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Functions and Measurements
Measuring a Low-Level Signal
44
Measuring a Low-Level Signal
This section provides information on measuring low- level
signals and distinguishing them from spectrum noise.
Reducing Input Attenuation
The ability to measure a low- level signal is limited by
internally generated noise of the spectrum analyzer. The
analyzers input attenuator affects the level of a signal
passing through the analyzer. If a signal power level is close
to the noise floor, reducing the analyzer input attenuation
will help raise the signal so that it can be seen rising out of
the noise.
1
Preset the analyzer
Press
Preset
(With
Preset Type
of
Factory
)
2
Set the source frequency to 300 MHz, amplitude to –70 dBm.
Connect the source
RF OUT
to the analyzer
RF IN
.
Figure 3-9 Setup for obtaining one signal
CAUTION
Ensure that the total power of all input signals at the analyzer RF input
does not 30 dBm (1 Watt).
Remote
Standby
On TG SOURCE CAL OUT
50M Hz 10dBm
7
·
4
1
0
2
5
8 9
6
3 Back
Enter
M arker
Peak
Search
Marker
Auto
Tune
Det/
Display
File/
Print
BW/
Avg
V iew /
Trace
M eas M ODE
Sw eep/
Trig
Local
Save
N9320A SPECTRUM ANALYZER 9 kHz - 3.0 GHz
PROBE POW ER
RF IN 50
50VDC M AX
30dBm 1W M AX
CAT Ⅱ
Frequency
Enter
7 M OD
On/ Off
RF
4
1
0
2
9
6
3
On/ Off
Amplitude
FM
Utility
LF Out
Preset
Local
AM I/ Q
File
Trigger Pulse M
·
Sweep
8
5
Remote
Standby
On
N9310A RF Signal Generator 9 kHz - 3.0 GHz
REV ERSE PWR
4W M AX 30VDC
LF OUT RF OUT 50
FUNCTIONS
Signal Generator Spectrum Analyzer
RF OUT
RF IN