10-43
IM 701310-01E
Analysis and Search
3
2
1
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
App
Index
Explanation
FFT Points
Set the number of FFT points to 2.5k, 6.25k, 12.5k, 25k, 62.5k, 125k, or 250k.
Real-Part Waveform
Select the waveform from CH1 to CH4 or from M1 to M4.
Imaginary-Part Waveform
Select the waveform from CH1 to CH4, from M1 to M4, or X.
Source Window
Set the FFT analysis range to Main, Zoom1, or Zoom2.
Time Window
Select the time window for the FFT.
Rect (Rectangular), Hanning, or Flat top
Maximum-Hold Mode
Select whether to hold the maximum frequency up to that point from the start of
computation.
Reference Position
Set the vertical axis reference position. The selectable range is �4.00 divisions.
Vertical Axis
Auto
Automatically sets the axis.
Manual
Manually set the axis.
Horizontal Axis
Auto
Automatically sets the center and span.
Center/Span Manually set the axis center value and span.
Left/Right
Manually set the left and right edges.
Analysis Items
OFF
Disables the analysis function.
Marker
Set the F1 (X) marker and F2 (+) marker positions. The DL9000 measures the FFT values (frequency
and level) at the marker positions and the difference between the markers.
FFT frequency
F(F1) and F(F2)
FFT level
V(F1) and V(F2)
Difference between markers
Δ
F = F(F1) – F(F2)
Δ
V = V(F1) – V(F2)
F1 Position and F2 Position
Sets each marker position.
Selectable range
�5.00 divisions
Peak
Set two frequency ranges (horizontal axis). The DL9000 measures the peak FFT values (frequency
and level) in the two ranges and the difference between the peak values.
FFT frequency
Freq(Peak1) and Freq(Peak2)
FFT level
V(Peak1) and V(Peak2)
Difference between peak values
Δ
Freq = Freq(Peak1) – Freq(Peak2)
Δ
V = V(Peak1) – V(Peak2)
Peak1 and Peak 2
Set each analysis range.
Selectable range
�5.00 divisions
10.7 Performing FFT Analysis
