R&S ZNB Series User Manual page 349

®
R&S ZNB/ZNBT
"Low Pass Settings..." opens the
Time Domain
Selects the time domain representation for the active diagram area. The softkey is
enabled if a linear frequency sweep is active (see
lyzer automatically quits time domain representation when a different sweep type is
selected.
The time domain results are obtained by transforming the measured frequency sweep
data into the time domain using an appropriate mathematical transformation type and
frequency window ("Impulse Response"). The sweep range and the output power for
the active channel is still displayed below the diagram; the displayed time interval is
shown in a second line:
Trace settings in time domain representation
While the time domain representation is active, the trace settings behave as follows:
●
The "Start" and "Stop" settings in the "Time Gate" tab configure the time axis.
●
All trace formats including the circular diagrams are available.
●
Limit lines can be defined like the limit lines for time sweeps.
●
The bandfilter search functions are available for the transformed trace.
●
If marker coupling is active, then the markers in the time domain and in the fre-
quency domain are coupled with each other.
The analyzer places no restriction on the measured quantities to be transformed into
the time domain. Impedances and admittances are first converted back into the equiva-
lent S-parameter, transformed, and restored after the transformation.
See also
Remote command:
CALCulate<Chn>:TRANsform:TIME:STATe
Type
Selects a band pass or low pass time domain transform. See
pass and low pass
To calculate a low pass transform, the sweep points must be on a harmonic grid. Oth-
erwise the analyzer can only calculate an approximate result and generates a warning.
"Low Pass Settings..." opens a dialog that allows to establish or change a harmonic
grid (not available for memory traces). See
log",
Remote command:
CALCulate<Chn>:TRANsform:TIME[:TYPE]
CALCulate<Chn>:TRANsform:TIME:STIMulus
Impulse Response
Selects a window type which the R&S ZNB/ZNBT uses to filter the trace in the fre-
quency domain. The drop-down list shows the impulse response of a constant trace
over a finite sweep range (i.e. a rectangular function) that was filtered using the differ-
ent available window types. The selected window is applied to the active trace.
See also
User Manual 1173.9163.02 ─ 62
Chapter 4.7.2.1, "Chirp
mode", on page 223.
on page 351.
Chapter 4.7.2.3, "Windows in the frequency
Low Pass Settings dialog.
"Lin Freq"
z-transformation", on page 223.
Chapter 5.5.5.2, "Low Pass Settings dia-
domain",
GUI reference
Trace Config softtool
on page 426). The ana-
Chapter 4.7.2.2, "Band
on page 225.
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