R&S FSL Setting the Bandwidths and Sweep Time – BW Key
1300.2519.12 4.23 E-11
Video BW Auto (not available for FFT filter)
Couples the video bandwidth to the resolution bandwidth. If the resolution bandwidth is changed,
the video bandwidth is automatically adjusted.
This setting is recommended, if a minimum sweep time is required for a selected resolution
bandwidth. Narrow video bandwidths require longer sweep times due to the longer settling time.
Wide bandwidths reduce the signal/noise ratio.
Remote: BAND:VID:AUTO ON
Sweeptime Manual (not available for FFT filter)
Opens an edit dialog box to enter the sweep time.
Sweep time Option TV Trigger, B6
(available from version 1.10)
absolute max. sweep time value: 16000 s 100 µs (zero span)
absolute min. sweep time value: 1 µs (zero span) 25 µs (zero span)
2.5 ms (span > 0) –
Allowed values depend on the ratio of span to RBW and RBW to VBW. For details refer to the
data sheet.
Numeric input is always rounded to the nearest possible sweep time. For rotary knob or
UPARROW/DNARROW key inputs, the sweep time is adjusted in steps either downwards or
upwards.
The manual input mode of the sweep time is indicated by a green asterisk (*) at the SWT
display. If the selected sweep time is too short for the selected bandwidth and span, level
measurement errors will occur due to a too short settling time for the resolution or video filters. In
this case, the R&S FSL displays the error message UNCAL and marks the indicated sweep time
with a red asterisk (*).
Remote: SWE:TIME:AUTO OFF
Remote: SWE:TIME 10s
Sweeptime Auto (not available for FFT filter and zero span)
Couples the sweep time to the span, video bandwidth (VBW) and resolution bandwidth (RBW). If
the span, resolution bandwidth or video bandwidth are changed, the sweep time is automatically
adjusted.
The R&S FSL always selects the shortest sweep time that is possible without falsifying the
signal. The maximum level error is < 0.1 dB, compared to using a longer sweep time.
Remote: SWE:TIME:AUTO ON
Filter Type
Opens the Filter Type dialog box to select the filter type.
For detailed information on filters see "To choose the appropriate filter type" on page 4.19 and
"List of available RRC and channel filters" on page 4.20.
Remote: BAND:TYPE NORM
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