R&S FSV-K7 Operating Manual page 52

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R&S FSV-K7/K7S
Demod BW
Opens an edit dialog box to enter the demodulation bandwidth of the analog demodu-
lation. The demodulation bandwidth determines the sampling rate for recording the sig-
nal to be analyzed. For details on the relation between demodulation bandwidth and
sampling rate refer to
Offset",
Remote command:
[SENSe:]BANDwidth|BWIDth:DEMod
Meas Time
Opens an editor for entering the measurement time of the analog demodulation. For
details on the measurement time values refer to
surement Time and Trigger
Note: For FM Stereo measurements (option K7S), the minimum measurement time is
2 ms.
Remote command:
[SENSe:]ADEMod:MTIMe
AF Filter
The bandwidth of the demodulated signal can be reduced by high pass or low pass fil-
ters and also a de-emphasis can be switched on. The selected filters are used for AM,
FM and PM demodulation in common. Individual settings are not possible.
High Pass ← AF Filter
Opens the "High Pass" selection list to switch on a high pass filter with the given limit
to separate the DC component. The filters are indicated by the 3 dB cutoff frequency.
The 50 Hz and 300 Hz filters are designed as 2nd-order Butterworth filter (12 dB/
octave). The 20 Hz filter is designed as 3rd-order Butterworth filter (18 dB/octave).
"None" deactivates the AF high pass filter. Default is "None".
The high pass filters are active in the following demodulation bandwidth range:
20 Hz
50 Hz:
300 Hz:
Note: for FM stereo (K7S), all filters are active at all times, as the demodulation range is always 400 kHz
Remote command:
[SENSe:]FILTer<n>:HPASs[:STATe]
[SENSe:]FILTer<n>:HPASs:FREQuency
Low Pass ← AF Filter
Opens the "Low Pass" selection list to select the filter type. Relative and absolute low
pass filter are available.
●
Absolute low pass filters:
The 3 kHz, 15 kHz; 23 kHz and 150 kHz softkeys switch on a absolute low pass
filter. The filters are indicated by the 3 dB cutoff frequency. The 3 kHz, 15 kHz and
Operating Manual 1176.7561.02 ─ 06
Chapter 2.1.3, "Sample Rate, Measurement Time and Trigger
on page 13.
Offset",
on page 133
100 Hz ≤ demodulation bandwidth ≤ 1.6 MHz
200 Hz ≤ demodulation bandwidth ≤ 3 MHz
800 Hz ≤ demodulation bandwidth ≤ 8 MHz
Analog Demodulation Option R&S FSV–K7
Softkeys of the Analog Demodulation option
on page 147
Chapter 2.1.3, "Sample Rate, Mea-
on page 13.
on page 151
on page 152
52