Analyzer - Bandwidths and Sweep Time R&S ESCI
1166.6004.12 4.84 E-1
SWEEPTIME
AUTO
The SWEEPTIME AUTO softkey couples the sweep time to the span, video
bandwidth (VBW) and resolution bandwidth (RBW). The sweep time is
automatically adjusted on any change in span, resolution bandwidth or video
bandwidth.
The softkey is only available in the frequency domain (span >0 Hz). It is
blanked in the time domain.
The R&S ESCI always selects the shortest sweep time possible without
falsifying the signal. The maximum level error compared to using a longer
sweep time is < 0.1 dB. If additional bandwidth and level errors are to be
avoided, the sweep time is to be set to three times the time offered in coupled
mode.
IEC/IEEE-bus command: SWE:TIME:AUTO ON
COUPLING
RATIO
RBW / VBW
PULSE [.1]
RBW / VBW
SINE [1/3]
RBW / VBW
NOISE [10]
SPAN / RBW
AUTO [50]
RBW / VBW
MANUAL
SPAN / RBW
MANUAL
The COUPLING RATIO softkey opens a sub menu 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 corresponds to SPAN / RBW
AUTO [50]) and the ratio resolution bandwidth/video bandwidth
(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 COUPLING 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 x resolution bandwidth.
This is the default setting for the coupling ratio resolution
bandwidth/video bandwidth.
This is the coupling ratio recommended if sinusoidal signals are
to be measured.
IEC/IEEE-bus command BAND:VID:RAT 3
This setting is only effective for the VBW AUTO selection in the
main menu.
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