The document discusses selecting the best alternative test (ALT) approach. It outlines several criteria for selection including meaningful results, measures, cost, precision, duration, and samples. Three potential ALT options are presented for a case study of testing capacitors for insulation breakdown: time compression testing, building a model, and step stress testing. The document concludes by stating the selection of the best ALT approach should consider these criteria and options.

1. Determine and Design
the Best ALT
Fred Schenkelberg, Consultant
January 23rd thru 26th, 2012
RAMS Session 13C

2. Selection
Criteria

3. Selection
Criteria
Meaningful Results

4. Selection
Criteria
Meaningful Results
Measures

5. Meaningful Results:
Measures
Surrogate Threshold
Unrelated
Direct

6. Selection
Criteria
Meaningful Results
Measures
Cost

7. Cost
Budget Threshold
Prohibitive
Inexpensive

8. Selection
Criteria
Meaningful Results
Measures
Cost
Precision
Duration
Samples

9. Consider the alternative ways to conduct the testing
ALT APPROACHES

10. Example Case
Capacitor
24/7 operation
High voltage load
Outdoor environment
Insulation breakdown
failure mechanism
Let’s consider some
ALT options

11. Time Compression

12. Build a Model

13. Given a Model
Peck’s
Relationship

14. Step Stress

15. Degradation

16. Example Case
Capacitor
24/7 operation
High voltage load
Outdoor environment
Insulation breakdown
failure mechanism
3 viable ALT options

17. ALT Selection
Select
Assume a
Model

18. Questions?