Checking The Validity Of A Time-Domain Calculation - Agilent Technologies N4413A User Manual

Performing Time Domain Measurements

Checking the Validity of a Time-Domain Calculation

Checking the Validity of a Time-Domain Calculation
There are a number of practical considerations in examining time domain data, as described
previously. Therefore, it is very important to have a method of validating the data. This can be
accomplished by comparing the original frequency domain data to the data after it is inverse
Fourier transformed into the time domain, and then Fourier transformed back into the
frequency domain, as shown in the following illustration. Ideally, these data should be
identical. Changing the time domain start- and stop-points, the filter value, and the value of
the DC parameter may improve the agreement.
See "3. Aliasing" on page 96 and its figure for an example.
98 Chapter 4