Keysight Technologies N9340B User Manual page 51

Decreasing the Resolution Bandwidth
Resolution bandwidth settings affect the level of internal
noise without affecting the amplitude level of continuous
wave (CW) signals. Decreasing the RBW by a decade
reduces the noise floor by 10 dB.
1 Refer to
and follow steps 1, 2 and 3.
2 Decrease the resolution bandwidth:
• Press [BW/SWP], and toggle RBW setting to Man
(manual), then decrease the resolution bandwidth
using the knob, the arrow keys or the numeric
keypad.
The low level signal appears more clearly because the
noise level is reduced.
Figure 4-8 Decreasing resolution bandwidth
"Reducing Input Attenuation" on page
Making Measurements
Measuring a Low-Level Signal
29,
45