Productivity Rate
Manufacturing performance rate characterizes the hourly volume of units processed by an inspection station. The test cell throughput depends on the raw cycle time of the equipment, the handling time for loading parts, and the percentage of time the system is operational. This value defines the capacity of the final inspection stage in a semiconductor fabrication facility.
Operational Variables
Total output is influenced by both the speed of the test program and the mechanical reliability of the robotic handlers. If the test cell throughput is limited by the duration of the electrical measurement, the process is described as being tester bound.
Utilization Factor
Unscheduled maintenance and operator breaks reduce the actual production rate below the theoretical maximum. Calculated as the ratio of actual units to the maximum possible units, this factor helps managers identify bottlenecks by considering the raw cycle time, the handling time, the repair time, and the percentage of operational uptime.
Performance Scaling
Parallel testing allows for a dramatic increase in the test cell throughput without requiring faster individual measurements. By testing four or eight devices at once on a single platform, the facility reduces the cost per unit and maximizes the return on investment for the expensive instrumentation. This strategy requires a reliable handler that can manage multiple contact points simultaneously without sacrificing the accuracy of the electrical connections.
