Environmental Test Chambers & Reliability Labs worked example

Combined Environment Capacity at 94% combined system uptime: a worked example

This scenario runs the combined environment capacity calculation on the strong side: 94% combined system uptime, with every other input held at its documented default. a reliability lab manager needs capacity for combined temperature-vibration or multi-stress testing

The inputs for this scenario

  • Samples per combined-environment run: 10 samples / run (unchanged)
  • Available combined-environment runs: 14 runs (unchanged)
  • Combined system uptime: 94 % (raised for this scenario; the documented default is 82)
  • Usable completion yield: 90 % (unchanged)

Working through the calculation

  • Applying the documented formula (Gross combined-environment capacity = samples per run × available runs) to the inputs above produces each figure below.
  • At this operating point the engine returns 118 samples for usable combined-environment capacity, the number this scenario is built around.
  • At this operating point the engine returns 140 samples for gross combined-environment sample capacity.
  • At this operating point the engine returns 8.4 samples for samples lost to combined-system downtime.
  • At this operating point the engine returns 13.16 samples for samples without usable completion.

How this compares with the baseline

  • Against the tool's baseline example, where combined system uptime sits at 82% and the headline result is 103 samples, this scenario comes in 14.63% above the baseline at 118 samples.
  • Use it when committing combined-environment throughput for a qualification or HASS screening program, or when sizing how many runs a campaign needs. Treat this as a target state: the delta against the baseline quantifies what the improvement is worth before you commit to chasing it.

Results at a glance

  • Usable combined-environment capacity: 118 samples (headline result)
  • Gross combined-environment sample capacity: 140 samples
  • Samples lost to combined-system downtime: 8.4 samples
  • Samples without usable completion: 13.16 samples

Run it with your numbers

  • Every input above is editable in the live Combined Environment Capacity calculator, which recalculates instantly and can be shared with the inputs intact.

Last reviewed 2026-05-12.