The failures identified during the precipitation screen are confirmed and other soft and hard failures are noted. HASS testing comes into play once the product is ready for manufacturing. During the HALT process, a product is subject to increasing stress levels of temperature and vibration (independently and in combination), rapid thermal transitions, and other stresses specifically related to the operation of your product. Traditional test methods often take several weeks or upwards of many months to find any lackluster components of a product’s design. Data acquisition systems are collections of hardware and software that work together to allow an individual to control the physical characteristics of something remotely. The less a company has to roll out warranty services and product recalls, the better. HASS is also a stress testing methodology performed to improve the reliability of the finished product. While HALT is performed during the development stage, HASS is performed during the manufacturing stage and otherwise prior to shipment and sale. Reliability growth testing (RGT) goes hand-in-hand with HALT testing and is used to provide engineers with feedback about the stress tests being conducted. HASS is performed on a component after HALT (Highly Accelerated Life Testing), as testing is based on the results of the previous HALT. We’re an ISO 9001:2015 certified facility with years of experience providing high-quality products for military operations, agriculture, construction, and transportation. Highly Accelerated Stress Screening (HASS) is a production quality assessment to quickly and efficiently identify any weaknesses that the product may have inadvertently developed during the manufacturing stage. The precipitation screen consists of high levels of steady vibration and temperature rate of changes of approximately 40 – 60 °C/minute. The second part of the HASS profile (40 – 75 minutes) is a detection screen used to detect precipitated defects. For more information on HASS, HALT or other testing services, contact DES or call 610.253.6637. These tests also should be used in conjunction with other reliability testing strategies to cover all bases and get a complete picture of how your product responds in any situation. Website Design & Internet Marketing by IQnection. It is also much less destructive than HALT testing, so a good product will remain intact. 3900 Broadway Road, Easton, PA 18040 Happy customers lead to increased profits/market share! Highly Accelerated Life Test (HALT) and Highly Accelerated Stress Screen (HASS) are often used in conjunction with one another. You can either use low levels of stress for many cycles or use a very high level of stress for much fewer cycles. P 610.253.6637 | F 610.253.5273, Copyright © 2020 desolutions.com Engineers praise HALT testing techniques because it lets them improve the design of their products in a much easier and time effective way. You can achieve the highest level of customer satisfaction by ensuring your products are free from defects. During HASS, stresses may be higher than normal operation to precipitate defects in a short amount of time, however the stresses are within the capability of the design as proven by the HALT. After HALT testing, Highly Accelerated Stress Screening (HASS) is a follow-on method to monitor the manufacturing process. To regularly audit or screen your production components to check for and improve manufacturing quality, To produce a more rugged/reliable product with less field failures and warranty expenses. Highly Accelerated Stress Screening. HASS testing (Highly Accelerates Stress Screening) is a proven screening method developed to find manufacturing and production process induced defects in electronics and electro-mechanical assemblies, before those products are released to market. Product failures caused by inherent defects are accelerated to evaluate results. Required fields are marked *. It also only stresses on lower operational levels and does not bring the same kind of intensity as HASS testing does. The main goal behind HASS is to highlight any manufacturing problems that could lead to products failure during shipping, storage, and regular use. Your email address will not be published. These damage mitigation techniques can become extremely expensive and should be avoided at all costs. To learn more about. Related Resources: There also may be other elements tested depending on the specific product. A detection screen is carried out and the product is evaluated at near operating limits. Delserro Engineering Solutions It is a screening method used to expose manufacturing defects that would cause a failure in normal field environments including shipping, storage and use. HALT testing is considered a discovery test, so you must be flexible while performing them. This translates into lowered costs of ownership and product warranty liabilities as well as creates a more reliable, responsible market product. Preventing poorly designed products from going out on the market will help make a customer’s view of what you produce to be more worthwhile due to those products lasting their estimated life and beyond. After a full sequence of HALT testing, engineers may decide to make changes to the product, then it undergoes more sequences of HALT tests, expanding its failure limits to maximize margins and optimize its durability. Innovation is at an all-time high and customers expectations are only getting higher. DES has more than 20 years of experience performing HALT/HASS testing on a variety of medical, commercial, industrial and military products. After HALT testing, Highly Accelerated Stress Screening (HASS) is a follow-on method to monitor the manufacturing process. HASS stresses are based on the limits identified through HALT. The typical routine for conducting a HASS test includes: This process is repeated through four cycles, increasing the operational level each time if faults were not detected. Screening process exposes latent defects in components and assemblies Used during production to ensure ongoing product quality and reliability The detection screen consists of lower levels of modulated vibration and slower temperature rate of changes of approximately 5 – 10 °C/minute. It is sometimes easier to find intermittent defects during the detection screen because the stress levels are lower and the temperature rate of change is slower. HASS is an acronym for Highly Accelerated Stress Screening. How is this accomplished? You can also request a free consultation by filling out our request a quote form. Contact us with any questions! In this sense, HASS testing procedures are very similar to other environmental stress screenings. A precipitation screening pushes the product beyond its operating limits or to the point where it’s nearly destroyed. Doing so could become an added expense if you push these tests to the limits and use a large number of units, which is the protocol for HALT testing. These markets require products to be released to the market very quickly, so HALT/HASS tests are particularly advantageous in this domain. Studies conducted in accelerated reliability testing labs have shown that 32% of faulty components would go unnoticed without reliability planning procedures that include HALT and HASS testing.
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