Environmental Test Chambers & Reliability Labs worked example

HASS Capacity at 99% hass chamber uptime: a worked example

What does the result look like when hass chamber uptime reaches 99%? The full calculation is worked below with real intermediate numbers. a lab scheduler needs to check whether HASS screening capacity covers the build plan

The inputs for this scenario

  • Units per HASS load: 36 units / load (unchanged)
  • Available HASS loads: 22 loads (unchanged)
  • HASS chamber uptime: 99 % (raised for this scenario; the documented default is 90)
  • First-pass screen completion: 96 % (unchanged)

Working through the calculation

  • Applying the documented formula (Gross HASS capacity = units per HASS load × available HASS loads) to the inputs above produces each figure below.
  • At this operating point the engine returns 753 units for completed hass units, the number this scenario is built around.
  • At this operating point the engine returns 792 units for gross hass screening capacity.
  • At this operating point the engine returns 7.92 units for hass units lost to chamber downtime.
  • At this operating point the engine returns 31.36 units for hass units requiring rerun.

How this compares with the baseline

  • Against the tool's baseline example, where hass chamber uptime sits at 90% and the headline result is 684 units, this scenario comes in 10% above the baseline at 753 units.
  • A figure at this level is achievable when hass chamber uptime is genuinely sustained, not just peaked for a shift. It assumes uptime and first-pass completion are stable averages; a process excursion that spikes failures or a chamber fault mid-shift will move actual throughput off the estimate.

Results at a glance

  • Completed HASS units: 753 units (headline result)
  • Gross HASS screening capacity: 792 units
  • HASS units lost to chamber downtime: 7.92 units
  • HASS units requiring rerun: 31.36 units

Run it with your numbers

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

Last reviewed 2026-05-12.