User guide

The fundamental frequency and its harmonics appear.
Such spectra have been measured with the Spectral Jitter measurement.
A logarithmic power scale shows the details:
When the repetition period of the characteristic pattern in the error record
increases, you will also find the typical sine-x-over-x decay of the spectral power.
FFT assumes that the time record contains a representative section of an endless
periodic signal. It assumes that time records can be seamlessly concatenated. If
this is not the case, a phenomenon called leakage occurs.
Advanced Analysis 6
Agilent J-BERT N4903B High-Performance Serial BERT 349
Leakage and Windowing