User`s guide

Functions and Measurements 3
N9320A Spectrum Analyzer 39
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 9 Setup for obtaining one signal
CAUTION
Ensure that the total power of all input signals at the analyzer RF input
does not exceed +30 dBm (1 Watt).
Preset/
System
Remote
Standby
On
TG SOURCE CAL OUT
50MHz 10dBm
7
·
4
1
0
2
5
89
6
3
Back
Ent er
Marker
Peak
Search
Marker
Auto
Tune
Det/
Display
File/
Print
BW/
Avg
View/
Trace
MeasMODE
Sweep/
Trig
Local
Save
N9320A SPECTRUM ANALY ZER 9 kHz - 3 .0 GHz
PROBE POWER
RF IN 50
50VDC MAX
30dBm 1W MAX
CAT Ⅱ
Frequency
Enter
7
MOD
On/Of f
RF
4
1
0
2
9
6
3
On/Off
Amplitude
FM
Utility
LF Out
Preset
Local
AM I/Q
File
TriggerPulseM
·
Sweep
8
5
Remot e
Standby
On
N9310A RF Signal Generator 9 kHz - 3.0 GHz
REVERSE PWR
4W MA X 30V D C
LF OUT RF OUT 50
FUN CT IO N S
Signal Generator
Spectrum Analyzer
RF OUT
RF IN