Meaning
Testing apparatus for printed circuit board assemblies utilizes a grid of spring-loaded pogo pins to make simultaneous contact with multiple test points. A bed of nails jig allows for high-speed electrical verification of traces and component placement without requiring manual probing. The boundary of the test is limited to the physical reach of the pin array and the availability of landing pads on the substrate.
Mechanical Interface
Alignment plates ensure the board under test lands precisely on the pin array. This mechanical interface of the bed of nails jig must resist the cumulative force of hundreds of springs to prevent board flexing. Custom drilling patterns match the specific layout of the board to be verified.
Contact Reliability
Surface finish on the board pads determines how well the pins penetrate oxidation. The contact reliability of the bed of nails jig varies with pin tip geometry such as pointed, crown, jagged, or flat. Regular cleaning cycles remove solder flux residue that would otherwise increase resistance at the probe point.
Maintenance logs track the total strike count for each pin to predict failure before it causes false negatives.
Production Throughput
Speed depends on the time required for a vacuum or pneumatic press to engage the assembly. The production throughput of the bed of nails jig remains superior to flying probe testers in high-volume environments. One fixture handles thousands of boards per week.