How do you calculate good test station capacity?

Multiply assemblies per cycle by available cycles for gross capacity, then multiply by uptime and first-pass yield. Here 4 x 480 = 1,920 gross, x 0.88 x 0.96 = about 1,622 good units.

Why is good capacity lower than gross capacity?

Gross assumes 100% uptime and perfect yield. With 88% uptime you lose 230 units to downtime, and 96% first-pass yield costs another 68 units to retest, dropping 1,920 gross to roughly 1,622 good units.

What is a good first-pass yield for optical test?

Mature insertion-loss and return-loss test lines often run 95-99% first pass; 96% is solid but not exceptional. Every point below that both scraps or reworks units and clogs the station with retests.

Should I improve uptime or yield first?

Compare the loss columns. Here uptime loss (230 units) is larger than yield loss (68 units), so chasing station availability — calibration, fixture changeovers, lamp warmup — returns more capacity than a yield project.

Does first-pass yield include units that pass on retest?

No. First-pass yield counts only units good on the first measurement. Retested-good units still occupy the station, so plan extra test time for the retest loop beyond the 1,622 good-unit figure.

How do I convert this into stations needed?

Divide demand by good capacity per station. If you need 3,200 good tests and one station yields 1,622, you need two stations — one cannot keep up even though gross capacity (1,920) looks close.

Fiber Optic Cable & Photonic Interconnects calculator

Test Station Capacity Calculator

Test Station Capacity tells you how many good fiber assemblies an optical test station can actually deliver once uptime and first-pass yield are accounted for — not the theoretical maximum. Test engineers and production planners use it because optical test (insertion loss, return loss, interferometry) is frequently the true bottleneck in photonic interconnect manufacturing, where a single station gates the whole line. Gross cycle counts always overstate output; this calculator strips out downtime and retest losses so you plan against real good-unit throughput. It also shows where capacity bleeds away, which is where you focus improvement effort.

What this calculator does

Estimate good optical test station output from assemblies per cycle, available test cycles, station uptime, and first-pass test yield.
Use it when checking capacity for insertion loss, return loss, polarity, continuity, interferometry, or transceiver optical test stations.
It computes good output capacity from cycle output, available cycles, station uptime, and first-pass yield, and breaks out uptime loss and retest/yield loss separately.

Formula used

Gross optical test capacity = assemblies tested per cycle × available optical test cycles
Good optical test capacity = gross capacity × station uptime × first-pass optical test yield

Inputs explained

Assemblies tested per optical test cycle:
Available optical test cycles per period:
Optical test station uptime:
First-pass optical test yield:

How to use the result

Use it when scheduling test capacity against demand, justifying a second test station, or finding which loss to attack first.
It models first-pass yield only — assemblies that pass after retest still consume station time, so a low first-pass yield understates the true time burden unless you account for the retest queue separately.

Current U.S. benchmarks

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Common questions

How do you calculate good test station capacity? Multiply assemblies per cycle by available cycles for gross capacity, then multiply by uptime and first-pass yield. Here 4 x 480 = 1,920 gross, x 0.88 x 0.96 = about 1,622 good units.
Why is good capacity lower than gross capacity? Gross assumes 100% uptime and perfect yield. With 88% uptime you lose 230 units to downtime, and 96% first-pass yield costs another 68 units to retest, dropping 1,920 gross to roughly 1,622 good units.
What is a good first-pass yield for optical test? Mature insertion-loss and return-loss test lines often run 95-99% first pass; 96% is solid but not exceptional. Every point below that both scraps or reworks units and clogs the station with retests.
Should I improve uptime or yield first? Compare the loss columns. Here uptime loss (230 units) is larger than yield loss (68 units), so chasing station availability — calibration, fixture changeovers, lamp warmup — returns more capacity than a yield project.
Does first-pass yield include units that pass on retest? No. First-pass yield counts only units good on the first measurement. Retested-good units still occupy the station, so plan extra test time for the retest loop beyond the 1,622 good-unit figure.

Last reviewed 2026-05-12.