Measurement Examples RIGOL
User’s Guide for DSA1000 Series
3.11 Measuring the Carrier-to-Noise Ratio
DSA1030/DSA1030-TG that has installed the Advanced Measurement Kit option can
measure the carried-to-noise ratio. In the example below, we use a generator (such as
RIGOL DG3101A) to output a sine signal with 100 MHz and -10 dBm as the signal
under measure.
Procedures:
1. Device attachment
Connect the output terminal of the generator to the RF INPUT 50Ω terminal on
the front panel of the analyzer.
2. Measure the signal over the C/N Ratio function
(1) Reset the analyzer
－Press Preset
(2) Set the parameters
－Press FREQ
－Press Center Freq and enter 100 MHz.
－Press Meas
－Press Meas Fctn and enter the lower menu.
－Press C/N Ratio
(3) Modify the C/N Ratio settings
－Press Meas Setup
－Press Offset Freq and enter 2 MHz.
－Press Noise BW and enter 2 MHz.
－Press Carrier BW and enter 2 MHz.
3. Measurement result
The measurement results shown in the lower window are -9.55 dBm (carrier
power), -57.92 dBm (noise power) and 48. 37 dB (C/N Ratio), see figure below.
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