Keysight Technologies N9321C, User Manual

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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
DFT
)
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
3 Set the center frequency, span and reference level:
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 OU T
50M Hz 10dBm
7
·
4
1
0
2
5
8 9
6
3 Back
Enter
M arker
Peak
Search
M arker
Auto
Tune
Det/
Display
File/
Print
BW /
Avg
View /
Trace
Meas MODE
Sw eep/
Trig
Local
Save
N9320A SPECTRUM ANALYZER 9 kHz - 3.0 GHz
PROBE POWER
RF IN 50
50V DC 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