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Difference Between Fixture (Bed of Nails) and Flying Probe Testing

Sometimes customers are unclear about the difference between Fixture (Bed of Nails) vs Flying probe testing, as well as the costs associated with them. The following example will clarify the difference between the two methods, as well as the cases in which one or the other might yield a more efficient PCB assembly process.For this example,
Difference Between Fixture (Bed of Nails) and Flying Probe Testing
22 May 2024
Views: 319
POE performs 100%electrical testing on all bare pcb's produced. Itsfacilities are in accordance with IPC-9252specifications.We either use the Bedof Nails Fixture methodor the Flying Probemethod to perform thetesting in our circuitboard manufacturingprocess.

Depending upon both the design and the cost, our testing methodology will either be:
1. The Bed of Nails Fixture Method = Mass Production PCBs;
2. The Flying Probe Method = Samples and Prototypes PCBs.

Difference Between Fixture (Bed of Nails) and Flying Probe Testing

Sometimes customers are unclear about the difference between Fixture (Bed of Nails) vs Flying probe testing, as well as the costs associated with them. The following example will clarify the difference between the two methods, as well as the cases in which one or the other might yield a more efficient PCB assembly process.For this example,


let' s assume there are 3,500 test points with 750 nets installed.

E-Test Fixtures (bed of nails)
(All points are tested simultaneously)
Flying Probe
(All points are tested simultaneously, however, this process involves both setup time to create the fixture and additional costs associated with the cost of materials.)
Electrical test pitch = 0.020" Electrical test pitch = 0.040"
Setup time: 30 minutes Setup time: 0 minutes
Learn time: 0 minutes Learn time: 20 minutes
Debug/ check for missing pins: 10 minutes Test time per board: 6 minutes
Test time per board: 40 seconds Test time per board: 40 seconds

The points are tested one at a time. There is no setup time because the machine learns the program as it operates.
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