Environmental Test Chambers & Reliability Labs worked example

HASS Capacity at 65% hass chamber uptime: a worked example

Here is what the math looks like when conditions slip. We hold every other input steady and drop hass chamber uptime to 65%, then walk the calculation through step by step. Estimate HASS screening capacity from units per screening load, available HASS loads, chamber uptime, and first-pass screen completion.

The inputs for this scenario

  • Units per HASS load: 36 units / load (held at the documented default)
  • Available HASS loads: 22 loads (held at the documented default)
  • HASS chamber uptime: 65 % (the input this scenario stresses; the baseline uses 90)
  • First-pass screen completion: 96 % (held at the documented default)

Working through the calculation

  • The calculation starts from the formula this tool documents: Gross HASS capacity = units per HASS load × available HASS loads.
  • Completed HASS units works out to 494 units at these inputs, and this is the headline figure for the scenario.
  • Gross HASS screening capacity works out to 792 units at these inputs.
  • HASS units lost to chamber downtime works out to 277 units at these inputs.
  • HASS units requiring rerun works out to 20.59 units at these inputs.

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 27.78% below the baseline at 494 units.
  • The practical read: the gap between this scenario and the baseline is entirely attributable to hass chamber uptime, so recovering it is worth quantifying in dollars before considering equipment or staffing changes. 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: 494 units (headline result)
  • Gross HASS screening capacity: 792 units
  • HASS units lost to chamber downtime: 277 units
  • HASS units requiring rerun: 20.59 units

Run it with your numbers

  • To rerun this with your own numbers, open the live HASS Capacity calculator, set hass chamber uptime to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.