Qualmark HALT & HASS

Partnering with Qualmark, the leading manufacturer of accelerated reliability test equipment, we can offer Highly Accelerated Life Testing (HALT) & Highly Accelerated Stress Screening (HASS) testing. These tests focus on finding possible defects in products therefore giving you the opportunity to analyse and improve your design before becoming expensive field issues. Stress levels that would take months to simulate can be achieved in hours.


We subject a product to a series of over stresses, this forces weak links to emerge by accelerating fatigue through extremes of temperature during random vibration sequencing.

Fundamentally this is a process tool for engineers and can expose defects in days that would otherwise take weeks of traditional testing or years of field use to show up. Portholes allow the test to be undertaken while the product is functioning to allow for constant monitoring of data.


HASS (Highly Accelerated Stress Screening) is a screening tool used to maintain product robustness and to identify weaknesses in manufacturing.

HASS can be a useful tool for cutting overall manufacturing time. If used intelligently HASS can reduce or remove extended time processes such as “conditioning” or “burn in”.

Typical problems HASS identifies:

  • Certainty of whether substituted components compromise existing design/product integrity
  • Poor manufacturing implementation of a sound design, e.g. dimensional tolerances, hidden mechanical handling damage, component stress from poor placement alignment etc
  • Poor or incorrectly applied manufacturing techniques, e.g. overheated PCB tracks lifting, dry joints, components mounted with extended or short wire tails, wire/harness tension or point load fret problems.

Development of a properly structured HASS profile requires previous data from:

  • Previous HALT results
  • Product information data
  • Validation of procedure
  • Products powered and monitored whilst under test

Combined Testing

A more familiar alternative to HALT testing. With traditional Vibration, Temperature & Humidity cycling are combined to suit specific test regimes, standards compliance, or simulation of extreme service conditions. It is possible to compress normal operational environment conditions from months/years into hours, days & weeks.

We have a number of shaker systems and a combined shaker/environmental chamber to cover a very diverse range of testing needs.

For further information Qualmark have some excellent resources available on their website.

Note that our capabilities extended beyond our UKAS accreditation. It is important to identify when you need the full UKAS conformance and when you don’t.

See our accreditation schedule, our full list of capabilities and available chambers for Sales & Hire or alternatively please contact us.

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Accreditation Schedule
Capabilities Document