Tuofeng TFW-225 Microcomputer-Controlled Electronic Universal Testing Machine for Wire Harness Terminal Pull-Off Testing

Overview

The Tuofeng TFW-225 is a high-precision, microcomputer-controlled electromechanical universal testing machine engineered specifically for quantitative mechanical evaluation of wire harness terminals, crimped connectors, solder joints, and related electrical interconnect systems. It operates on the fundamental principle of controlled uniaxial force application—measuring tensile separation force, pull-off resistance, crimp retention strength, and interfacial bond integrity under standardized displacement or load control. Designed to meet the stringent repeatability and traceability requirements of automotive OEMs, Tier-1 suppliers, and UL/CSA-certified cable assembly laboratories, the TFW-225 delivers metrologically sound data compliant with ISO 11339 (adhesion of crimped contacts), SAE J1742 (electrical connector pull strength), USCAR-21 (automotive connector performance), and IEC 60512-2-1 (connectors for electronic equipment – mechanical tests). Its rigid C-frame architecture, thermally stable load train, and real-time closed-loop servo control ensure sub-micron positioning fidelity and force stability over extended test durations—critical for evaluating creep behavior, cold flow, or relaxation effects in terminal insulation materials.

Key Features

• 0.5-class accuracy certified per GB/T 16491–2008 and JJG 475–2008, with force resolution of 1/500,000 full scale and no range-switching artifacts
• Dual-speed motorized crosshead actuation (fast approach + precision testing mode) enabling rapid setup and high-fidelity low-speed testing down to 0.001 mm/min
• Integrated safety architecture: hardware-based dual-end limit switches, programmable overload cutoff (110% FS), redundant emergency stop circuitry, and automatic post-test return sequence
• Modular fixture interface supporting DIN 50125-compliant tensile grips, custom-designed terminal pull fixtures (e.g., MIL-STD-1344 Method 2011), and axial alignment jigs for coaxial loading
• Real-time digital signal processing engine sampling at ≥1 kHz, ensuring accurate capture of transient peak forces during brittle terminal failure or insulation rupture
• Thermally compensated load cell with temperature drift <0.02% FS/°C, validated across 10–40°C ambient operating range

Sample Compatibility & Compliance

The TFW-225 accommodates wire harness assemblies ranging from AWG 30 (0.05 mm²) to AWG 2/0 (67.4 mm²), including insulated and bare terminals, FAKRA, HSD, and LVDS-style connectors, and multi-pin modular housings. Fixture adaptability extends to ISO 8092-2 (crimp tool validation), IPC-A-610 (acceptability of electronic assemblies), and GMW3172 (general motors wiring system requirements). All mechanical test protocols are fully traceable to national and international standards: GB/T 228.1 (metallic materials tensile testing), ASTM D412 (rubber tensile properties), ISO 527 (plastics tensile behavior), and UL 486A-B (wire connectors). Calibration certificates include NIST-traceable uncertainty budgets per ISO/IEC 17025 requirements.

Software & Data Management

Tuofeng TestSuite™ v5.2 is a Windows-based, 64-bit application supporting CFR 21 Part 11 compliance when configured with role-based user accounts, electronic signatures, and immutable audit trails. The software provides synchronized multi-curve visualization (force–time, stress–strain, displacement–time), automated parameter extraction (pull-off force, yield point, elongation at break, modulus), and batch statistical reporting (mean, SD, CV%, min/max, trend charts). Raw data exports to CSV, XML, and PDF formats; integration with LIMS via ODBC or REST API is supported. Custom test method templates can be created and locked per SOP, with version-controlled revision history. Firmware and software updates are delivered remotely with SHA-256 hash verification.

Applications

• Quantitative validation of crimp joint integrity per SAE AS7928 and IPC/WHMA-A-620
• Comparative analysis of terminal plating adhesion (tin, silver, gold) under thermal cycling preconditioning
• Interfacial shear strength measurement between insulator polymer and metal contact barrel
• Creep testing of polyamide (PA66) and PBT housings at elevated temperatures (85°C/85% RH)
• Statistical process control (SPC) of crimp height and pull force correlation in high-volume production lines
• Failure mode analysis (FMA) of premature disengagement, barrel fracture, or wire pull-out
• Qualification testing for EV battery harnesses per ISO 6469-3 and UN ECE R100

FAQ

What standards does the TFW-225 support out-of-the-box?
Preloaded test methods cover ISO 11339, SAE J1742, USCAR-21, IEC 60512-2-1, GB/T 228.1, ASTM D412, and UL 486A-B. Custom standard templates can be imported via XML schema.
Can the system perform hold-load tests for crimp relaxation studies?
Yes—programmable dwell periods at user-defined load levels (0.1–10,000 s) with real-time force decay logging and % relaxation calculation.
Is third-party calibration certification included?
Each unit ships with a factory calibration certificate traceable to CNAS-accredited labs; optional UKAS/NIST-traceable recalibration services available annually.
How is alignment verified for terminal pull tests?
The system includes an optical alignment verification kit (±0.1° angular tolerance) and adjustable vertical/horizontal fine-tuning stages to ensure coaxial loading per ISO 2747.
Does the software support multi-user environments with permission tiers?
Yes—administrator, operator, and reviewer roles with configurable permissions for method editing, test execution, data export, and report approval.