Configuration
R&S
®
FSW-K7
118
User Manual 1173.9240.02 ─ 23
●
Absolute low pass filters:
Absolute 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:
Filter type
Demodulation bandwidth
3 kHz:
6.4 kHz ≤ demodulation bandwidth ≤ 3 MHz
15 kHz:
50 kHz ≤ demodulation bandwidth ≤ 8 MHz
23 kHz
50 kHz ≤ demodulation bandwidth ≤ 18 MHz
150 kHz:
400 kHz ≤ demodulation bandwidth ≤ 8 MHz
Manual:
A low pass filter with the manually defined frequency is used.
Note:
If online demodulation output is active, the predefined (fixed) filters are not avail-
able. In this case, the frequency for the low pass filter must be defined manually (see
also
Chapter 5.8.2, "Analog Demodulation Output Settings"
If a filter was already configured when online demodulation output is activated, it is
replaced by a manual filter that provides corresponding results, if possible.
●
Relative low pass filters:
Relative filters (3 dB) can be selected in % of the demodulation bandwidth. The fil-
ters are designed as 5th-order Butterworth filter (30 dB/octave) and active for all
demodulation bandwidths.
●
"None" deactivates the AF low pass filter (default).
Remote command:
[SENSe:]FILTer<n>:LPASs[:STATe]
[SENSe:]FILTer<n>:LPASs:FREQuency[:ABSolute]
[SENSe:]FILTer<n>:LPASs:FREQuency:RELative
[SENSe:]FILTer<n>:LPASs:FREQuency:MANual
Weighting
Selects a weighting AF filter. By default, no weighting filter is active.
"A weighted"
Switches on the A weighted filter. The weighting filter is active in the
following demodulation bandwidth range:
100 kHz ≤ demodulation bandwidth ≤ 800 kHz
"CCITT"
Switches on a CCITT P.53 weighting filter. The weighting filter is
active in the following demodulation bandwidth range:
20 kHz ≤ demodulation bandwidth ≤ 3 MHz
"CCIR weigh-
ted"
Switches on the CCIR weighted filter. The weighting filter is active in
the following demodulation bandwidth range:
100 kHz ≤ demodulation bandwidth ≤ 3.0 MHz
"CCIR
unweighted"
Switches on the CCIR unweighted filter, which is the combination of
the 20 Hz highpass and 23 kHz low pass filter. The weighting filter is
active in the following demodulation bandwidth range:
50 kHz ≤ demodulation bandwidth ≤ 1.6 MHz
Demodulation
