Spectrum Analyzer Mode
R&S
®
Spectrum Rider FPH
201
User Manual 1321.1011.02 ─ 11
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 Spectrum Rider 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 Spectrum Rider 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.
1. Press [MARKER] key
2. Select "Marker Function" key
3. Enable the "Noise" checkbox menu item.
The R&S Spectrum Rider shows the level at the marker frequency in dBm/Hz. If
you are using a delta marker for the measurement, the results have the unit
dBc/Hz with marker 1 being the reference.
Configuring Spectrum Measurements
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