Appliance Electronics & Control Boards worked example

ICT Test Capacity Calculator at 99% ict tester uptime: a worked example

Push ict tester uptime up to 99% and the picture changes. This example computes every intermediate figure at that operating point. a test engineer or production planner needs to verify whether ICT fixtures can keep up with PCB assembly output

The inputs for this scenario

  • Boards tested per ICT fixture cycle: 2 boards/cycle (unchanged)
  • Available ICT fixture cycles: 1,250 cycles/shift (unchanged)
  • ICT tester uptime: 99 % (raised for this scenario; the documented default is 90)
  • First-pass ICT yield: 96 % (unchanged)

Working through the calculation

  • Applying the documented formula (Gross ICT board capacity = boards tested per fixture cycle × available ICT fixture cycles) to the inputs above produces each figure below.
  • At this operating point the engine returns 2,376 boards/shift for usable ict test capacity, the number this scenario is built around.
  • At this operating point the engine returns 2,500 boards/shift for gross ict board capacity.
  • At this operating point the engine returns 25 boards/shift for boards lost to tester downtime.
  • At this operating point the engine returns 99 boards/shift for boards held for debug or retest.

How this compares with the baseline

  • Against the tool's baseline example, where ict tester uptime sits at 90% and the headline result is 2,160 boards/shift, this scenario comes in 10% above the baseline at 2,376 boards/shift.
  • It computes good tested boards per shift by multiplying boards per fixture cycle by available cycles, then derating for tester uptime and first-pass ICT 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 ICT test capacity: 2,376 boards/shift (headline result)
  • Gross ICT board capacity: 2,500 boards/shift
  • Boards lost to tester downtime: 25 boards/shift
  • Boards held for debug or retest: 99 boards/shift

Run it with your numbers

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

Last reviewed 2026-05-12.