Rohde & Schwarz R&S FSP Series, Руководство по эксплуатации

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Operating Manual 1164.4556.12 - 06 6.145
R&S FSP Remote Control – Description of Commands
SENSe Subsystem
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 resolution bandwidth.
Analog resolution filters from 10 Hz to 10 MHz in 1, 3, 10 steps are available. These filters are
implemented as 4-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).
These bandwidths can only be obtained by entering numeric values and not with the commands
INCrement
and
DECrement
.
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.
A number of especially steep-edged channel filters can be selected from firmware version 1.10 or
higher 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
“Instrument Functions” , section “Setting the Bandwidths and Sweep Time –
BW Key” on page 4.18 .
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 1MHz"
'Sets the resolution bandwidth to 1 MHz
Characteristics: *RST value: - (AUTO is set to ON)
SCPI: conform
Mode: A