Spectrum Analyzer Mode
R&S
®
Cable Rider ZPH
171
User Manual 1321.0950.02 ─ 07
8.1.2.4
Changing the Span
Usually, the span the R&S Cable Rider ZPH sets yields optimal results. But sometimes
you also need to see the spectrum outside the current span to detect other signal com-
ponents that you need to include in the measurement. Therefore, you can adjust the
span to up to 10 times the channel bandwidth and hence still be able to see the spec-
trum outside the measurement channel.
1. Press the [CAL/SPAN] key.
2. Select the "Manual Span" softkey.
The R&S Cable Rider ZPH opens an input field to define the span manually.
3. Enter the span you need.
The largest possible span for the channel power measurement is ten times the
channel bandwidth. At larger spans, the result of the channel power measurement
would be increasingly imprecise, because too few points of the trace would be in
the channel you are measuring.
8.1.2.5
Measuring the Maximum Channel Power
If signal levels fluctuate significantly, you can define the maximum channel power with
the "Max Hold" function.
1. Press the [MEAS] key.
2. Select the "Power Display" softkey.
The R&S Cable Rider ZPH opens a submenu to select channel power measure-
ment mode.
3. Select the "Max Hold" menu item.
The power display (see item 2 of
Figure 8-1
) switches from [Power] to "Max
Power".
If you want to deactivate the "Max Hold" function and return to the normal power
display, activate "Clear/Write".
4. To deactivate the "Max Hold" function, press the "Power Display" softkey.
5. Select the "Clear/Write" menu item.
The power display returns to "Power" display.
8.1.2.6
Unit for Power Display
The R&S Cable Rider ZPH can apply different units to the power output. The default
unit is dBm.
1. Press the [MEAS] key.
2. Select the "Power Unit" softkey.
The R&S Cable Rider ZPH opens a submenu to select the power unit.
Performing Spectrum Measurements
