R&S ZVL GUI Reference
Trace Menu
Operating Manual 1303.6580.32-06
141
In frequency domain representation the diagram shows the measured trace as a function of the stimulus
f
r
equency applied to the DUT. The trace corresponds to the results obtained during the frequency sweep,
however, the effect of a time gate is taken into account as long as the Time Gate function is active. The x-
axis corresponds to the sweep range (stimulus range) selected via Channel – Center / Span.
In time domain representation, you can use the Time Gate settings in order to eliminate unwanted
responses in your signal. After switching back to the frequency domain, you will receive the frequency
response of your DUT without the contribution of the unwanted responses.
Gated and ungated state of the frequency domain representation
The trace in the frequency domain depends on the state of the Time Gate:
• If the gate is disabled, the frequency domain (FD) trace corresponds to the sweep results prior to
the transformation.
• If the gate is enabled, the frequency domain trace shown is calculated from the time domain (TD)
trace which is gated and transformed back into the frequency domain.
• The analyzer uses modified window and time gate settings to calculate the gated FD trace:
• All windows are rectangular, however, the width and position of the time gate affect the gated
frequency domain trace. The window type selections in the Define Transform and Define Time
Gate dialogs are ignored. The selected windows are used again when the TD trace is displayed
(Time Domain: On).
• The rectangular No Profiling (Rectangle) windows minimize numerical inaccuracies near the
boundaries of the measured frequency span. In the limit where the effect of the time gate
vanishes (e.g. a gate of type Notch and a very small width), the time gated trace is equal to the
original measured trace.
Remote control:
CALCulate<Chn>:TRANsform:TIME:STATe OFF
Time Domain
Selects the time domain representation for the active diagram area. The softkey is enabled if option ZVL-
K3, Time Domain, is available, and if a linear frequency sweep (Channel – Sweep – Sweep Type – Lin.
Frequency) is active. The analyzer automatically quits time domain representation as soon as a different
sweep type is selected.
In time domain representation the diagram shows the measurement results as a function of time. The
results are obtained by transforming the measured frequency sweep data into the time domain using an
appropriate mathematical transformation type and frequency window (Define Transform...). 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:
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