Appliance Electronics & Control Boards worked example

Functional Test Yield Calculator at 99% target first-pass functional yield: a worked example

This scenario runs the functional test yield calculator calculation on the strong side: 99% target first-pass functional yield, with every other input held at its documented default. a quality or test engineer needs to track first-pass functional test performance on appliance electronic assemblies

The inputs for this scenario

  • Boards passed functional test: 4,720 boards (unchanged)
  • Total appliance boards tested: 5,000 boards (unchanged)
  • Target first-pass functional yield: 99 % (raised for this scenario; the documented default is 97)

Working through the calculation

  • Applying the documented formula (First-pass functional test yield = boards passed functional test ÷ total appliance boards tested × 100) to the inputs above produces each figure below.
  • At this operating point the engine returns 94.4 % for first-pass functional test yield, the number this scenario is built around.
  • At this operating point the engine returns 4.6 points for yield gap to target.
  • At this operating point the engine returns 4,720 boards for boards passed functional test.
  • At this operating point the engine returns 5,000 boards for total appliance boards tested.

How this compares with the baseline

  • Against the tool's baseline example, where target first-pass functional yield sits at 97% and the headline result is 94.4 %, this scenario lands almost exactly on the baseline at 94.4 %.
  • Use it at end of shift or end of lot to gauge functional test performance on a control board line and flag when you are drifting under your committed yield. 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

  • First-pass functional test yield: 94.4 % (headline result)
  • Yield gap to target: 4.6 points
  • Boards passed functional test: 4,720 boards
  • Total appliance boards tested: 5,000 boards

Run it with your numbers

  • Every input above is editable in the live Functional Test Yield Calculator calculator, which recalculates instantly and can be shared with the inputs intact.

Last reviewed 2026-05-12.