IEC 60966-3:2008

Overview

IEC 60966-3:2008 is the sectional specification for semi-flexible coaxial cable assemblies used in radio frequency (RF) applications operating in the transverse electromagnetic mode (TEM). It defines uniform requirements and test procedures for finished assemblies (cable + connectors) to verify electrical, mechanical and climatic performance. This third edition refines and clarifies the tests to be performed and is intended to be read in conjunction with IEC 60966-1:1999 (generic specification).

Key topics and technical requirements

• Scope and definition: Applies to finished semi‑flexible coaxial cable assemblies; specifications apply to the assembled unit rather than separate parts. Length is measured between connector reference planes; default tolerances are ±1% (≥300 mm) or ±3 mm (<300 mm).
• Design and materials: Cables should conform to IEC 60096-2 or IEC 61196; connectors to IEC 61169 where applicable. Material details are provided in the detailed specification.
• Marking and packaging: Requirements for assembly identification, end caps and optional markers when specified in the detail specification.
• Quality assessment: Uses IEC quality assessment principles and sampling plans (e.g., IEC QC/IEC 60000 series references).
• Electrical tests:
  • Reflection/return-loss and preferred parameter presentation (A = −20 log r). VSWR or reflection factor may also be specified.
  • Insertion loss stability: not applicable to semi‑flexible assemblies.
  • Phase-difference limits between matched assemblies are measured per detail specification.
  • Screening effectiveness / transfer impedance: preferred maximum values at 30 MHz - 30 μΩ/m, 300 μΩ/m, or 3 mΩ/m (as specified).
  • Dielectric/withstand voltage tests performed at sea level unless higher altitude specified; preferred pressure values: 86 kPa (sea level), 25 kPa (10 km), 4.4 kPa (20 km).
• Mechanical and environmental tests:
  • Vibration (test Fc of IEC 60068-2-6) with three orthogonal axes; continuity monitored and interruptions must not exceed 1 µs. Post-test insertion/return loss must remain within specified limits.
  • Flexure and flexing-endurance tests are not applicable to semi‑flexible assemblies.
  • Additional bump and shock tests when specified.

Applications and who uses it

• Manufacturers of RF cable assemblies and coaxial cable assembly suppliers use IEC 60966-3:2008 to define product construction, test schedules and acceptance criteria.
• Test laboratories and quality managers adopt the standard for electrical verification (return loss, VSWR), screening effectiveness and environmental qualification.
• Systems integrators and procurement/specification engineers reference the standard when ordering semi‑flexible coaxial assemblies for telecom, broadcast, aerospace and industrial RF systems where TEM-mode performance and environmental robustness are required.

Related standards

• IEC 60966-1:1999 (Generic specification - mandatory companion)
• IEC 60068-2-6 (Vibration test Fc)
• IEC 60096-2 / IEC 61196 (Cable specifications)
• IEC 61169 (RF connectors)

Keywords: IEC 60966-3:2008, semi-flexible coaxial cable assemblies, RF cable assemblies, TEM mode, return loss, VSWR, transfer impedance, vibration test, IEC standard.