Engineering Hours Hidden inside a Unit Price Quotation
Unbundling hidden engineering hours from unit quotations exposes true manufacturing costs, restores IP ownership, and prevents locked-in margin erosion.
Test Fixture
Meaning
Custom electro-mechanical assembly designed to hold, position and interface printed circuit assemblies with automated test equipment during manufacturing verification testing. Construction of a test fixture incorporates spring-loaded pogo pins, mechanical clamps and RF shielding enclosures to form reliable electrical connections with PCB test points. Test operators place assembled boards into fixtures for rapid functional verification.
Contact Mechanism
Pogo pin interfaces press against exposed copper test pads on the circuit board to transfer power and high-speed data signals. Operating a test fixture requires precise mechanical clamping force to establish low-resistance electrical connections across dozens of contact points simultaneously. Wear on pogo pins requires scheduled maintenance and pin replacement routines.
Pin Alignment
Fixture bed-of-nails plates require precision CNC machining to match PCB test pad coordinates accurately. Using a custom test fixture ensures consistent electrical contact without damaging delicate component leads or copper trace surfaces. Mechanical guide pins position target boards within sub-millimeter tolerances prior to clamp engagement.
Shielded fixture cavities isolate wireless units from ambient factory RF noise during sensitive receiver sensitivity measurements.
Production Throughput
Automated fixture mechanisms reduce test setup time from minutes to seconds per unit, accelerating factory throughput. Automated pass and fail indicators direct operators to route passing units to final packaging while flagging failed boards for engineering diagnostic rework. Mass production lines deploy duplicate fixtures to match SMT placement capacity.