R&S
®
ZVA/ZVB/ZVT Trace Menu
1145.1084.12 4.67 E-6
frequencies, so that the missing values (green and red dots) are obtained without any additional
i
nput. The extrapolation is repeated after each sweep.
Remote
control:
CALCulate<Ch/Tr>:TRANsform:TIME:LPASs KFSTop | KDFRequency |
KSDFrequency
CALCulate<Ch/Tr>:TRANsform:TIME:LPASs:DCSParam
CALCulate<Ch/Tr>:TRANsform:TIME:LPASs:DCSParam:CONTinuous
CALCulate<Ch/Tr>:TRANsform:TIME:LPASs:DCSParam:EXTRapolate
CALCulate<Ch/Tr>:TRANsform:TIME:LPFRequency
Set Harmonic Grid
In the Set Harmonic Grid... panel of the Low Pass Settings dialog, a harmonic grid can be calculated in
three alternative ways:
• Keep Stop Frequency and Number of Points calculates a harmonic grid based on the current
stop frequency (Channel – Stimulus – Stop) and the current number of sweep points (Channel
– Sweep – Number of Points). This may increase the step width, narrowing the unambiguous
range but improving the time domain resolution.
• Keep Frequency Gap and Number of Points calculates a harmonic grid based on the current
stop frequency (Channel – Stimulus – Stop) and the current frequency gap (the spacing
between the equidistant sweep points, i.e. the sweep Span divided by the Number of Points
minus one) . This leaves the unambiguous range unchanged but may lower the stop frequency
and therefore deteriorate the time domain resolution.
• Keep Stop Frequency and Approximate Frequency Gap calculates a harmonic grid based on
the current stop frequency (Channel – Stimulus – Stop), increasing the number of points
(Channel – Sweep – Number of Points) in such a way that the frequency gap remains
approximately the same. This leaves both the time domain resolution and the unambiguous
range unchanged but may increase the sweep time, due to the additional sweep points
introduced.
The three grids can be calculated repeatedly in any order; the analyzer always starts from the original
set of sweep points.
•
Visualization of the harmonic grid algorithms
The three types of harmonic grids have the following characteristics:
• Keep Stop Frequency and Number of Points means that the stop frequency and the number of
sweep points is maintained. The sweep points are re-distributed across the range between the
minimum frequency of the analyzer and the stop frequency; the step width may be increased.
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