Embed Size (px)
Citation preview
Using Sherlock Automated Design Analysis™ Software
to benefit HALT Test Planning and
Execution
Presented By: Mr. Neill Doertenbach
Senior Applications Engineer
Sherlock, HALT and HASS – Working Together
Different tools working together to meet the ultimate goal
Increasing Reliability
Decreasing warranty costs
Increasing Customer
Satisfaction
Sherlock, HALT and HASS – Making Each Other Better
HALT HASS
Increasing Challenges
Reliability Engineering faces the same pressures that are driving the rest of the industry: Faster time to market = shorter test times
Desire for improved accuracy
Tighter budgets demanding reduced test costs
Increased Emphasis on Warranty Cost Reduction
Companies are more aggressively addressing warranty costs
Directly affects bottom line profitability
5
How Can Reliability Engineering Respond?
More accurate FMEA/FMECA to improve reliability and reduce liability risks
Faster results from Accelerated Life Testing (ALT) and Reliability Growth Testing (RGT)
More accurate predictions of warranty costs through better MTTF/MTBF predictions
6
Sherlock, HALT and HASS Can Help
Working together, these design tools will:
Speed time to market
Reduce design cycle time by reducing test time
Reduce test costs by using fewer samples and less lab time
Reduce warranty costs through improved reliability
Minimize long term reliability costs and maximize MTBF with HASS
7 7
Earlier Detection and Correction = $$$
Save time and money when you can push corrective actions back further in design cycle
Finding failures in HALT, before DVT, has always been beneficial
Sherlock pushes fault detection back further, before hardware exists
HALT goes faster with Sherlock implemented first
Faster HALT means moving to HASS faster
The “Rule of Ten” for Error Correction Cost
Reducing Residual Risk
The Cost of Unknowns is… Unknown
Variabilities in supply, intentional or unintentional design changes
Use Sherlock and HALT to evaluate changes
Use HASS to capture undetected variations and keep reliability high
The End Result
New, previously unachievable levels of reliability in shorter time frames.
Catch things you didn’t catch before
SPECIFIC ADVANTAGES BROUGHT BY SHERLOCK
The Power of Multiple Tools
HALT on Complex Multi-Board Assemblies
HALT is most effective when testing lowest possible assembly level Most effective stress on assembly
Sometimes, lower level assemblies can’t be completely functionally tested
Trade-offs are required
HALT on Complex Multi-Board Assemblies
Sherlock can Model Multi-Board Systems
Testing in a non-end use configuration can influence failure modes.
Sherlock models stresses on stacked boards, daughter cards and mezzanine cards
Sherlock can Model Multi-Board Systems
Sherlock can Reduce HALT Costs
Failures found in Sherlock will be eliminated before HALT
Fewer failure modes found in HALT, so fewer samples will be used, less failure analysis to do Particularly helpful with expensive or scarce UUTs
Let Sherlock predict stress levels for catastrophic failure, then avoid them in HALT
Let Sherlock verify corrective actions first Identify possible new failure modes before building new
hardware
Failure Analysis After HALT
One of the most important and time consuming aspects of HALT
Understanding failure modes is essential
As you learned last month, Sherlock can speed failure analysis
Run “what if’s”, evaluate effects of faults quickly to narrow down FA efforts
Found in HALT, Identifiable with Sherlock
Improving Sherlock with HALT Results
Sherlock component models are user customizable
When HALT identifies characteristics not in model, Sherlock can be tuned to improve model
Avg Lower
Operating Limit Avg Lower
Destruct Limit
Avg Upper Operating Limit
Avg Upper Destruct Limit
-48˚C -66˚C 92˚C 108˚C
Limits this far outside of specification may not be reflected in Sherlock models
Average limits found in 47 HALT tests in Qualmark’s ARTC labs
Using Sherlock in HASS Implementation
HASS gives the highest possible benefit from HALT/HASS Technologies
The faster you can get through HALT, and the faster you can get HASS implemented, the more value you get
Sherlock can help speed HASS Proof of Screen Use Sherlock to predict end of life at given HASS stress
If confirmed in test results, fewer cycles and fewer units will be necessary for Proof of Screen
HASS Implementation
Proof of Screen Safety Profile
Sherlock can Provide a Second Opinion on Safety of Screen
Sometimes there are residual concerns about the stresses used in HASS, in spite of the evidence provided by Proof of Screen.
A second source of safety information can help resolve this.
Image credit: HR Morning
Sherlock
HASS
Learn More by Using More Tools
Overall reliability is most improved when all techniques are used
HALT provides operational information that is beyond the capabilities of Sherlock Sherlock evaluates fatigue and end of life due to mechanical
stresses
HALT evaluates operational limits, finds soft failures
HASS provides ongoing confirmation of product reliability
Sherlock is only as good as the model
If a vendor has process issues or uses incorrect or counterfeit components, Sherlock won’t show this
Requires adherence to the little known standard, MIL-TD-1111
Make
It
Like
-
The
Drawing
-
1111 (For Once!)
Gain the Advantage of a Second Check
Two chances to find a design issue BEFORE your customer does!
Use all the Tools at Hand to Make the Best Product Possible
Increased confidence in Sherlock predictions, HALT results and HASS effectiveness
Increased confidence in the reliability of your product
Neill Doertenbach
Senior Applications Engineer
www.qualmark.com
Thank You !
Questions?
