Oscilloscope Reference Spectral math phase controls
width must be greater than or equal to the period of the start frequency of the span of the spectral analyzer.
That is, there must be at least one cycle of the harmonic being measured within the gated region.
There are eight different spectral analyzer windows:
Rectangular (see page 778)
Gaussian (see page 775)
Hamming (see page 776)
Blackman-H
arris
(see page 776)
Hanning (see page 776)
Flattop2 (see page 774)
Kaiser-Bessel (see page 776)
Tek Exponential (see page 779)
Your choice of window function will depend on the input source characteristics that you want to observe
and the characteristics of the window function. The window characteristics a re shown in the following
table.
Wind
ow
3dBB
Winbins
Scallop loss
Near
est side
lobe
Zero
phase
reference
Coefficients
Rect
angular
0.89 3.96
dB
-13 d
B
50%
1.0
Ham
ming
1.3 1.7
8dB
-43
dB
50%
0.5
43478,
0.456522
Han
ning
1.4
4
1.4
2dB
-32
dB
50%
0.5
,0.5
Ka
iser-Bessel
1.
72
1.
02 dB
-6
9dB
50%
0.
40243,
0.49804,
0.09831,
0.
00122
Blackman-
H
arris
1.92 0.81 dB -92 dB
5
0%
0.35875,
0
.48829,
0.14128,
0.01168
Gaussian
2.0 0 .76 dB -79 dB
50% a = 3.75 (not
cosine series)
Flattop2 3.8 0.0065 dB -90 dB
50%
0.213348,
-0.206985,
0.139512,
-0.043084,
0.003745
Tek Exponential 1.42 0.60 dB -67 dB
20%
not applicable
xxx
3dBBWinbins
This is the bandwidth in units of bins, which are the intervals between spectral output samples when no
zero fill is used. The bandwidth is measured between the points on the lobe that are 3 dB down from the
DSA/DPO70000D, MSO/DPO/DSA70000C, DPO7000C, and MSO/DPO5000 Series 769
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