Rohde & Schwarz FSW Series - Page 115

Configuration
R&S
®
FSW-K7
115User Manual 1173.9240.02 ─ 17
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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 5.9.2, "Analog Demodulation Output Settings", on page 124).
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.
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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.
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"None" deactivates the AF low pass filter (default).
Remote command:
[SENSe:]FILTer<n>:LPASs[:STATe] on page 265
[SENSe:]FILTer<n>:LPASs:FREQuency[:ABSolute] on page 264
[SENSe:]FILTer<n>:LPASs:FREQuency:RELative on page 264
[SENSe:]FILTer<n>:LPASs:FREQuency:MANual on page 264
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
Demodulation