Calculating Landed Cost Crossover between Flying Probe and Fixture Tooling
Landed cost crossover balances fixture NRE against probe runtime fees, shifting financial advantage to fixtures once batch volume savings offset tooling costs.
Double Sided Clam Shell
Fixture Architecture
Testing hardware architecture describes a mechanical test frame that makes simultaneous contact with both the top and bottom surfaces of a circuit board. The double sided clam shell uses two hinged or parallel plates to align probe pins with test pads on both assembly sides. One pass replaces the need for board inversion.
Contact Mechanics
Precision alignment pins ensure that the top and bottom plates synchronize with the board datum points during closure. When the double sided clam shell closes, it applies balanced pressure to prevent board warping under high probe counts. Clamping mechanisms support high-density assemblies where vertical access to all nets is required for full fault coverage.
Pneumatic or vacuum actuators provide the force needed to overcome probe spring resistance. Sensors often monitor the position of the plates to ensure that the engagement occurs safely without damaging the delicate circuit structures.
Interface Reliability
Maintenance of the internal wiring and probe tips determines the repeatability of the electrical measurements. Because the double sided clam shell houses two sets of probe plates, the complexity of the signal path increases compared to single sided alternatives. Regular cleaning of the contact points prevents false failures caused by flux residue or debris.