Rohde & Schwarz 1145.1010.04/05/06, Operating Manual

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R&S
®
ZVA/ZVB/ZVT Trace Menu
1145.1084.12 4.61 E-6
factor of 2. This increased computation time is usually negligible compared to the sweep times of the
analyzer.
The following properties of the Chirp z-transformation are relevant for the analyzer settings:
•
The frequency points must be equidistant. If a Log Frequency or Segmented Frequency sweep
is active, the measurement points are interpolated.
•
The time domain response is repeated after a time interval which is equal to t = 1/ f, where f
is the spacing between two consecutive sweep points in the frequency domain. For a sweep
span of 4 GHz and 201 equidistant sweep points, f = 4 GHz/200 = 2 * 10
7
Hz, so that t = 50
ns. t is termed measurement range (in time domain) or unambiguous range.
Additional constraints apply if the selected Chirp z-transformation is a lowpass transformation.
Remote control: CALCulate<Ch/Tr>:TRANsform:TIME:STATe ON
Time Domain Stimulus Axis
Opens a submenu to define the stimulus axis range for time domain representation.
•
Start Time Domain is the lowest displayed time and corresponds to the left edge of the
Cartesian diagram.
•
Stop Time Domain is the highest displayed time and corresponds to the right edge of the
Cartesian diagram.
•
Center Time Domain corresponds to the center of the Cartesian diagram, i.e. (Start + Stop)/2.
•
Span Time Domain corresponds to the diagram width, i.e. (Stop – Start).
•
Time and Distance switch over between the x-axis scaling in time units or distance units.
•
Set Frequencies opens the Channel – Stimulus menu in order to change the stimulus axis in