R&S FSQ Signal Analyzer - Rohde & Schwarz

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R&S FSQ Getting Started Measurements on Modulated Signals Fig. 2.20 Filter edge of a 300 kHz filter used as an FM-discriminator characteristic 5. Set an FM deviation of 100 kHz and an AF of 1 kHz on the signal generator 6. Set a frequency deviation of 0 Hz on the R&S FSQ ➢ Press the SPAN key. ➢ Press the ZERO SPAN. The demodulated FM signal is displayed. The signal moves across the screen. 7. Creating a stable display by video triggering ➢ Press the TRIG key. ➢ Press the VIDEO softkey. A stationary display is obtained for the FM AF signal Result: (-10 ±5) dB; this means that a deviation of 100 kHz is obtained if the demodulator characteristic slope is 5 dB/100 kHz 2.32 Operating Manual 1313.9681.12 - 01
R&S FSQ Getting Started Fig. 2.21 Demodulated FM signal Measurements on Modulated Signals 2.5.3 Measuring Channel Power and Adjacent Channel Power Measuring channel power and adjacent channel power is one of the most important tasks in the field of digital transmission for a Signal Analyzer with the necessary test routines. While, theoretically, channel power could be measured at highest accuracy with a power meter, its low selectivity means that it is not suitable for measuring adjacent channel power as an absolute value or relative to the transmit channel power. The power in the adjacent channels can only be measured with a selective power meter. A Signal Analyzer cannot be classified as a true power meter, because it displays the IF envelope voltage. However, it is calibrated such as to correctly display the power of a pure sinewave signal irrespective of the selected detector. This calibration is not valid for non-sinusoidal signals. Assuming that the digitally modulated signal has a Gaussian amplitude distribution, the signal power within the selected resolution bandwidth can be obtained using correction factors. These correction factors are normally used by the R&S FSQ's internal power measurement routines in order to determine the signal power from IF envelope measurements. These factors are valid if and only if the assumption of a Gaussian amplitude distribution is correct. Apart from this common method, the R&S FSQ also has a true power detector, i.e. an RMS detector. It correctly displays the power of the test signal within the selected resolution bandwidth irrespective of the amplitude distribution, without additional correction factors being required. With an absolute measurement uncertainty of < 0.3 dB and a relative measurement uncertainty of < 0.1 dB (each with a confidence level of 95%), the R&S FSQ comes close to being a true power meter. Operating Manual 1313.9681.12 - 01 2.33
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