Spectrum Analyzer Mode
R&S
®
Cable Rider ZPH
225
User Manual 1321.0950.02 ─ 07
too low. For more information, see
Chapter 8.2.5.1, "Setting the Resolution Band-
width"
,
on page 221.
●
The sweep depends on the span. If you increase the span, you also have to
increase the sweep time.
In its default state, the R&S Cable Rider ZPH couples the sweep time to the span and
the resolution bandwidth to avoid invalid settings. If the coupling is active, the R&S
Cable Rider ZPH always sets the shortest possible sweep time to make sure that the
display of the spectrum is correct and valid.
The R&S Cable Rider ZPH requires a minimum sweep time of 20 ms for every 600
MHz of span. If you increase the span, the R&S Cable Rider ZPH will also increase the
sweep time.
In the time domain (span = 0), the R&S Cable Rider ZPH shows the video voltage over
time. The horizontal axis becomes a time axis that starts at 0 s and ends at the sweep
time that you selected. The range of the sweep time in the time domain is from 34 us to
1000 s.
1. Press the [SWEEP] key.
In the default state, "Auto SWT" is active.
2. Select the "Manual SWT" softkey.
The R&S Cable Rider ZPH opens an input field to set the sweep time.
3. Enter the sweep time you need.
If the video bandwidth is no longer coupled to the span or the resolution bandwidth,
the R&S Cable Rider ZPH puts a blue dot at the "SWT" displays on the "Parameter
View".
8.2.6.2
Selecting the Sweep Mode
The sweep mode is the way the R&S Cable Rider ZPH performs the measurement.
In its default state, the R&S Cable Rider ZPH measures continuously. In this mode, the
R&S Cable Rider ZPH automatically repeats the sweep in the defined range of the hor-
izontal axis (frequency or time) and updates the trace accordingly after it has finished
with one sweep.
In some cases, it may be sufficient to get the results over a single sweep only, e.g. if a
particular trigger condition is met. In single sweep mode, the R&S Cable Rider ZPH
performs the sweep a certain number of times (depending on the number of averages
you have set) over the defined range of the horizontal axis (frequency or time) and
then stops measuring. It performs another sweep only after you tell it to. For more
information on setting the number of sweeps included in a single sweep, see
Chap-
ter 8.2.7.1, "Selecting the Trace Mode"
,
on page 229.
1. Press the [SWEEP] key.
2. Select the "Single Sweep" softkey.
The R&S Cable Rider ZPH activates single sweep mode.
3. Select the "Cont Sweep" softkey.
Configuring Spectrum Measurements
