The time domain capability, Option 010, allow you to measure the time domain response of a device. The analyzer can transform frequency domain data to the time domain or time domain data to the frequency domain.
The transform used by the analyzer resembles time domain reflectometry (TDR) measurements. TDR measurements, however, are made by launching an impulse or step into the test device and observing the response in time with a receiver similar to an oscilloscope. In contrast, the analyzer makes swept frequency response measurements, and mathematically transforms the data into a time domain reflectometer-like display.