R&S ESU Series - Page 146

Operating Manual 1302.6163.12 - 03 4.115
R&S ESU Instrument Functions
Analyzer Mode
COUPLING
RATIO
The COUPLING RATIO softkey opens a submenu for selection of the coupling ratios.
When the default setting is active, i.e. the COUPLING RATIO softkey is deactivated
(not highlighted), the ratio span/resolution bandwidth (SPAN/RBW) is 50 (this corre-
sponds to SPAN / RBW AUTO [50]) and the ratio resolution bandwidth/video band-
width (RBW/VBW) is 0.33 (this corresponds to RBW / VBW SINE [1/3]).
If the ratio RBW/VBW or SPAN/RBW is different from the default setting, the COU-
PLING RATIO softkey is highlighted.
The softkeys RBW/VBW... are selection keys. Only one softkey can be enabled at
any one time. The softkeys are only effective for the VBW AUTO selection in the
main menu.
The softkeys SPAN/RBW... are also selection keys. They are only effective for the
RBW AUTO selection in the main menu.
RBW / VBW
SINE [1/3]
The RBW | VBW SINE [1/3] softkey sets the following coupling ratio:
video bandwidth = 3 × resolution bandwidth.
This is the default setting for the coupling ratio resolution bandwidth/video band-
width.
This is the coupling ratio recommended if sinusoidal signals are to be measured.
Remote command: BAND:VID:RAT 3
This setting is only effective for the VBW AUTO selection in the main menu.
RBW / VBW
PULSE [0.1]
The RBW | VBW PULSE [0.1] softkey sets the following coupling ratio:
video bandwidth = 10 × resolution bandwidth or
video bandwidth = 10 MHz (= max. VBW).
This coupling ratio is recommended whenever the amplitudes of pulsed signals are
to be measured correctly. The IF filter is exclusively responsible for pulse shaping.
No additional evaluation is performed by the video filter.
Remote command: BAND:VID:RAT 10
This setting is only effective for the VBW AUTO selection in the main menu.
RBW / VBW
NOISE [10]
The RBW/VBW NOISE [10] softkey sets the following coupling ratio:
video bandwidth = resolution bandwidth/10
At this coupling ratio, noise and pulsed signals are suppressed in the video domain.
For noise signals, the average value is displayed.
Remote command: BAND:VID:RAT 0.1
RBW / VBW SINE [1/3]
RBW / VBW PULSE [0.1]
RBW / VBW NOISE [10]
RBW / VBW MANUAL
SPAN / RBW AUTO [50]
SPAN / RBW MANUAL