R&S ESU Series Operating Manual page 594

R&S ESU
6.16.2 SENSe:BANDwidth Subsystem
This subsystem controls the setting of the instrument's filter bandwidths. Both groups of commands
(BANDwidth and BWIDth) perform the same functions.
The measurement windows are selected by SENSe1 (screen A) and SENSe2 (screen B).
[SENSe<1|2>:]BANDwidth|BWIDth:FFT WIDE | AUTO | NARROW
This command allows to specify between the following three options for FFT filters.
WIDE: The FFT filters with the greater partial span (this is the span which is covered with one FFT
analysis) are used always.
AUTO: The firmware decides whether to use wide or narrow filters to achieve the best performance of
the measurement.
NARROW: The FFT filters with the smaller partial span are used, this allows measurements near a
carrier with reduced reference level, because of a more narrow analog prefilter.
Example:
"BWID:FFT WIDE"
Characteristics: *RST value: AUTO
SCPI: device-specific
Mode: A
[SENSe<1|2>:]BANDwidth|BWIDth[:RESolution] 10 Hz to 10 MHz
This command defines the IF bandwidth or, in analyzer mode, the resolution bandwidth.
Analog resolution filters of 10 Hz to 10 MHz in 1, 2, 3, 5, 10 steps are available. These filters are
implemented as 5-circuit LC filters in the range from 300 kHz to 10 MHz and as digital filters with analog
characteristic in the range of 10 Hz to 100 kHz.
In addition, the EMI bandwidths 200 Hz, 9 kHz, and 120 kHz are available (6 dB bandwidths each).
The 1 MHz EMI bandwidth is the impulse bandwidth.
The EMI bandwidths are only available when parameter PULSe is selected by command BAND:TYPE.
FFT filters from 1 Hz to 30 kHz (3 dB bandwidth each) are also available in the frequency domain (span
> 0) for fast measurements on periodic signals. The instrument automatically switches to analog filters
above 30 kHz.
The FFT bandwidths are not available if the preselector is switched on.
A number of especially steep-edged channel filters can be selected provided that parameters
CFILter or RRC are selected using the BAND:TYPE command. The possible combinations of filter
type and filter bandwidth are listed in the table "List of available channel filters" of chapter
Functions", section "Setting the Bandwidths and Sweep Time – BW Key" on page
If the resolution bandwidth is modified in analyzer mode, the coupling to the span is automatically
switched off.
If the resolution bandwidth is modified in FM demodulator mode, the coupling to the demodulation
bandwidth is automatically switched off.
Example:
"BAND 120 kHz"
'Sets the IF bandwidth to 120 kHz
Characteristics: *RST value: - (AUTO is set to ON)
SCPI: conform
Mode: R, A
Operating Manual 1302.6163.12 - 03
Remote Control – Description of Commands
SENSe Subsystem
"Instrument
4.111.
6.155