HALT HASS
Maximise product reliability with HALT HASS Systems
Highly Accelerated Life Testing (HALT) and Highly Accelerated Stress Screening (HASS) are methods of testing product reliability aimed at finding stress-related defects in products. HALT/HASS Test Systems subject products to overstresses and accelerate fatigue to reveal weakness in design and composition by random six-degree-of-freedom vibration and rapid temperature change to test combined environmental factors.
At CentraTEQ, we offer Hanse Environmental’s extensive range of HALT/HASS Chambers. Hanse manufacture the largest standard line of HALT/HASS Chambers in the industry, and are committed to continually advancing the performance of their chambers. 8 standard models are available as well as customised configurations, providing temperature cycling and full 6-degrees-of-freedom.
Highly Accelerated Life Test (HALT)
The HALT test is used during product development to determine initial weaknesses in the product by incrementally increasing stress levels to reach component destruct levels and using the results to replace weaker components, thereby increasing product reliability. Improved product life can also be accomplished.
Highly Accelerated Stress Screening (HASS)
The HASS Process is a production screen that helps to assure that weak components can be discovered and eliminated during the production process. HALT experience and step stress empirical evaluation can be implemented to establish a good screen. This process must be evaluated over time to assure that it is effective.
Performance
- Temperature Range: -100 to +200oC
- Temperature Change Rate: 70°C/min (-65 to +100°C with 50lb Aluminium Fin Coil Load)
- Temperature Control: ± 1°C after stabilisation
- Tri-Axial Vibration: Six-Degree-of-Freedom (6DoF) Vibration, non-coherent broadband vibration 5-10,000Hz
- New 100 gRMS In select models.
- Ceramic-Coated Vibration Table
- 90% of vibration energy in 5-4000Hz for maximum energy in low frequency range
- Ultra-Hi vibration performance option in Models V-16 and 25.
Features
The System
- HighRate™ Heating System: 3 phase solid-state Infitrol™ proportional control of open nichrome heater wire balanced system.
- HighRate Liquid Nitrogen Cooling System: Direct atomisation in control plenum, Infitrol™ proportional control valve for Models VTC-4 and up (Optional for VTC 1.5) and redundant solenoid safety valve.
- Adjustable Air Flow Plenum: For directing airflow to product. Minimum (4) 3″ diameter ports for distributed airflow to product — Models VTC-4 and up.
- Vibration Exciters: LubeMist™ lubricated vibrators with adjustable ball valves, one for each pneumatic vibrator for low G-level performance using fewer vibrators. SoftStart™ designed vibrators minimise starting shock to products.
Instrumentaion
- Programmable Temperature and Control: Programmable temperature ramps. Closed loop cascade temperature control of product under test including RS232/422/485 serial interface. HALT step-stress templates included for easy HALT chamber programming. Optional IEEE 488 GPIB and optional Ethernet TCP/IP are also available.
- Programmable Vibration Control: Programmable vibration ramps, gRMS level, and test duration all synchronised with the temperature controller. Four accelerometers can be monitored simultaneously.
Options
- Humidity: Direct injection, 10 to 85% RH from 25 to 65°C , Capacitance sensor.
- HanseView™: PSystem control of temperature and vibration. Contol, Control/Analyser, and Control/Analyser/Data Logger options.
- Vibration Fixtures: Specially designed for HALT/HASS applications.
- LN2 System: PSystem control of temperature and vibration. Contol, Control/Analyser, and Control/Analyser/Data Logger options.