R&S FSV-K7, Operating Manual, Page: 31 / 262

Analog Demodulation Option R&S FSV–K7
R&S
®
FSV-K7/K7S
31 Operating Manual 1176.7561.02 ─ 06
Meas Time ← AM
Opens an editor for entering the measurement time of the analog demodulation. For
details on the measurement time values refer to
Chapter 2.1.3, "Sample Rate, Mea-
surement Time and Trigger Offset" , on page 13.
Note: For FM Stereo measurements (option K7S), the minimum measurement time is
2 ms.
Remote command:
[SENSe:]ADEMod:MTIMe
on page 133
AF Filter ← AM
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 ← AM
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 100 Hz ≤ demodulation bandwidth ≤ 1.6 MHz
50 Hz: 200 Hz ≤ demodulation bandwidth ≤ 3 MHz
300 Hz: 800 Hz ≤ demodulation bandwidth ≤ 8 MHz
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]
on page 151
[SENSe:]FILTer<n>:HPASs:FREQuency
on page 152
Low Pass ← AF Filter ← AM
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
23 kHz filters are designed as 5th-order Butterworth filters (30 dB/octave). The 150
kHz filter is designed as 8th-order Butterworth filter (48 dB/octave).
The absolute low pass filters are active in the following demodulation bandwidth
range:
3 kHz: 6.4 kHz ≤ demodulation bandwidth ≤ 3 MHz
15 kHz: 50 kHz ≤ demodulation bandwidth ≤ 8 MHz
Note: for FM stereo (K7S), all filters are active at all times, as the demodulation range is always 400 kHz
Softkeys of the Analog Demodulation option