Which spectrum analyzer function is useful for capturing and holding various impairments on its display?

The Max Hold function is particularly effective for capturing and displaying the maximum levels of signals over time, allowing users to observe the highest peaks of signals and any impairments that may occur. This function continuously updates the display with the highest value recorded, holding those peaks until a new higher peak is recorded. As a result, it's valuable for identifying intermittent or brief signals that may not be visible with other display functions.

While the Peak Hold function also captures peak signals, it resets after a defined time interval, making it less effective for maintaining a constant view of maximum signal levels over an extended period. The Average function smooths the display by calculating the average signal level over time, which can obscure transient impairments. The Zero Span function analyzes signals at a fixed frequency and is not suited for capturing varying signal levels over time. Thus, the Max Hold function is the optimal choice for observing and capturing signal impairments continuously.