Decreasing The Resolution Bandwidth - Keysight X Series Measurement Manual

Decreasing the Resolution Bandwidth

Resolution bandwidth settings affect the level of internal noise without affecting the
level of continuous wave (CW) signals. Decreasing the RBW by a decade reduces
the noise floor by 10 dB.
Step
1 Set up the signal generator.
2 Connect the source RF
OUTPUT to the analyzer
RF INPUT as shown.
3 Select the mode.
4 Preset the mode.
5 Set the center frequency,
span and reference level.
Action
a. Set the frequency to 300
MHz.
b. Set the amplitude to
−80 dBm.
• Press Mode, Spectrum
Analyzer.
• Press Mode Preset.
a. Press FREQ Channel,
Center Freq, 300, MHz.
b. Press SPAN X Scale,
Span, 50, MHz.
c. Press AMPTD Y Scale,
Ref Level, 40, −dBm.
47
Measuring a Low−Level Signal
Decreasing the Resolution Bandwidth
Notes
See Figure 3-3.