SIST EN IEC 55016-1-1:2019/oprA1:2024 (Frag 2)

Overview

EN IEC 55016-1-1:2019/prA1:2024 (Frag 2) is an amendment fragment to CISPR 16‑1‑1 that addresses discontinuous analyzers and the measurement of discontinuous (click-like) disturbances in the presence of continuous background interference. Issued as a Committee Draft for Vote (CDV), the text clarifies detection and assessment methods for discontinuous disturbances when automatic detectors may be influenced by variable continuous emissions. This document is part of the CISPR/IEC work on radio‑interference measurements and electromagnetic compatibility (EMC).

Key Topics

• Discontinuous analyzers (DDAs): Guidance on how automatic DDAs can be affected by variable continuous disturbances and when manual intervention is required.
• Continuous disturbance definition: Described as background noise that can periodically trigger the IF reference level set to the quasi‑peak (QP) limit while its QP level remains below the QP limit.
• Dynamic threshold (IF reference level): Modern DDAs use a dynamic threshold acting on the IF reference level; this amendment requires setting it appropriately to:
  • determine the duration of discontinuous clicks during tests,
  • assess compliance with all test pulses referenced in Table 14 and Table F.1.
• Manual measurement options:
  • Use a manually operated oscilloscope to exclude continuous background influence.
  • Apply manual DDA settings (dynamic threshold and activation parameters) where automatic detection is unreliable.
  • When using an oscilloscope, set the trigger level higher than the IF reference to avoid false triggering by continuous disturbances.

Practical Applications

Who uses this standard:

• EMC test engineers and laboratories conducting radio‑interference and quasi‑peak measurements.
• Manufacturers of electronic equipment needing to evaluate discontinuous emissions (clicks/pulses) for product compliance.
• Test equipment designers implementing DDAs and IF reference/dynamic threshold functions.
• Standards committees and conformity assessment bodies referencing measurement procedures for EMC certification.

Why it matters:

• Ensures more reliable detection and characterization of discontinuous disturbances in real‑world noisy environments.
• Provides practical guidance to avoid false triggers from background emissions and to correctly assess pulse amplitude, separation, rate, and duration.
• Helps maintain consistency with CISPR measurement requirements and test pulse compliance.

Related Standards

• CISPR 16‑1‑1 (Radio‑interference measurements and statistical methods) - primary normative reference for this amendment.
• EN IEC 55016 series - broader family covering radiated and conducted disturbance measurements and detectors.

Keywords: EN IEC 55016-1-1, CISPR 16-1-1, discontinuous analyzers, DDAs, EMC measurements, discontinuous disturbances, dynamic threshold, IF reference level, quasi-peak (QP), oscilloscope triggering.