HALT / HASS TESTING
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Who uses HALT / HASS testing?
Most manufactures of consumer, industrial, and military products implement and manage corporate-wide testing
programs in order to meet market demand in providing reliable and cost-effected products.
More stress or more time?
The power of HALT testing (Highly Accelerated Life Test) is derived
from a simple basic principle – if you wish to fatigue a component,
populated printed circuit board, subassembly or finished product
you can stress it with lower levels of stress for a lot of cycles, or use
a higher level of stress for a fewer number of cycles.
Why does HALT testing work?
In order to verify designs, component specifications, and testing
approaches make no attempt to improve product robustness In
order to verify designs, component specifications, and beyond
operating specifications. But in today’s competitive manufacturing
processes, traditional new product verification manufacturing
processes, traditional new product verification testing approaches
make no attempt to improve product robustness beyond operating
specifications. But in today’s competitive marketplace, the design
phase presents a perfect opportunity to test a product to find its
maximum limitations. So, in contrast to traditional DVT (Design
Verification Testing) which utilizes relatively low stresses and
requires many cycles, the purpose of HALT is to find all possible
failure modes - and it does so in far less time than ESS
(Environmental Stress Screening), burn-in or other methods.
Why does HASS testing work ?
HASS - Highly Accelerated Stress Screen
Early life product failures are often attributable to the inherent
variability of manufacturing processes (solder and component
changes, etc.). Even a well designed product can suffer high early
failure rates where process-induced failures are not found and fixed
before the product reaches the customer.
HASS testing (Highly Accelerated Stress Screen) is an accelerated
reliability screen that can reveal latent flaws not detected by ESS
(Environmental Stress Screening), burn-in and other test methods.
HASS testing uses stresses beyond specification, but within the
capability of the design as determined by the HALT. The
combination of variable thermal and simultaneous vibration
stresses, in conjunction with product specific stresses, finds those
defects and marginal products that used to show up as “out of box”
infant failures, and increased warranty costs. Because the stresses
in HASS are more rigorous than those delivered by traditional
approaches, HASS testing substantially accelerates early discovery
of manufacturing process issues. Reliability engineers can then
correct the variations that would otherwise lead to field failures and
virtually eliminate shipment of marginal product.
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