Spectrum Analyzer Mode
R&S
®
Cable Rider ZPH
240
User Manual 1321.0950.02 ─ 07
Deactivating marker search limits
1. Press the "Selected Marker" softkey.
2. Select the "Search Range Off" menu item.
3. Confirm the selection by pressing the rotary knob.
The R&S Cable Rider ZPH turns off the marker search limit function for the
selected marker.
4. To turn off the marker search limits function for all markers, select "All Markers"
softkey and repeat the above steps
8.2.8.8
Using Marker Functions
In addition to the frequency and level readout, the R&S Cable Rider ZPH provides sev-
eral, more complex, marker functions in spectrum analyzer mode.
Marker function frequency
Marker functions are only applied to the marker position at center frequency.
Deactivating marker functions
Selecting a marker function again while it is still active will turns that marker function
off.
Measuring the Noise Power Density
The marker noise function calculates the noise power density at the marker position in
dBm/Hz. The R&S Cable Rider ZPH includes several variables in the calculation of the
noise power density, including the trace pixel values, the resolution bandwidth, the
detector and the level display mode (absolute or relative). To stabilize the noise power
display, the R&S Cable Rider ZPH uses the pixel the marker is on and four pixels to
the right and four pixels to the left of the marker pixel.
Noise power density can provide useful information when you are measuring noise or
digitally modulated signals. However, you get valid results only if the spectrum in the
vicinity of the marker has a flat frequency response. When measuring the noise power
density on discrete signals, results are not valid.
Configuring Spectrum Measurements
