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On-Demand Webinar:

Unintended Consequences: The Importance of Table Uniformity with HALT/HASS

Performing HALT/HASS on multiple products results in variances in g-levels among the products, as well as large differences in the fatigue that the products incur. This presentation will focus on the principles and importance of repetitive shock and table uniformity. Attendees will learn of tools to optimize accelerated testing.

Date: November 5, 2014
Time: 2 PM EST (11 AM PST)
Duration: 1 hour
Presented by:


Accelerated stress testing finds latent defects in products under test faster than conventional environmental testing. HALT strengthens products while HASS weeds out weak products before they are shipped to customers. HALT/HASS can bring mature products to market more quickly than conventional testing methods while saving time, money, and reputation by reducing warranty and recall issues.

Testing multiple products simultaneously is often a requirement for the screening process. Repetitive shock tables are typically not uniform. Due to the exponential nature of Miner's rule, a 20%-25% deviation on the table surface of the grms level can result in more than 100 times the stress. Studies show that certain zones on a table will consistently cause premature failure in products that are located in that zone.

This presentation will focus on the theories of HALT and HASS and why they are very effective as testing tools. Accumulated fatigue damage and Miner's rule will be analyzed to illustrate how fatigue and latent defects affect the product(s) under test. The importance of table uniformity will be discussed on how it can contribute to the success or failure of a test. Solutions to this problem will be discussed, including Thermotron's patent pending Multi-Zone Control.

Key Takeaways

  • Understand why a uniform table will achieve more consistent, dependable test results
  • Learn why conventional HALT/HASS systems are not uniform
  • Understand how accumulated fatigue causes damage and forces latent defects on products under test
  • Learn how Thermotron's Multi-Zone Control achieves table uniformity while testing multiple products simultaneously


Mike Hicks, Application Engineer, Thermotron

Mike Hicks is an application engineer with 20 years of experience in manufacturing and testing of electronic assemblies and 15 years of experience of testing and training with HALT/HASS.

Mark Pyk, Marketing Manager, Thermotron

Mark Pyk is Thermotron's marketing manager. He has more than 10 years of experience in industrial marketing.