Environmental Test Chambers & Reliability Labs worked example

Fixture Loading at 99% instrumentation channel availability: a worked example

Push instrumentation channel availability up to 99% and the picture changes. This example computes every intermediate figure at that operating point. a chamber operator needs to know how many samples fit the fixture and instrumentation setup

The inputs for this scenario

  • Sample positions per fixture set: 16 samples / fixture (unchanged)
  • Fixture sets available: 4 fixtures (unchanged)
  • Instrumentation channel availability: 99 % (raised for this scenario; the documented default is 88)
  • Setup success yield: 95 % (unchanged)

Working through the calculation

  • Applying the documented formula (Gross fixture loading = sample positions per fixture set × fixture sets available) to the inputs above produces each figure below.
  • At this operating point the engine returns 60.19 samples for usable fixture loading capacity, the number this scenario is built around.
  • At this operating point the engine returns 64 samples for gross fixture positions.
  • At this operating point the engine returns 0.64 samples for positions lost to unavailable channels.
  • At this operating point the engine returns 3.17 samples for positions lost during setup.

How this compares with the baseline

  • Against the tool's baseline example, where instrumentation channel availability sits at 88% and the headline result is 53.5 samples, this scenario comes in 12.5% above the baseline at 60.19 samples.
  • It computes the usable number of monitored samples per chamber load after derating gross fixture positions for instrumentation channel availability and setup yield. The value of this scenario is the size of the gap it exposes: that gap, priced out over a year, is the budget you can justify spending to close it.

Results at a glance

  • Usable fixture loading capacity: 60.19 samples (headline result)
  • Gross fixture positions: 64 samples
  • Positions lost to unavailable channels: 0.64 samples
  • Positions lost during setup: 3.17 samples

Run it with your numbers

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

Last reviewed 2026-05-12.