R&S FS300, Operating Manual

Page: 126 / 248

Spectrum Analyzer R&S FS300
E-1007.9900.15 6-126 Operating manual, 02/2006
6.2.4.3.2 Switching Over the Coupling RBW/SPAN to Low Noise
Use
You can change the automatic coupling between frequency display span
(SPAN) and resolution bandwidth (RBW) by means of the RBW/SPAN LOW
NOISE function. This makes it possible to increase the measurement
sensitivity of the analyzer in comparison to the normal setting.
If the span is < 1 GHz in the Low Noise setting, the setting for the resolution
bandwidth is as shown in the following table:
SPAN RBW
SPAN > 1 GHz 1 MHz
1 GHz ≥ SPAN > 50 MHz 300 kHz
50 MHz ≥ SPAN > 10 MHz 100 kHz
10 MHz ≥ SPAN > 5 MHz 30 kHz
5 MHz ≥ SPAN > 1 MHz 10 kHz
1 MHz ≥ SPAN > 200 kHz 3 kHz
200 kHz ≥ SPAN > 100 kHz 1 kHz
100 kHz ≥ SPAN > 50 kHz 500 Hz
50 kHz ≥ SPAN > 20 kHz 300 Hz
20 kHz ≥ SPAN > 1 kHz 200 Hz
Switching on the
coupling RBW/SPAN
LOW NOISE
•
Press the
function key
in the
submenu
.
The ratio between frequency display span (SPAN) and resolution
bandwidth (RBW) is set consequently.
The setting is indicated by the letters LN next to the RBW display.
Switching off the
coupling RBW/SPAN
LOW NOISE
•
Press the
function key
in the
submenu
.
The ratio between frequency display span (SPAN) and resolution
bandwidth (RBW) is set normally and provides the shortest possible
sweep times for a set SPAN.
The letters LN next to the RBW display are blanked out.