Production Quality
Quality assurance procedures applied during sensor manufacturing isolate non-conforming units before final assembly and delivery to customers. Executing sensor batch screening identifies manufacturing defects in silicon dies and internal electrical connections. Automated test stations process complete production lots simultaneously.
Thermal Stress
Environmental screening subjects entire sensor lots to rapid temperature cycling and elevated thermal soaking inside automated test chambers. Thermal stress accelerates early-life infant mortality failures caused by micro-cracks and solder joint voids. Continuous monitoring during thermal cycling detects transient signal output interruptions that static room-temperature testing fails to identify.
Sensors exhibiting excessive zero temperature coefficient shifts or span thermal drift beyond predefined statistical limits get rejected immediately. Screening data feeds back into wafer fabrication and packaging lines to rectify systemic processing defects before subsequent production batches undergo testing.
Statistical Yield
Statistical process control charts track key parameters such as offset voltage, bridge resistance and full-scale sensitivity across manufacturing runs. Bimodal distributions in parameter plots indicate lot contamination, material variation or tool wear on the assembly line. Yield analysis calculates the percentage of compliant sensors per silicon wafer, establishing baseline manufacturing capability.
Tracking yield metrics prevents defective sub-components from entering final calibration cycles.
Acceptance Limit
Screening specifications enforce tighter parameter tolerances than published customer datasheet limits to ensure long-term field stability. Margin allocation accounts for assembly stresses incurred during secondary encapsulation and cable attachment processes. Quality control engineers sign compliance reports before releasing screened sensor batches to inventory.
