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Dev-Pro Fixture Design Guidelines ​

This page provides best practices and component recommendations for building reliable Dev-Pro series test fixtures. Follow these guidelines to ensure optimal performance, ease of assembly, and cost-effectiveness.

Guide Pins ​

  • GP-2TL guide pins are the preferred method for accurately locating the DUT (Device Under Test) within the fixture.
  • If the DUT's locating holes are smaller than 3mm (minimum 2.5mm), use a custom cradle for positioning.
    • Cradles should be mounted to GP-2TL guide pins using M3 screws for secure and repeatable placement.

Pressure Pins ​

  • Use 35mm pressure pins for all Dev-Pro fixtures.
  • Pressure pins are attached to the pressure plate with M3 x 10mm screws, providing consistent downward force on the DUT.

Receptacles and Probes ​

  • Centalic PQ50/PQ100/PE75 probes and the corresponding RQ50/RQ1200/RE75 receptacles are recommended for Dev-Pro fixtures.
  • Probe tip selection:
    • Use "B" tips for standard test points.
    • Use "A" tips for populated through-hole connections.
    • Star type probes from Ingun are also supported for specialized applications.

Fixture Assembly Instructions ​

DUT Mating Height ​

  • Position the DUT so that its bottom surface is 13mm Z offset to place the DUT at the "working stroke" when the fixture is closed.
  • The working stroke positioning ensures optimal probe contact and pressure distribution across the DUT.
  • Use a mounting or tooling hole on the DUT for precise and repeatable alignment.

Key Differences from Dev Fixtures ​

  • Guide Pins: GP-2UL instead of sGP-2U
  • Pressure Pins: 35mm instead of 45mm
  • Receptacles/Probes: Centalic PQ50/PQ100/PE75 series instead of generic options
  • Z Offset: 13mm offset for optimal working stroke positioning
  • DUT Height: 16.5mm above probe plate (vs 3.5mm for Dev fixtures)

By following these recommendations, you can achieve robust, repeatable, and high-performance Dev-Pro fixture assemblies optimized for professional testing applications.