When a connected device startup moved from prototype to production, they faced a common challenge: their informal testing approach couldn't scale with demand. Here's how they solved it.
The Challenge#
The company had built an innovative IoT sensor platform. During development, they tested each board manually using flying probe and bench equipment. As orders grew from dozens to thousands of units, this approach broke down:
- Test cycle time exceeded 15 minutes per board
- Defect escape rate was climbing
- Test technicians were the bottleneck
The Hidden Cost
They calculated that manual testing was adding $12 per unit in labor costs—more than the savings from avoiding fixtures during development.
The Solution#
The engineering team implemented a phased approach:
Phase 1: Dev Fixture for NPI#
For their first production build of 500 units, they started with a Dev fixture. This allowed them to:
- Validate their test point layout in practice
- Develop test programs with realistic probe contact
- Achieve 94% test coverage
Phase 2: Dev Pro for Growth#
As monthly volume reached 2,000 units, they upgraded to Dev Pro fixtures with enhanced durability. Test cycle time dropped to 45 seconds.
Phase 3: Production for Scale#
When they secured a major customer order, they deployed Production fixtures with automated handling. The fixtures integrated with their assembly line, enabling 24/7 testing.
The Results#
After full implementation:
| Metric | Before | After |
|---|---|---|
| Test cycle time | 15 min | 45 sec |
| Defect escape rate | 2.1% | 0.08% |
| Test labor cost/unit | $12.00 | $0.45 |
| Monthly capacity | 500 | 15,000 |
Key Takeaways#
The company's success came from:
- Starting early: Investing in fixtures during NPI rather than waiting
- Scaling incrementally: Matching fixture tier to actual production volume
- Planning for automation: Choosing fixtures compatible with their test handler roadmap
- Maintaining coverage: Ensuring test point access across design revisions
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