Dedicated Fixtures (wired)
Dedicated fixtures are wired in various fashions to the testes test electronics. The most common method is to wire the fixture test point to a transfer connector. The transfer connector is used to transfer the voltage and current from the fixture to the test machines scan cards. The fixture itself could have sockets at the test point location and a process called wire wrap would wrap a wire around the back side of this socked to the backside of the transfer connector. A wire map would be used to maintain netlist integrity from test pin to machine point. Dedicated fixtures are very labour intensive because of the wiring step, typically making them more expenses than leaning pin fixtures. The number of CNC drilled plates is limited to a few plates.
Other options for dedicated fixtures is to use a socket that has the wire pre-crimped on the socket. This will save a little manufacturing time. The test pins have a build in spring to create upward force on the PCB while under test.
Wires with socket
Dedicated fixtures use thicker medium-priced material to support the weight of the PCB. The connection points of the wires to the test pins limits the pitch of the PCB technology that can be tested on this style of fixture.
Test Pin Length
~ 6 mm
Minimum Pin Size
Minimum Pad Size
Type of Products used on the fixture
Flex, Rigid-Flex, Multilayer, Double side
Expensive, production time is long, test pin diameter limited (0.45 mm)
PCB to Fixture Tooling
Why Gardien’s Solution?
Your Gardien Local Service Centre may offer this service. The AOI tooling and production services are controlled by Gardien’s proprietary job flow system called Ontrack (link to Ontrack). This creates a seamless and error free flow of information from the customer supplied data to the Service Floors at Gardien.
Gardien’s team is trained and qualified on all internal process as documented Quality Management System. The internal process has specific inputs for incoming, certified, and not good boards as well as descriptive educational programs on various board types, and surface finishes.
Gardien certifies each order processed with a Certificate of Compliance with details about how the order was processed, what specifications were used to certify the product, equipment used with calibration expiry date, team member who processed the order, quantity, and failure analysis.
Gardien strongly recommends that the test sequence and parameters are clearly stated on the manufacturing drawing or at a minimum agreed upon during the quoting or contract realization phase. In addition, any PCB sent to us for processing should have a unique identifier on each peace for electronic traceability.