IEC 62783-1-1:2022

Overview

IEC 62783-1-1:2022 - Twinax cables for digital communications - Part 1-1: Time domain test methods - General requirements - specifies time-domain test methods, parameters and requirements for test fixtures used with twinax (twin‑axial / twin‑coaxial) cables and symmetric cables with pitch. The standard defines how to measure differential, common‑mode and single‑ended transmission parameters using time‑domain techniques (TDR/TDT), and sets requirements for test equipment, fixtures, calibration and reporting to support reliable signal integrity assessment at high data rates.

Key topics and technical requirements

• Time‑domain methods: Defines Time Domain Reflectometer (TDR) and Time Domain Transmission (TDT) measurement approaches and how time‑domain displays (voltage/impedance vs time or electrical length) are used to locate and quantify discontinuities.
• Measurement equipment: Preferred setups include a sampling oscilloscope with dual‑channel TDR modules (two 2‑channel modules) or a 4‑port Vector Network Analyser (VNA) with time‑domain capability via IDFT (per IEC 62153‑1‑1).
• Test leads and cables: Use four phase‑stable, low‑loss 50 Ω coaxial leads of equal electrical length (cable length should be as short as possible, typically