Measuring A Low-Level Signal; Reducing Input Attenuation - Keysight Technologies N9322C User Manual

Functions and Measurements

Measuring a Low-Level Signal

Measuring a Low-Level Signal

Reducing Input Attenuation

C A U T I O N
44
This section provides information on measuring low- level
signals and distinguishing them from spectrum noise.
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.
Ensure that the total power of all input signals at the analyzer RF input
does not exceed +30 dBm (1 Watt).
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
Signal Generator
N9310A RF Signal Generator 9 kHz - 3.0 GHz
Remote
Standby
On
RF OUT
Spectrum Analyzer
FUN CTIONS N 9320A SPECTRUM ANALYZER
Frequency AM I/ Q Utility Preset
Amplitude FM Sw eep File Local
Enter M Pulse Trigger LF Out
7 8 9
M OD
On/ Off
4 5 6
1 2 3
0 ·
RF
On/ Off
Remote
LF OUT RF OUT 50
Standby
On
REV ERSE PWR
4W M AX 30VDC
9 kHz - 3.0 GHz
Auto BW/ Sw eep/
Tune Avg Trig
Local
V iew / Det/ File/
M arker
Trace Display Print
Save
Marker Peak
M ODE M eas
Search
7 8 9
4 5 6
1 2 3 Back
0 · Enter
50VDC M AX
30dBm 1W M AX
TG SOURCE CAL OUT RF IN 50
50M Hz 10dBm PROBE POW ER CAT Ⅱ
RF IN