Keysight Technologies N9340B User Manual page 50

Making Measurements
Measuring a Low-Level Signal
5 Reduce the span to 1 MHz and if necessary re-center
the peak.
•
6 Set the attenuation to 20 dB. Note that increasing the
attenuation moves the noise floor closer to the signal
level.
•
Figure 4-6 A signal closer to the noise level (Atten: 20 dB)
7 Press [AMPTD] >{Attenuation} > 0 > {dB} to set the
attenuation to 0 dB.
Figure 4-7 A signal closer to the noise level (Atten: 0 dB)
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Press [SPAN] > 1 > {MHz}
Press [AMPTD] > {Attenuation} > 20 > {dB}