R&S ESU Series - Page 143

R&S ESU Instrument Functions
Analyzer Mode
4.112 Operating Manual 1302.6163.12 - 03
BW
The BW key opens a menu for setting the resolution bandwidth, the video bandwidth,
the sweep time and their couplings.
The …BW AUTO softkeys are used to couple the functions. The coupling ratios are
selected by means of the COUPLING RATIO softkey.
The …BW MANUAL softkeys allow a parameter to be entered. This parameter is not
coupled to the other parameters.
RES BW
MANUAL
The RES BW MANUAL softkey activates the manual data entry for the resolution
bandwidth.
The resolution bandwidth can be selected in 1/2/3/5/10 steps in the range between
10 Hz and 10 MHz. The nominal resolution bandwidth is the 3 dB bandwidth.
When FFT filters are used, the lower limit of the bandwidth is 1 Hz. FFT filters may
be used with bandwidths up to 30 kHz.
For numeric inputs, the values are always rounded to the nearest possible band-
width. For rotary knob or UP/DOWN key inputs, the bandwidth is adjusted in steps
either upwards or downwards.
RES BW MANUAL
VIDEO BW MANUAL
SWEEPTIME MANUAL
RES BW AUTO
VIDEO BW AUTO
SWEEPTIME AUTO
COUPLING RATIO
! RBW / VBW SINE [1/3]
RBW / VBW
PULSE [0.1]
RBW / VBW NOISE [10]
RBW / VBW MANUAL
SPAN / RBW AUTO [50]
SPAN / RBW MANUAL
DEFAULT COUPLING
FILTER TYPE
Side menu
MAIN PLL BANDWIDTH
FFT FILTER MODE
VBW MODE LIN | LOG
With the …BW AUTO softkeys the resolution bandwidth, the video bandwidth and
the sweep time can be entered separately for the frequency domain (span > 0 Hz)
and the time domain (span = 0 Hz).
But with …BW MANUAL softkeys the selected values apply to both the frequency
and time domain.