What does a zero-failure RDT demonstrate?
If all planned units pass, the calculation gives the one-sided confidence statement associated with the selected reliability target and sample size.
Reliability Toolkit
Reliability Demonstration Test (RDT) Sample Size & Test Time Calculator
Build a binomial reliability demonstration plan for zero or allowable failures. Use the non-parametric method for a fixed mission-duration pass/fail test, or the Weibull modes to trade sample count against test duration.
How to use it
Inputs that remain auditable.
- 01
Set the reliability and one-sided confidence target.
- 02
Choose how many failures the acceptance plan will allow.
- 03
For Weibull modes, enter mission time, beta and either available test time or sample count.
Questions
Frequently asked
Can longer test time reduce sample size?
Yes when a justified life model such as Weibull is used. Longer testing reduces the survival probability at the test duration, which can reduce the required sample count.