Piezo Sensor Project

When an internationally known producer of sensors came to CheckSum with a challenging test requirement, we were ready.  The company produces sensors of all kinds but this particular product does not lend itself to traditional bed-of-nails testing.

The product is a piezoelectric film sensor, produced on sheets 32 micrometres thick (less than .002”) with over 300 units per sheet.  CheckSum’s challenge was to probe the material from both sides using standard probes without damaging the material, while accurately measuring resistances down to .05 Ohms and capacitances of 150 pF.

Additional requirements were an automated barcode scanner and the equipment needed to operate within a clean room environment.

CheckSum’s team of electrical and mechanical engineers got to work designing a pneumatic fixture for our standard 12KN press, with the addition of pneumatically actuated tooling pins to ensure the sheets were not damaged through the process of testing.   Each circuit required 2 probes on each side and each probe was 4-wired to obtain the accuracy required for the measurements.

The 507-unit sheet and the 312-unit sheet tested in under 10 seconds using CheckSum’s V12 system card, the fastest ICT hardware on the market.

The typical vacuum bed-of-nails approach favored by the industry would have been next to impossible to use without damaging the sensitive film, not to mention being costly.  CheckSum’s combination of a pneumatic fixture press and in-house fixturing expertise made the project possible.  We worked closely with customer engineers throughout the development phase so that when the equipment was complete, the checkout phase went smoothly.

What testing challenges do you need to be solved for your product?  Contact our team today!