What the label leaves out
It includes dissipative loss and may also include mismatch effects depending on the definition and setup. Frequency, ports, calibration plane, and load matter.
The mistake to avoid
Subtracting two casual power-meter readings can mislabel mismatch as device heating, while a low SWR can coexist with significant internal loss.
A sound installation approach
Calibrate at the intended reference planes, use matched fixtures and loads, measure S-parameters or power consistently across frequency, and separate return loss from dissipative loss when possible.
Use current manufacturer documentation, measured RF behavior, the building grounding system, and applicable electrical and lightning requirements. A ratio, DC continuity check, or inline protective device does not establish complete-system safety or efficiency.
