Lab Equipment & Scientific Instrument Manufacturing worked example

Final Acceptance Test Time at 23% setup and re-test allowance: a worked example

This scenario runs the final acceptance test time calculation on the strong side: 23% setup and re-test allowance, with every other input held at its documented default. Use when scheduling FAT for a production batch, estimating test engineer workload for the week, or calculating whether your test team can clear a backlog before the shipping deadline. Critical for instruments requiring multi-hour burn-in, soak tests, or multi-point performance verification.

The inputs for this scenario

  • Instruments to test: 15 instruments (unchanged)
  • Test completion rate: 1 instruments / hr (unchanged)
  • Setup and re-test allowance: 23 % (raised for this scenario; the documented default is 20)

Working through the calculation

  • Applying the documented formula (Base test time = instruments to test / test completion rate) to the inputs above produces each figure below.
  • At this operating point the engine returns 18.45 hr for scheduled fat labor, the number this scenario is built around.
  • At this operating point the engine returns 15 hr for base test time.
  • At this operating point the engine returns 23 % for setup and re-test allowance applied.
  • At this operating point the engine returns 1 pieces / min for test completion rate.

How this compares with the baseline

  • Against the tool's baseline example, where setup and re-test allowance sits at 20% and the headline result is 18 hr, this scenario comes in 2.5% above the baseline at 18.45 hr.
  • Use it when planning a test cell for a production batch or quoting lead time that includes the acceptance-test stage. 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

  • Scheduled FAT labor: 18.45 hr (headline result)
  • Base test time: 15 hr
  • Setup and re-test allowance applied: 23 %
  • Test completion rate: 1 pieces / min

Run it with your numbers

  • Every input above is editable in the live Final Acceptance Test Time calculator, which recalculates instantly and can be shared with the inputs intact.

Last reviewed 2026-05-12.