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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/RQ100/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.

Probe Plate ​

  • Design the probe plate with cutouts to avoid interference with tall components on the DUT. The Dev Pro's parallel stroke mechanism requires clearance planning to prevent binding during fixture closure.

Fixture Assembly Instructions ​

DUT Mating Height ​

  • Position the DUT so that its bottom surface is 11.22mm 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.

DUT Mate

Key Differences from Dev Fixtures ​

  • Guide Pins: GP-2TL instead of GP-2UL
  • Pressure Pins: 35mm instead of 45mm
  • Receptacles/Probes: Centalic PQ50/PQ100/PE75 series instead of generic options
  • DUT Height: ~11mm above probe plate (vs 3.5mm for Dev fixtures)
  • Typical cycle life: 1,000 (Dev) vs 10,000+ with a G10 cartridge (Dev Pro)

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