User`s guide

Making Measurements 4
N9340B User’s Guide 45
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 “Reducing Input Attenuation" on
page 43, 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 4-9 Decreasing resolution bandwidth