We are pleased to announce that our HALT Calculator is now available as a cloud-based application so you can access it direclty whenever you need. We also have a Paypal payment system in place on-line for quicker access.
With the cloud application, we are also offering either pay by use (you can order as many use credits as you’d like) or yearly subscriptions. The yearly subscriptions work great when you have your own chamber or when you perform many HALTs a year and you would like to run the calculator during HALT planning to set must meet criteria, or when you are in the middle of the test and trying to determine which failures to fix and continue testing.
Here is the internet version of our HALT Calculator.
When we think of HALT, we think of HALT Chambers and the stresses they provide – cold temperature, hot temperature, rapid thermal transitions, vibration stress, and combined thermal and vibration environments.
We need to expand our thinking of HALT into meaning any stress that can accelerate finding defects (in other words, to find design weaknesses before your customers find them).
Many other stresses can be used for HALT including: ESD, drop testing, bend testing, water ingress testing, and more. In this presentation, we will explore some of the HALT stresses we can apply in addition to temperature and vibration.
We will also explore some misuses of typical HALT chambers and how HALT practitioners believe just because they are using HALT chambers, they think they are performing HALT. If you are not performing HALT with the intention of discovering and expanding product margins, you are not performing HALT no matter what equipment you are using. In this presentation, we will explore some of the common errors HALT practitioners make that takes them off the path of performing HALT.
By: Mike Silverman
This blog is part of a presentation to be given by Mike at the annual Accelerated Stress Testing and Reliability (ASTR) Workshop in Denver Oct 6-8. Presentation will be posted on Ops A La Carte’s website under technical presentations.
Free Webinar: A Faster, Cheaper Method for Determining Product MTBF – the HALT AFR Calculator – Friday, Nov 6, 9am PST
Register at https://www2.gotomeeting.com/register/523479043
The Field Failure Rate Calculator is a patent pending mathematical model that, when provided with the appropriate HALT and product information, will accurately estimate the product’s field inherent AFR or Actual Failure Rate.
Vocabulary: MTBF is Mean Time Between Failure, AFR is Actual Failure Rate, HALT is Highly Accelerated Life Testing used in design engineering to improve product robustness, HASS is Highly Accelerated Stress Screening using in manufacturing to reduce infant mortalities, HASA is Highly Accelerated Stress Auditing which is an audit form of HASS. Go to www.opsalacarte.com and google those terms for more details.
On October 8, 2009, Ops A La Carte announced their Field Failure Rate Calculator. Ops A La Carte will be hosting a FREE webinar on Friday November 6th 9am PST to demonstrate the tool. For more information on this event, go to http://www.opsalacarte.com/Pages/news/news_events.htm.
The methodology has been used on a number of products with significant positive financial results. This model will also provide HASS or HASA data for the detection of an outgoing quality process shift in time from a stated AFR.
It is a patent pending Excel-based mathematical model that, when provided with the appropriate HALT and product information, will accurately estimate the product’s field AFR or Annual Failure Rate. It has been validated on over thirty products from diverse manufacturers and design environments.
The model will also provide HASS or HASA time to detect a shift in the desired outgoing failure rate.
Here are a few reasons for why and when this model should be used:
• Eliminates the need for prolonged life tests (typically several months long) which will save on development cost, space, and effort. HALT takes only a few days to run and the calculator only takes a few minutes, so the time and cost savings over typical life tests is huge.
• Quickly & accurately estimate field failure rate or Mean Time Between Failure (MTBF).
• More accurate than standard reliability predictions.
• This tool provides accurate estimates of field AFR before launching the product. This can help assure you will meet/exceed your customer expectations and allows you to accurately forecast warranty expenditures.
For more details, go to http://www.opsalacarte.com/Pages/reliability/reliability_prot_halt_calculator.htm
We uploaded a video of our HALT Vibration Table in Slow Motion.
You can actually see the different axes of vibration. Check it out at http://www.youtube.com/watch?v=l-mBFtFW7Ds.
This video was taken on a Qualmark 3.0 Typhoon table using a high speed video camera.
You are watching approximately 1.5 seconds of video expanded out to over 2 minutes. Look at how the board is flexing and moving in several different directions.
May I know why is humidity stress seldom used in HALT testing ?
Isn’t humidity is a commonly used stress that goes together with temperature during ESS ?
From: Vincent Lee, Singapore
Harry McLean’s book “HALT, HASS, and HASA Explained: Accelerated Reliability Techniques” will be released in the next few weeks. You can pre-order at:
This is planned to be a 6 x 9 hard cover, priced at $39/members of ASQ and $65/list.
In this author’s opinion, it is one of the best books written on the subject and I highly recommend it.