What technique is used for measuring signal levels in coaxial cables?

The technique that is most relevant for measuring signal levels in coaxial cables is return path sweep. This method involves sweeping a frequency range to assess the quality of the return path signals in a coaxial cable system. It allows technicians to identify issues such as signal loss or degradation at different frequencies, which is crucial for ensuring that the coaxial cable is transmitting signals effectively.

In contrast, while spectrum analysis is useful for examining the frequency characteristics of signals, it is not specific to coaxial cable measurements. Signal attenuation measurement is important but typically refers to measuring the loss of signal strength over a length of cable rather than assessing signal levels directly. Point-to-point testing is more of a general method for checking connectivity and signal presence rather than providing detailed insights into the signal levels specifically in coaxial cables. Thus, return path sweep stands out as the appropriate technique for measuring signal levels in this context.