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HALT & HASS testing


The HALT tests, for Highly Accelerated Life Test, are based on a sequence of thermal and mechanical tests carry out on an equipment during its design phase.

The methodology used allows detecting failure and weakness in the design of electronic equipment's and their sub-parts. Without improvement, these failures may appear during the qualification (when it exists) or after the marketing of the product.


The HASS tests, for Highly Accelerated Life Tests, aim to induce failure modes that can be inherent in the production process. Indeed, during production the entire or part of your equipment are subjected to thermal and mechanical constraint with severity level determine from the HALT tests.







The context of HALT testing

The HALT are open to any company wishing to reduce, or even eliminate early life product failure.


A HALT test campaign is running on 3 to 5 days which is like anything with regards to weeks or months necessary to validate design.


Your products are more quickly marketing, they require less after-sales actions and they are more reliable.


More generally , advantages of a HALT test campaign are :

  • Better customer satisfaction,
  • Increase quality / reliability of your product,
  • Fast discovery of your equipment weakness,
  • Decrease in research and development costs,
  • Decrease in development time,
  • Decrease in marketing time,
  • Knowledge and improvement of design margin of your products,
  • Tracking and correcting failure before the marketing of your product (or before their qualification process),
  • Less aftersales intervention during the warranty period,
  • ...



The HALT methodology offers optimum results when used in the design process but it can bring benefits at any time of your project :

  • remedy to non-conformity detected during qualification,
  • reproduce failure.




The HASS tests take part in the advantages listed above and in correcting defects coming from manufacturing line (changes in manufacturing process, changes in the supply of components,…)




Compared to the life cycle of a product series, the HALT & HASS tests allow you to influence the 3 phases describe by the bathtub curb which represents the failure rate variation depending on the working time.









The HALT tests are part of aggravated tests process for which the aim is to explore the use of a product beyond its specifications.


In practical, thermal and mechanical tests will be applied without taking care of the life cycle of the product. No stress level limits is set beforehand and vibration tests will be made even for a fixed equipment.

HALT tests don't reproduce an environment to check the use of an equipment. They test a product till they find its working limits or even its destruction limit.

The analysis of the failure causes and the corrective actions allow building the robustness of a product and perhaps running over its profile constraint to improve its reliability.

HALT tests are directly dealing with the 3 operational origins of failure:

  • Manufacturing defect
  • Component defect
  • Design error


Here is the HALT methodology for the application of the different stresses :

  • Step by step temperature decrease (limit to -100°C)
  • Step by step temperature rise/increase (limit to +200°C)
  • Step by step "gRMS" vibration level increase (level depending on the product)
  • Rapid Temperature Variation (60°C/min – level depending on the product inertia)
  • Combined tests RTV and vibration


Specific constraint of the equipment may be added.






The HASS methodology carry out combined tests : vibrations, temperatures and RTV applied as cycles.

Before applying the HASS as control process of the manufacturing line several points have to be checked. The test profile detailing the constraints to apply have to be defined, the chamber which will host part or the entire production has to be optimized and the Proof Of Screen (POS) has to be validated.
The HASS profile comes from the tests realised with the HALT methodology.







1 HALT & HASS chamber

  • Temperature range : - 100 to + 200°C
  • Rapid Temperature Variation - RTV : 60 °C/min
  • Frequency : 10 à 10000 Hz
  • Max. acceleration : 60 gRMS
  • Vibrations : 6 DOF
  • Working space : 1,14 m³


Typhoon 2.5 XLF chamber





Related links

Ingénierie   Assistance before the tests

D'ont hesitate to place the HALT tests in the first step of your project.

Formation   Intra and inter company courses
Discover our courses on the HALT & HASS methods and their advantages





Vos contacts
Versailles centre
Switchboard : +33 (0)1 30 57 55 55
Mr PROUST Francis
33 (0)6 89 77 26 29