An electrical test fixture is a critical component within the Quality Verification Module that provides mechanical support and establishes reliable electrical connections between the device under test (DUT) and automated test equipment (ATE). It ensures precise alignment and consistent contact for accurate measurement of electrical parameters such as voltage, current, resistance, and signal integrity during quality control inspections. The fixture is designed for use in computer, electronic, and optical product manufacturing, where it facilitates the testing of printed circuit boards, electronic modules, and other assemblies. It is a part-level component, meaning it is a discrete unit that can be integrated into larger test systems. The fixture typically consists of a housing, a PCB substrate, and precision contact pins. The housing is commonly made of aluminum alloy, providing structural rigidity and protection. The PCB substrate, often FR-4, routes signals between the DUT and external test instruments. Contact pins are typically made of phosphor bronze, offering good conductivity and wear resistance. The fixture operates by aligning contact pins with test points on the DUT and applying controlled pressure to establish electrical continuity. This enables automated testing of circuit functionality, performance specifications, and defect detection. Key parameters include contact resistance (≤50 mΩ), insulation resistance (≥100 MΩ at 500 V DC), dielectric withstand voltage (1500 V AC for 1 minute), current rating (10–30 A per contact), operating temperature (-40 to 85 °C), humidity range (5–95% RH non-condensing), ingress protection (IP54–IP65 per IEC 60529), contact force (0.5–2.0 N per contact), cycle life (100,000–500,000 cycles), positioning accuracy (±0.05 mm), and fixture weight (5–20 kg). The frame material is aluminum 6061 per ASTM B209, while contacts are beryllium copper. These values are reference ranges and must be verified for the specific model and application. Always confirm model-specific values and standards with the legal manufacturer or supplier.
The fixture uses precision-machined contact pins or probes that align with test points on the DUT. When the DUT is loaded, the fixture applies controlled pressure to establish electrical continuity. It routes signals between the DUT and external test instruments through internal wiring, enabling automated testing of circuit functionality, performance specifications, and defect detection. The contact force is typically 0.5–2.0 N per contact, ensuring reliable connection without damaging the DUT. The fixture's positioning accuracy of ±0.05 mm ensures precise alignment. The design allows for repeated use, with a cycle life of 100,000–500,000 mechanical operations. The fixture operates within a temperature range of -40 to 85 °C and humidity range of 5–95% RH non-condensing. The ingress protection rating of IP54–IP65 provides dust and water resistance. The fixture's weight ranges from 5 to 20 kg, depending on size and material. The frame is made of aluminum 6061, and contacts are beryllium copper, offering good conductivity and durability.
