OK-ZTH-519 Combined Temperature-Humidity-Vibration Environmental Test Chamber

Overview

The OK-ZTH-519 Combined Temperature-Humidity-Vibration Environmental Test Chamber is an integrated reliability testing platform engineered for simultaneous application of thermal, hygric, and mechanical stress stimuli. It operates on the principle of multi-stress synergistic acceleration—leveraging coupled environmental loading to replicate real-world operational and transit conditions where temperature cycling, moisture ingress, and dynamic mechanical excitation co-occur. Unlike sequential or single-stress testing methods, this system enables true concurrent exposure under programmable profiles, making it essential for identifying latent failure mechanisms induced by stress interaction—such as thermally driven microcrack propagation accelerated by humidity diffusion and vibration-induced fatigue. Designed in accordance with foundational principles of environmental engineering and reliability physics, the chamber supports test execution aligned with IEC 60068-2, MIL-STD-810H (Methods 502.7, 507.6, 514.7), and ISO 16750-4 for automotive electronics qualification.

Key Features

• Triple-stress synchronization engine: Independent yet coordinated control of temperature, relative humidity, and 3-axis electrodynamic vibration via a unified real-time controller with sub-second inter-loop timing resolution.
• Structurally reinforced test chamber: Welded stainless-steel inner chamber with high-damping structural framing; vibration-isolated baseplate and reinforced door sealing system rated for continuous operation at 20 g_pk and 2 kHz bandwidth.
• Down-mounted shaker integration: Electrodynamic vibration exciter installed beneath the chamber floor with hermetically sealed feedthroughs for payload mounting and signal cabling—minimizing thermal coupling and preserving humidity integrity during motion.
• Wide-range climate control: Dual-stage refrigeration system with cascade compressors, steam-humidification + desiccant drying, and PID-controlled air circulation ensuring ≤ ±0.5 °C temperature stability and ≤ ±2 %RH humidity accuracy across the full operating envelope.
• Thermally robust shaker interface: Vibration table surface and suspension components constructed from low-thermal-expansion alloys; lubricants and insulation materials qualified for −70 °C to +150 °C ambient exposure without degradation.

Sample Compatibility & Compliance

The OK-ZTH-519 accommodates samples up to 15 kg mass on standard aluminum load plates (350 W internal heat dissipation capacity), with optional custom fixture interfaces for aerospace avionics, automotive ECUs, and PCB assemblies. Chamber dimensions support standard MIL-STD-810H test article mounting configurations. All control firmware and data logging modules comply with GLP/GMP traceability requirements—including electronic signature support, audit trail generation, and secure user access levels per FDA 21 CFR Part 11 Annex 11 guidelines. Calibration procedures follow ISO/IEC 17025-accredited protocols, with optional NIST-traceable sensor validation packages available.

Software & Data Management

Equipped with OK-TestSuite™ v4.2, a deterministic real-time test sequencing platform supporting complex multi-segment profiles—including ramp-hold-vibrate cycles, step-and-dwell humidity transitions synchronized with random vibration PSD envelopes, and conditional trigger-based event logging. The software provides synchronized acquisition of up to 16 analog/digital channels (e.g., DUT voltage, thermocouple readings, accelerometer outputs) at 10 kHz sampling rate. All raw data is stored in IEEE-compliant HDF5 format with embedded metadata (test ID, operator, timestamp, calibration status). Export options include CSV, MATLAB .mat, and XML-based test report templates compliant with ISTA 3A and ASTM D4169 transport simulation standards.

Applications

• Automotive: Validation of ADAS sensors, battery management systems, and infotainment units under combined desert-heat/high-humidity road vibration profiles per ISO 16750-4 and GMW14872.
• Aerospace: Full-mission simulation for UAV payloads—from ground-level thermal soak through altitude-induced cooling and turbulence-induced broadband excitation—aligned with DO-160G Section 24 (Vibration) and Section 25 (Temperature/Humidity).
• Consumer Electronics: Accelerated life testing of wearables and mobile devices under body-temperature humidified environments with walking-induced harmonic vibration (0.5–5 Hz).
• Packaging Engineering: Assessment of cold-chain integrity for pharmaceutical shipments exposed to maritime humidity, refrigerated truck vibration, and warehouse temperature fluctuations per ISTA 3E and ASTM D6059.

FAQ

What standards does the OK-ZTH-519 support for combined stress testing?

It natively supports test method definitions from IEC 60068-2-68 (combined temp/humidity/vibration), MIL-STD-810H Method 520.5 (Combined Environments), and ISO 16750-4 Annex C (Simultaneous Vibration and Climate Stressing).
Can the system perform HALT-style overstress testing?

No—the OK-ZTH-519 is designed for environment-representative reliability verification, not defect precipitation. For HALT/HASS applications, OK Instruments offers the separate OK-HALT-3000 series with higher ramp rates (>60 °C/min) and multi-axis vibration capability.
Is remote monitoring and control supported?

Yes—via secure TLS-encrypted Ethernet connection with web-based HMI access, SNMP alarm reporting, and OPC UA server integration for factory MES/SCADA interoperability.
What maintenance intervals are recommended for long-term operational stability?

Compressor oil and desiccant replacement every 12 months; shaker armature alignment and sensor recalibration biannually; full system performance verification annually per ISO/IEC 17025 checklist.
Does the chamber support low-pressure (altitude) integration?

Not natively—but OK Instruments offers the OK-ZTHP-519 variant with integrated vacuum pump and pressure control module (5–101 kPa range) for four-stress (temp/humidity/vibration/pressure) testing per DO-160G Section 21.