Final answer:
The zero span and max hold features of a spectrum analyzer help in measuring frequency drift and phase noise, as well as peaks in amplitude modulation but are not used for directly measuring time delay.
Step-by-step explanation:
The zero span and max hold features of a spectrum analyzer are typically used to monitor and measure signal characteristics over time. The zero span feature allows the analyzer to fix on a single frequency and observe how the signal amplitude varies over time, which is essential when measuring frequency drift and phase noise. On the other hand, max hold functionality captures and holds the maximum amplitude of the signal, helping to assess peaks that might indicate amplitude modulation or transient phenomena. Neither feature is specifically designed for measuring time delay directly.