From Separate to Combined: Lab Companion Temperature & Humidity Test Chambers Enable Compliant Cyclic Testing per GB/T 2423.34-2024
Aug 25, 2026
1. New Standard Upgrade: GB/T 2423.34-2024 Moves Beyond Isolated Environmental Testing
Officially released on August 23, 2024, and fully enforced on March 1, 2025, GB/T 2423.34-2024 (Test Z/AD) defines a new temperature/humidity combined cyclic test method for electronic components and devices. The standard accelerates environmental aging evaluation to verify product durability under alternating high-temperature/high-humidity and low-temperature conditions.
Unlike traditional testing protocols that execute temperature and humidity tests separately, this updated standard simulates real-world coupled environmental stress. In actual service conditions, temperature and humidity change simultaneously: equipment heats up and absorbs moisture during operation, while cooling creates condensation at shutdown. Isolated step-by-step tests fail to replicate such dynamic changes and often miss latent structural defects.
The Test Z/AD procedure introduces cyclic coupling of thermal and humid stress. Test specimens undergo repeated shifts between hot-wet and cold environments, triggering breathing effects and freeze-thaw infiltration. For components with micro-cracks or porous structures, this cyclic mechanism accelerates moisture penetration and structural deterioration, exposing hidden failures that cannot be detected via independent temperature or humidity testing.
2. Industry Pain Point: Conventional Chambers Fail Synchronous Temperature & Humidity Control
GB/T 2423.34-2024 imposes strict synchronous control requirements throughout the entire test cycle, including staged heating humidification, cooling dehumidification, and low-temperature stabilization. Qualified testing demands stable maintenance of 93%RH ±3% humidity within 25℃–65℃ cyclic temperature variation.
Most conventional environmental chambers suffer from asynchronous temperature and humidity response. Independent heating/cooling and humidifying/dehumidifying systems cause obvious parameter lag: humidity fails to rise synchronously during temperature increase and drops sharply during cooling. This deviation leads to invalid test data, certification failures, and prolonged R&D cycles.
A typical industry case verified this flaw: during a legacy standard test, the chamber reached the target temperature quickly, while humidity lagged for more than 2 minutes. The early test phase operated under an abnormal high-temperature & low-humidity condition. Audit teams rejected the test results directly after reviewing the operation curves, due to non-compliant environmental conditions.
It is clear that compliant cyclic testing relies not only on a chamber’s extreme parameter range but on synchronized, stable, and repeatable temperature-humidity control in real time.
3. Lab Companion TH Series: Fully Optimized for GB/T 2423.34-2024 Compliance
Founded in 2005 and based in Dongguan, China, Lab Companion is a national high-tech enterprise specializing in environmental test equipment. The TH Series temperature and humidity alternating test chambers are fully adapted to GB/T 2423.34-2024 Test Z/AD, while complying with IEC60068, MIL-STD-810F, GJB150A, and GB2423 international military and civil standards. The series provides reliable, high-precision environmental reliability verification for electronic components, automotive parts, and industrial products.
3.1 Full-Coverage Temperature & Humidity Range
The TH Series features a wide adjustable temperature range of -75℃ to 180℃ and a standard humidity range of 10%–98%RH, completely covering the 25℃–65℃ cyclic temperature and 93%±3% high-humidity working conditions required by GB/T 2423.34-2024. Sufficient parameter margins reserve capacity for customized accelerated aging and stress screening tests.
Standard chamber volumes range from 224L to 2040L, with custom non-standard sizes from 80L to 8000L available. Flexible internal dimension design adapts to various specimen sizes and batch testing demands.
3.2 High Precision Strictly Meets Standard Tolerance
Equipped with Lab Companion’s self-developed C100 PID fuzzy logic control system, the TH Series achieves precise and stable parameter output. The temperature accuracy reaches 0.25–0.3℃, and humidity control accuracy is maintained within 1%–3%RH. Even at the critical 93% high-humidity working point, the system stably meets the standard tolerance requirements.
Built-in functions including automatic self-check, linear temperature/humidity calibration, timing startup, and fault auto-stop ensure consistent test accuracy and eliminate manual operation errors.
3.3 Synchronous Control Technology Solves Asynchronization Defect
The core advantage of the Lab Companion TH Series is ultra-fast synchronous temperature and humidity response (≤30 seconds). The C100 controller dynamically collects cavity environmental data and intelligently adjusts the output power of refrigeration, heating, humidification, and dehumidification modules, realizing simultaneous rise, fall, and stabilization of temperature and humidity.
Adopting a vortex duct design and high-speed centrifugal fan with 50 air circulations per minute, paired with a honeycomb airflow diffusion structure, the chamber achieves excellent temperature field uniformity. The steam humidification system ensures uniform humidification without water droplet condensation, effectively preventing secondary damage to precision electronic specimens.
3.4 Customizable Program for Accurate Standard Curve Reproduction
The GB/T 2423.34-2024 Test Z/AD procedure contains complex asymmetric cycles: only 5 out of 10 total cycles include low-temperature stages, with repeated temperature switching between 25℃ and 65℃. Traditional controllers cannot accurately replicate such complex logic.
The Lab Companion C100 controller supports multi-segment alternating program editing. Users can freely set temperature, humidity, duration, and cycle counts to restore standard test curves 1:1. Fully automatic unattended operation ensures test consistency and traceability.
3.5 Industrial-Grade Stability for Long-Term Continuous Operation
Complete Test Z/AD validation requires several days of uninterrupted cyclic operation. The TH Series adopts a high-efficiency refrigeration system equipped with German BIZER compressors and advanced hot gas bypass stepless regulation technology, improving energy efficiency while maintaining optimal refrigeration performance.
Built-in real-time pressure monitoring and over-temperature jet cooling protection protect the compressor from overload damage. The humidification system features auto water refilling and upper/lower water level protection to prevent dry burning. All core components adopt international premium brands, ensuring zero drift and stable operation during long-duration environmental screening and aging tests.
4. Conclusion
The implementation of GB/T 2423.34-2024 marks a crucial upgrade from separate single-stress testing to coupled temperature-humidity cyclic reliability testing. For electronic component manufacturers, this standard delivers more realistic and rigorous environmental verification and raises higher requirements for test equipment performance.
As a professional environmental test equipment manufacturer, Lab Companion TH Series chambers provide fully compliant, high-precision, and highly stable test solutions for GB/T 2423.34-2024 certification. With synchronous temperature-humidity control, wide parameter coverage, customizable programming, and industrial durability, our equipment helps global enterprises accurately expose product latent defects, optimize structural design, and accelerate product certification and market launch.
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