OK-ZTH-398 Combined Temperature-Humidity-Vibration Test System

Overview

The OK-ZTH-398 Combined Temperature-Humidity-Vibration Test System is an integrated environmental reliability test platform engineered for simultaneous application of thermal, hygric, and mechanical (vibratory) stress profiles. It operates on the principle of multi-domain coupling—where controlled sinusoidal, random, or transient vibration excitation (via electromagnetic shaker) is precisely synchronized with programmable temperature and humidity conditioning inside a vibration-compatible environmental chamber. Unlike standalone vibration tables or climate chambers, this system enables real-time co-application of stresses that replicate field-relevant operational and transport conditions—such as automotive under-hood thermal cycling during road-induced vibration, avionics exposure to condensing humidity while undergoing flight-spectrum random shake, or consumer electronics subjected to thermal shock and mechanical fatigue in humid coastal environments. Its architecture conforms to the functional definition of a Class III combined environmental test system per IEC 60068-2-64, IEC 60068-2-78, and MIL-STD-810H Method 514.7 & 507.6.

Key Features

• Electromagnetic vibration exciter with closed-loop acceleration control, supporting sine, random, shock, and time-history replication waveforms up to 3000 Hz bandwidth
• Vibration-compatible environmental chamber constructed with reinforced stainless-steel inner walls, anti-resonant structural isolation, and low-inertia insulated viewing window
• Triple-stage refrigeration system with cascade compressor design enabling −70 °C base temperature and rapid ramp rates of 5/10/15 °C/min across full temperature range
• Steam-based humidification system with PID-controlled saturated steam injection and condensate recovery loop for stable RH control from 20–98 %RH within 20–85 °C operating envelope
• Integrated master controller with deterministic real-time OS, supporting synchronized multi-channel profile execution (e.g., temperature ramp + random vibration + humidity hold)
• Hardware-level safety interlocks including door-lock verification, over-temperature/over-humidity cutoff, vibration-stop-on-chamber-open, and emergency power-off cascading logic compliant with ISO 13850

Sample Compatibility & Compliance

The OK-ZTH-398 accommodates DUTs up to 15 kg mounted on standard 350 mm × 350 mm shaker table surface, with usable internal chamber volume of 398 L (W×D×H: 800 × 600 × 830 mm), accounting for dynamic clearance around moving coil and thermal insulation layers. It supports mounting configurations including slip-table adapters, vertical/horizontal orientation kits, and custom fixture interfaces (ISO 13028-compliant). The system meets calibration traceability requirements per ISO/IEC 17025 through factory-certified sensor validation (accelerometers, PT100 RTDs, capacitive RH sensors). Environmental test protocols executed on this platform are documented to support GLP/GMP audit trails, including electronic signature capability, user access levels, and immutable event logging aligned with FDA 21 CFR Part 11 Annex 11 principles.

Software & Data Management

The OK-TestSuite™ control software provides a unified GUI for defining multi-segment composite test profiles—including nested loops, conditional branching (e.g., “if acceleration RMS > 5 g, pause temperature ramp”), and cross-domain trigger actions (e.g., initiate humidity soak upon completion of 30-min random vibration segment). All raw data streams—vibration acceleration (m/s²), chamber temperature (°C), relative humidity (%RH), and shaker amplifier status—are sampled synchronously at ≥10 kHz and stored in IEEE-compliant .tdms format. Export options include CSV, MATLAB .mat, and universal HDF5; metadata embedding supports ASTM E2736-compliant test report generation. Remote monitoring via secure TLS 1.3 web interface allows real-time dashboard viewing, alarm notification via SMTP/SNMP, and role-based access control (RBAC) for multi-user lab environments.

Applications

• Aerospace: Qualification of satellite payload mounts under thermal-vacuum–vibration interaction analogs (using dry nitrogen purge option)
• Automotive: Validation of ADAS camera modules against combined thermal cycling and road-spectrum vibration to assess lens focus drift and solder joint integrity
• Electronics: Accelerated life testing of high-density PCBAs exposed to humidity-induced electrochemical migration under resonant-frequency dwell vibration
• Medical Devices: Verification of implantable pulse generator housing seals during simulated body-temperature cycling with micro-vibration mimicking cardiac motion
• Energy Storage: Evaluation of lithium-ion battery pack mechanical-electrochemical coupling under −30 °C cold-soak + 20–50 Hz random shake to monitor impedance rise and venting onset

FAQ

What distinguishes the OK-ZTH-398 from a standard vibration table with external climate chamber?
Unlike externally coupled systems suffering from phase lag, thermal leakage, and mechanical decoupling, the OK-ZTH-398 integrates the shaker and chamber as a single structural unit—ensuring sub-millisecond synchronization, minimized thermal gradient across DUT, and validated modal isolation above 500 Hz.
Does the system support compliance testing per MIL-STD-810 or DO-160?
Yes—the controller includes preloaded test templates aligned with MIL-STD-810H Methods 514.7 (vibration), 507.6 (humidity), and 502.6 (temperature), as well as DO-160G Sections 7, 8, and 21. Custom profile import via XML schema is supported.
Can the system perform vibration testing at sub-zero temperatures without condensation damage?
The chamber employs dew-point-controlled dehumidification pre-cooling and inert gas purge ports to maintain frost-free operation down to −70 °C, verified per IEC 60068-2-14 cold storage tests.
Is third-party calibration and IQ/OQ/PQ documentation available?
Factory-issued IQ/OQ protocols compliant with ISO 13485 and GAMP5 are provided; accredited calibration certificates (NIST-traceable accelerometers, thermistors, hygrometers) can be ordered separately.
What maintenance intervals are recommended for long-term reliability?
Preventive maintenance is scheduled every 1,000 operational hours or annually—covering shaker armature centering verification, refrigerant pressure diagnostics, steam generator descaling, and safety relay function testing per EN 61508 SIL2 requirements.