User Manual

Picture 2-19

FFT

window

Picture 2-20

Set dBVrms to

be the vertical

Scale unit

Sampling

rate

Time

ase

3. Select FFT window

Windows reduce spectral leakage in the FFT spectrum. The FFT assumes that

the YT waveform repeats forever. With an integral number of cycles, the YT

waveform starts and ends at the me amplitude and there are no discontinuities in the

signal shape A non-integral number of cycles in the YT waveform causes the signal

start and end points to be at different amplitudes. The transitions between the start

and end points cause discontinuities in the signal that introduce high-frequency

transients.