R&S FSQ Signal Analyzer - Rohde & Schwarz

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R&S FSQ Instrument Functions SELECT MARKER N DB DOWN 4.5.11.1 Activating the Markers PEAK SEARCH AUTO PEAK SEARCH PEAK LIST � NEW SEARCH PEAK LIST (ON OFF) AUTOSEARCH (ON OFF) SORT MODE (FREQ LEVEL) PEAK EXCURSION SEARCH LIMITS LEFT LIMIT | RIGHT LIMIT MKR SYMBOL (ON OFF) MKR NUMBER (ON OFF) MAX PEAK COUNT (50) PEAK LIST EXPORT DECIM SEP MARKER DEMOD � MKR DEMOD (ON OFF) MKR->TRACE AM | FM SQUELCH MKR STOP TIME CONT DEMOD Analyzer Mode The SELECT MARKER softkey activates the numerical selection of the marker in the data entry field. Delta marker 1 is selected by input of ' 0 '. If the marker is switched off, then it is switched on and can be moved later on. Remote command: CALC:MARK1 ON; CALC:MARK1:X ; CALC:MARK1:Y? PEAK The PEAK softkey sets the active marker/delta marker to the peak of the trace. Remote command: CALC:MARK1:MAX CALC:DELT1:MAX THRESHOLD SEARCH LIM OFF 4.62 Operating Manual 1313.9681.12 - 01
R&S FSQ Instrument Functions 4.5.11.2 Measurement of Noise Density Analyzer Mode NOISE MEAS The NOISE MEAS softkey switches the noise measurement for the active marker on or off. The corresponding marker becomes the NORMAL marker. During noise measurement, the noise power density is measured at the position of the marker. In the time domain mode, all points of the trace are used to determine the noise power density. When measurements are performed in the frequency domain, two points to the right and left of the marker are used for the measurement to obtain a stable result. The noise power density is indicated in the marker field. With a logarithmic amplitude units (dBm, dBmV, dBmµV, dBµA) the noise power density is output in dBm/Hz i.e. as level in 1 Hz bandwidth with reference to 1 mW. With linear amplitude units (V, A, Ω) the noise voltage density is evaluated in µV/√Hz, the noise current density in µA/√Hz or the noise power density in µW/Hz. The following settings have to be made to ensure that the power density measurement yields correct values: Detector: Sample or RMS Video bandwidth: ≤ 0.1 × resolution bandwidth with sample detector (corresponds to RBW / VBW NOISE) ≥ 3 × resolution bandwidth with RMS detector (corresponds to RBW / VBW SINE) In the default setting, the R&S FSQ uses the sample detector for the noise function. With the sample detector, the trace can additionally be set to AVERAGE to stabilize the measured values. With RMS detector used, trace averaging must not be used since in this case it produces too low noise levels which cannot be corrected. Instead, the sweep time can be increased to obtain stable measurement results. The R&S FSQ uses the following correction factors to evaluate the noise density from the marker level: • Since the noise power is indicated with reference to 1 Hz bandwidth, the bandwidth correction value is deducted from the marker level. It is 10 × lg (1 Hz/ BWNoise), where BWNoise is the noise or power bandwidth of the set resolution filter (RBW). • Sample detector As a result of video filter averaging and trace averaging, 1.05 dB is added to the marker level. This is the difference between the average value and the RMS value of white noise. With a logarithmic level axis, 1.45 dB is added additionally. Logarithmic averaging is thus fully taken into account which yields a value that is 1.45 dB lower than that of linear averaging. • RMS detector With the exception of bandwidth correction, no further corrections are required for the RMS detector since it already indicates the power with every point of the trace. To allow a more stable noise display the adjacent (symmetric to the measurement frequency) points of the trace are averaged. Operating Manual 1313.9681.12 - 01 4.63
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R&S ® FSQ Signal Analyzer Operatin
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