|Home||>||>||Highly Accelerated Life Testing ( HALT )|
Highly Accelerated Life Testing (HALT)
HALT is a practical methodology for determining the ruggedness or robustness of a product. Statistically, long term reliability has been shown to correlate reasonably with ruggedness of design. Thus HALT provides a number of major benefits for designers and manufacturers. These key benefits include:
First developed in the USA during the 1980s, Highly Accelerated Life
Testing (HALT) is a practical rather than a predictive method – MTBF
and MTTF data are not generated.
The HALT chamber is LN2 cooled to give rapid thermal transitions i.e. 60C/min between –100 and +200C and gives random vibration in 6 axes, three translational, three rotational simultaneously over a broad frequency band (2-10000 Hz), up to an intensity of 60grms.
The method is an extension of accelerated life testing. The test
levels used are not based on operational data. Thermal and
mechanical stimuli are applied separately and then together in order
to determine the operating and destruct limits of the item under
test. The operating limit is defined as the point at which the unit
stops operating but returns to operation when the stress level is
decreased. The destruct limit is the level at which the product
stops functioning and remains inoperable.
The HALT Chamber at Mead Testing
A product bolted to the HALT Chamber Table
Plot of temperature cycling (red) and increasing vibration intensity (green)