R&S ZVL
GUI Reference
Channel Menu
Operating Manual 1303.6580.32-06
218
Fine Adjust...
opens a dialog to modify the selected measurement bandwidth and the selectivity of the IF
filter.
•
The input field shows the last IF filter bandwidth selected. The arrow buttons increment and
decrement the bandwidth in 1-2-5 steps for each decade. Entered values between the steps will
be rounded up, values exceeding the maximum bandwidth rounded down.
•
Filter Type
selects between two types of IF filters:
Fast
filters with short settling time and
Normal
filters with longer settling time but higher selectivity.
The selected bandwidth and selectivity applies to all filters used in the current channel. This makes sense
because the measurement speed is limited by the slowest filter in the channel. In
Segmented Frequency
sweeps, the bandwidth and selectivity can be set independently for each segment; see
Define Segments
.
Optimizing the filter settings
A high selectivity
(Filter Type: Normal)
and a small filter bandwidth both suppress the noise level around
the measurement frequency and thus increase the dynamic range. On the other hand the time needed to
acquire a single measurement point increases for small filter bandwidths and high selectivity. For small
bandwidths, the filter settling time, which is inversely proportional to the bandwidth, is responsible for the
predominant part of the measurement time.
In general, the system error correction is no longer valid after a change of the IF filter bandwidth. The
message Cal? appears in the trace list.
Remote control:
[SENSe<Ch>:]BANDwidth|BWIDth[:RESolution]
[SENSe<Ch>:]BANDwidth[:RESolution]SELect
Cal
The
Cal
submenu provides all functions that are necessary to perform a system error correction
(calibration).
For an introduction to calibration and calibration types refer to section Calibration Overview in the
System Overview
chapter. See also the
Data Flow
overview in the
System Overview
chapter.
