under reference conditions the dead band is included within the intrinsic error and allows controlled increases of the dead band when one influence quantity varies within its nominal range.
• Influence quantities and nominal range: Sets limits on permissible variations when the nominal range of use extends beyond reference ranges; these variations must not exceed values given in the standard’s tables (e.g., Table II).
• Sensitivity and preferred values: Updates preferred units and presentation (value of measurand per millimetre) to harmonize sensitivity reporting.
• Technical editorial updates: Several subclauses and tables were revised (referenced in the amendment by page), improving clarity for manufacturers and test labs.

Applications

• Manufacturers of X‑Y recorders use EN 61028/A1 to design and verify compliance of instruments used for plotting two‑axis measurements (voltage vs. current, phase plots, dynamic trace recording).
• Calibration and test laboratories apply the standard’s procedures to determine intrinsic error, dead band, and sensitivity for quality control and certificates.
• Test engineers and R&D teams rely on the standard for consistent performance criteria when integrating X‑Y recorders into measurement systems for electrical and magnetic quantities.
• Procurement and regulatory bodies reference the standard to define acceptance criteria for instrumentation.

Who Should Use This Standard

• Instrument manufacturers and designers
• Calibration laboratories and metrology institutes
• Electrical test engineers and quality assurance teams
• Compliance officers and standards committees

Related Standards

• EN/IEC standards covering electrical measuring instruments and metrology (see IEC technical committee 85 publications) for broader requirements on measurement accuracy, influence quantities and calibration practice.

Keywords: EN 61028, X-Y recorders, electrical measuring instruments, IEC 1028, intrinsic error, dead band, sensitivity, calibration, measurement accuracy.