Sensitivity refers to the analyzer's ability to detect minimal signal levels, while dynamic range is the range over which the analyzer can provide meaningful measurements without distortion. Additionally, the spurious-free dynamic range (SFDR) indicates the analyzer's ability to measure small signals in the presence of large ones, without creating its own spurious responses. This is particularly important in applications where you need to distinguish between actual low-level signals and those generated by the analyzer's own imperfections. Ensuring your spectrum analyzer excels in these areas guarantees more reliable and accurate readings in complex signal environments.