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39
Functions and Measurements
Measuring Multiple Signals
Resolving Signals of Equal Amplitude
In this example a decrease in the resolution bandwidth
(RBW) is used in combination with a decrease in video
bandwidth (VBW) to resolve two signals of equal amplitude
with a frequency separation of 100 kHz.
Figure 3-4 Setup for obtaining two signals
Notice that the final RBW selection to resolve the signals is
the same width as the signal separation while the VBW is
slightly narrower than the RBW.
1
Connect two sources to the analyzer input as shown above.
2
Set one source to 300 MHz. Set the frequency of the other
source to
300.1 MHz. Set both source amplitudes to –20 dBm.
3
Setup the analyzer to view the signals:
Press
Preset
(With
Preset Type
of
Factory
)
Press
Frequency > 300 > MHz
Press
BW > 300 > kHz
Press
Span > 2 > MHz
A single signal peak is visible. See
Figure 3-5
for example.
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
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 MAX 30VDC
LF OUT RF OUT 50
FUNCTIONS
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 Signal Generator Spectrum Analyzer
Directional Coupler
RF OUT
RF IN
RF OUT