R&S FSH Interference Analyzer (R&S FSH-K15/ -K16)
Measuring the Spectrum
Operating Manual 1173.6275.12 - 30 154
5.1 Measuring the Spectrum
Most spectrum measurements of the interference analyzer are also available in
Spectrum mode. Using these measurements allow you to locate interferences in the
frequency spectrum.
● "Measuring the Channel Power of Continuously Modulated Signals" on page 51
● "Measuring the Occupied Bandwidth" on page 55
● "Measuring the Adjacent Channel Leakage Ratio (ACLR)" on page 62
● "Working with the Spectrogram Result Display (R&S FSH-K14/ -K15)" on page 81
These measurements work the same and yield the same results as in Spectrum mode.
You can configure the measurements just as in Spectrum mode. For more information
see "Configuring Spectrum Measurements" on page 94.
In addition, the R&S FSH-K15 provides several dedicated measurements.
5.1.1 Measuring the Carrier-to-Noise Ratio
The Carrier-to-Noise (C/N) measurement is a tool to determine if a signal has sufficient
power compared to the spectrum surrounding it. In case of the carrier-to-noise
measurement, the R&S FSH determines the distance between the level of the carrier
and the lowest signal level that has been measured (usually the noise floor).
► Press the MEAS key.
► Press the "Meas Mode" softkey.
The R&S FSH opens the measurement menu.
► Select the "Carrier-to-Noise" menu item.
The R&S FSH starts to measure the carrier-to-noise ratio.
After you have started the measurement, the R&S FSH places two markers on the
trace. The first marker is placed on the peak power level. The R&S FSH assumes that
position as the level of the carrier. The second marker is positioned on the lowest level
that has been measured ("Min Peak").
Based on the markers, the R&S FSH then calculates the difference between the two
signal levels and returns the result as the "Carrier-to-Noise" ratio.
Optimizing the Settings
In order to get the best results, you can use the automatic adjustment routine that the
R&S FSH offers.
► Press the MEAS key.
► Press the "Adjust Settings" softkey.
The R&S FSH performs a sweep and repeats the peak search sequence for the
two markers.
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