R&S ZVL GUI Reference
Trace Menu
Operating Manual 1303.6580.32-06
150
• S
tart and
Stop or Center and Span define the size of the time gate. The analyzer generates a
warning if the selected time span exceeds the unambiguous range which is given by Qt = 1/f,
where Qf is the spacing between two consecutive frequency points. Simply reduce the time span
until the warning disappears.
• The filter Type defines what occurs to the data in the specific time region. A Band Pass filter
passes all information in the specified time region and rejects everything else. A Notch filter
rejects all information in the specified time region and passes everything else.
• If the Show Gate Limits after Closing this Dialog check box is selected two red lines indicating the
start and stop of the time gate are permanently displayed in the diagram area.
• The Gate Shape panel visualizes how the time gate will affect a constant function after
transformation back into the frequency domain. The selected window is applied to the active trace.
The two red vertical lines represent the Start and Stop values defining the size of the time gate.
The analyzer always uses a Steepest Edges (Rectangle) window to calculate the time-gated
frequency domain trace, see background information is section Frequency Domain.
• If an Arbitrary Gate Shape (Dolph-Chebychev) window is selected, the Arbitrary Sidelobe Level
can be set below the Gate Shape diagrams.
Use the paste marker list for convenient entry of Start and Stop values.
•
Comparison of time gates
The properties of the time gates are analogous to the properties of the frequency domain windows. The
following table gives an overview:
Window Sidelobe suppression Passband
ripple
Best for...
Steepest Edges
(Rectangle)
13 dB 0.547 dB
Eliminate small distortions in the vicinity of the useful
signal, if demands on amplitude accuracy are low
Steep Edges
(Hamming)
43 dB 0.019 dB
Good compromise between edge steepness and
sidelobe suppression
Normal Gate (Hann) 32 dB 0.032 dB
Good compromise between edge steepness and
sidelobe suppression
Maximum Flatness
(Bohman)
46 dB 0 dB
Maximum attenuation of responses outside the gate
span
Arbitrary Gate Shape
(Dolph-Chebychev)
User defined between 10
dB and 120 dB
0.071 dB
Adjustment to individual needs; tradeoff between
sidelobe suppression and edge steepness
Remote control:
CALCulate<Chn>:FILTer[:GATE]:TIME:STARt
CALCulate<Chn>:FILTer[:GATE]:TIME:STOP
CALCulate<Chn>:FILTer[:GATE]:TIME:CENTer
CALCulate<Chn>:FILTer[:GATE]:TIME:SPAN
CALCulate<Chn>:FILTer[:GATE]:TIME[:TYPE] BPASs | NOTCh
CALCulate<Chn>:FILTer[:GATE]:TIME:SHOW
CALCulate<Chn>:FILTer[:GATE]:TIME:WINDow RECT | HAMMing | HANN
| BOHMan | DCHebyshev
CALCulate<Chn>:FILTer[:GATE]:TIME:DCHebyshev
Import/Export Data
Stores one or several data or memory traces to a file or loads a memory trace from a file. Import or export
is selected from a submenu:
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