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I
-
Making Measurements Using Spectrum Analyzer Mode
Stimulus-Response Measurements
5. Since we are only interested in the rejection of the low-pass
Iilter,
tune
the spectrum analyzer’s center frequency so that the roll-off of the filter
comprises the majority of the trace on the display (see Figure 5-6).
6. Decrease the resolution bandwidth to increase sensitivity, and narrow
the video bandwidth to smooth the noise. In Figure 5-7, the resolution
bandwidth has been decreased to 10
kHz.
REF
48.8
dBmV
AT
10
dB
PES
PEAK
AUTO
ML\N
LOG
10
dB/
“IO
BW
a
MAN
VBW/RBW
RATIO
VI0
AVG
ON
02
WA
SB
SC
FC
\
CORR
\
‘4
EM1
BW
W”U
I
CENTER
350
.O
MHZ
SPAN
500.0
MHz
#RES
BW
10
kHr
VBW
10
kHz
SWP
15.0
set
Figure
5.7.
Decrease the Resolution Bandwidth to Improve Sensitivity
5-18