Meaning
Automated RF testing systems rely on switches and routed cables to connect multiple measurement instruments to a single device under test. The signal matrix loss represents the cumulative attenuation of the high-frequency signal as it passes through these switches and cables.
Calibration Routine
Compensation for this routing attenuation is achieved by measuring the path loss across all frequency bands before production begins. During calibration, the signal matrix loss is recorded for every path in the switch network to generate a lookup table. The test software applies these calibration offsets to the raw output power measurements.
This adjustment ensures that the displayed RF power accurately reflects the module output.
Hardware Influence
Component selection for the routing matrix determines the baseline attenuation and thermal stability of the system. High-quality coaxial cables and solid-state RF switches minimize insertion loss and port-to-port crosstalk. Lowering the signal matrix loss increases the dynamic range of receiver sensitivity tests.
It allows the test jig to identify weak transmitters before they are packaged.
Wear Consequence
Mechanical degradation of RF connectors on the test line increases the path loss over thousands of cycles. Frequent calibration checks detect this variation and prompt maintenance of the fixture. This proactive monitoring avoids false failures on the production line.
