Tektronix TDS 420A - Page 92

Fast Fourier Transforms
TDS 420A, TDS 430A, TDS 460A & TDS 510A User Manual
3–41
Rectangular Window
0 dB
-20
-40
-50
Hanning Window
0 dB
-20
-40
-60
-80
Hamming Window
0 dB
-20
-40
-60
Blackman-Harris Window
0 dB
-20
-40
-60
-80
-100
-101
FFT Window Type Bandpass Filter
0.89
–3 dB
Bandwidth
Highest
Side Lobe
1.28
1.28
1.28
–13 dB
–32 dB
–43 dB
–94 dB
Figure 3–23: FFT Windows and Bandpass Characteristics