Functions and Measurements 3
N9342C/43C/44C User’s Guide 37
Measuring a Low-Level Signal
This section provides information on measuring
low- level signals and distinguishing them from
spectrum noise. There are four techniques used to
measure low- level signals.
Reducing Input Attenuation
The ability to measure a low- level signal is limited
by internally generated noise in the spectrum
analyzer.
The input attenuator affects the level of a signal
passing through the analyzer. If a signal is very
close to the noise floor, reducing input attenuation
will bring the signal out of the noise.
1 Preset the analyzer:
2 Input a signal (1 GHz, –80 dBm) to RF IN.
3 Set the CF, span and reference level:
• Press [FREQ] > 1 > {GHz}
• Press [SPAN] > 5 > {MHz}
• Press [AMPTD] > –40 > {dBm}
4 Move the desired peak (1 GHz) to the center of
the display:
• Press [Peak]
• Press [MARKER] > {Marker To} > {To Center}
Figure 3-6 A signal closer to the noise level (Atten: 10 dB)
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