Operating instructions

SENSe:BANDwidth Subsystem R&S ESCI
1166.6004.12 6.156 E-1
[SENSe<1|2>:]BANDwidth|BWIDth:VIDeo:TYPE LINear | LOGarithmic
This command selects the position of the video filter in the signal path, provided that the resolution
bandwidth is ≤100 kHz:
- If LINear is selected, the video filter is connected ahead of the logarithmic amplifier (default)
- If LOGarithmic is selected, the video filter follows the logarithmic amplifier
The essential difference between the two modes is the transient response at falling signal edges:
If LINear is selected, the measurement with logarithmic level scaling yields a much "flatter" falling
edge than LOGarithmic.
This behaviour is due to the conversion of linear power into logarithmic level. If the linear power is
halved, the level decreases by only 3 dB.
Example: "BAND:VID:TYPE LIN" 'Video filter ahead of the logarithmic amplifier
Characteristics: *RST value: LIN
SCPI: device-specific
Mode: A
[SENSe<1|2>:]BANDwidth|BWIDth:DEMod <numeric-value>
This command defines the demodulation bandwidth of the instrument for analog demodulation. The
required sampling rate is automatically set depending on the selected demodulation bandwidth.
The available demodulation bandwidths are determined by the existing sampling rates.
rounded
demodulation
bandwidth
Sampling rate
10 MHz 32 MHz
8 MHz 16 MHz
5 MHz 8 MHz
3 MHz 4 MHz
1.6 MHz 2 MHz
800 kHz 1 MHz
400 kHz 500 kHz
200 kHz 250 kHz
100 kHz 125 kHz
50 kHz 62.5 kHz
25 kHz 31.25 kHz
12.5 kHz 15.625 kHz
Example: "ADEM:BAND:DEM 1MHz" 'Sets demodulation bandwidth to 1 MHz.
Characteristics: *RST value: 5 MHz
SCPI: device specific
Mode:FM
This command is only available with option R&S FS-K7 (FM Demodulator).