LED diodes – Life test

November 16, 2009 | 3 Comments

I’m testing LED diodes – life test. Can anyone help me with determination of upper test temperature? Operational temperature is -40°C to +50°C. Can I exceed upper temperature and if so for how much? Kind regards, Bla¾ blaz.kramer@yahoo.com

Nov

3

Free Webinar: A Faster, Cheaper Method for Determining Product MTBF – the HALT AFR Calculator – Friday, Nov 6, 9am PST

November 3, 2009 | 1 Comment

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 Background: 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 [...]

Oct

17

HALT Vibration Table in Slow Motion

October 17, 2009 | Leave a Comment

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 [...]

Jul

23

Chi Squared Distribution for RDT

July 23, 2009 | Leave a Comment

Chi Squared Distribution for Reliability Demonstration Testing When planning a Reliability Demonstration Test (RDT), your objective is to demonstrate a certain reliability (or MTBF) at a certain Confidence Level (CL). If you want to determine what MTBF at a particular CL you have demonstrated, if you tested T number of hours, you would use the [...]

Apr

24

HALT and Humidity

April 24, 2009 | 2 Comments

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

Mar

14

ORT Programs

March 14, 2009 | Leave a Comment

Here is a question that came in from Jason Li on ORT. If the product/component is qualified through initial qualification, then, the product design and the manufacture process is qualified. The activity after product launch is to ensure the manufacturing process is under the control through the necessary quality activities such as SPC. There is [...]

Feb

7

New HALT and HASS Book

February 7, 2009 | 9 Comments

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: HALT, HASS, and HASA Explained: Accelerated Reliability Techniques 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 [...]

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