OVERVIEW of Polycarbonate Test Fixture Blanks |
Polycarbonate Test Fixtures and G-10/FR4 Test Fixtures are used in the testing of printed circuit boards. In ATE fixtures, these polycarbonate blanks are drilled in a specific pattern to match the circuit design and layout of the PCB. Professional Plastics offers pre-cut polycarbonate blanks for test fixtures used primarily in "Bed of Nails Testers".
In ATE equipment, the most popular test method is "pin-based testers" using a fixture called a "Bed of Nails". The first generation bare board testing machines used fixtures and tooling, dedicated for everyboard design The test technique, known as the ' bed of nails' testing, consists of a bed of spring-loaded probes, each one connected to its own electronic circuitry arrayed on a matrix of 0.10" grid. Dedicated fixtures are made with a top plate drilled with the personality of the PWB and the bottom plate interfacing with the tester, with each test pin wire wrapped to a contact point on the bottom fixture.
The individual pins or "nails" as they are called, do not flex under load the nearest spring-loaded probe below will never be more than 0.07" away requiring an attitude of less than two degreesfrom the vertical. This type of fixture can be dismantled at will and with the exception of the top plate unique to the board under test, and is totally re-usable. The nails and probes are pointed and gold plated for good contact. The springs are designed to obtain optimum contact pressure.The bare board testing has since evolved itself in fixture design, ability to work on finer pitches than 0.01".
For More Details on Bed of Nails Test Fixture Design & Materials, Click Here
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FEATURES AND BENEFITS of Polycarbonate Test Fixture Blanks |
Test Fixtures may be produced from a variety of subtsrates depending on customer requirements.
Common substrates include Polycarbonate, Acrylic, G-10/FR4.
Test Fixtures are typically used in conjuction with a Support Plate (aka Riser Plate). Support Plates are commonly manufactured from substrates such as Paper Phenolic, G-10/FR4 or Conductive FR4 depending on specific requirements.
Support Plates are commonly utilized on equipment from Teradyne, Genrad, Agilent, Check Sum, TRI, TTI, ECT and Functional
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![Polycarbonate Test Fixture Blanks]( "Polycarbonate Test Fixture Blanks")
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