How do you calculate good final test capacity?

Multiply devices per cycle by planned cycles for gross capacity, then multiply by uptime and first-pass yield. With 4 devices/cycle, 96 cycles, 88% uptime, and 97% yield you get 327.78 good devices from 384 gross.

What is the difference between gross and good test capacity?

Gross capacity (384 devices) is what the station would produce running flawlessly. Good capacity (327.78) subtracts downtime loss (46.08 devices) and yield loss (10.14 devices) to give what you can actually release.

How much capacity does downtime cost on a final test station?

At 88% uptime the station loses about 46 devices of capacity in this scenario — 12% of the gross 384. Lifting uptime to 95% would recover roughly 27 of those devices.

What is a good first-pass yield for implantable final electrical test?

Mature implantable final-test FPY typically runs 96-99%. The 97% here is solid; each point of yield loss costs about 3.8 devices on a 384-device gross plan.

Does this account for retest of failed devices?

No — it reports first-pass good devices only. If you recover failures through retest or rework, releasable output rises above 327.78, but those devices carry extra labor and a traceability note.

Which loss should I attack first, uptime or yield?

Here downtime loss (46.08 devices) dwarfs yield loss (10.14), so improving station availability returns more good devices than chasing the last yield point. Always compare the two loss lines before investing.

Implantable Electronics & Neurodevices calculator

Final Electrical Test Capacity Calculator

Final electrical test is the last functional gate before an implantable device is sterilized and released — impedance, current draw, telemetry, and stimulation parameters all verified on a fixtured station. This calculator turns fixture multiplicity and planned cycles into gross capacity, then derates it by station uptime and first-pass yield to give the good-device count you can actually ship. Test engineers and production planners use it to commit realistic final-test output and to see exactly how much capacity downtime and yield fallout are stealing. For low-volume, high-value neurodevices, every device lost to a yield or uptime gap is expensive, so quantifying both losses sharpens where to invest.

What this calculator does

Estimate good implantable devices per shift from tester throughput, planned cycles, uptime, and first-pass yield.
Use it when test engineering or production control needs to know whether final electrical or functional test capacity can cover a release plan.
It computes the number of good, releasable devices a final electrical test station produces after uptime and first-pass yield losses.

Formula used

Gross final electrical test capacity = devices tested per fixture cycle × planned final test cycles
Good final electrical test capacity = gross capacity × final test station uptime × final electrical test first-pass yield

Inputs explained

Devices tested per fixture cycle:
Planned final test cycles:
Final test station uptime:
Final electrical test first-pass yield:

How to use the result

Use it when committing final-test throughput for a build plan or when sizing the impact of a yield or downtime improvement.
It models first-pass yield only; if your process relies on retest or rework to recover failed devices, true releasable output will differ from the first-pass figure.

Current U.S. benchmarks

The producer price index for copper and brass mill shapes stands at 559.593 (BLS, May 2026), up 76.8% from a year earlier. Quotes priced off last quarter's material cost miss this move. Global copper trades at $13,484 per tonne (IMF via FRED, May 2026).
U.S. manufacturing runs at 75.6% of capacity with new factory orders at $657B per month (Federal Reserve and Census, May 2026).
The U.S. has 11,261 computer and electronic products establishments employing about 815,443 workers (Census County Business Patterns, 2023).

Common questions

How do you calculate good final test capacity? Multiply devices per cycle by planned cycles for gross capacity, then multiply by uptime and first-pass yield. With 4 devices/cycle, 96 cycles, 88% uptime, and 97% yield you get 327.78 good devices from 384 gross.
What is the difference between gross and good test capacity? Gross capacity (384 devices) is what the station would produce running flawlessly. Good capacity (327.78) subtracts downtime loss (46.08 devices) and yield loss (10.14 devices) to give what you can actually release.
How much capacity does downtime cost on a final test station? At 88% uptime the station loses about 46 devices of capacity in this scenario — 12% of the gross 384. Lifting uptime to 95% would recover roughly 27 of those devices.
What is a good first-pass yield for implantable final electrical test? Mature implantable final-test FPY typically runs 96-99%. The 97% here is solid; each point of yield loss costs about 3.8 devices on a 384-device gross plan.
Does this account for retest of failed devices? No — it reports first-pass good devices only. If you recover failures through retest or rework, releasable output rises above 327.78, but those devices carry extra labor and a traceability note.

Last reviewed 2026-05-12.