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Making Basic Measurements Using Spectrum Analyzer Mode
Resolving Signals of Equal Amplitude Using the Resolution Bandwidth Function
PEAK
LOG
10
dB/
PEAK
LOG
10
dB/
RES
BW
WA SF!
SC
FC
CORR
I
CENTER
300.000
MHZ
SPAN
2.000
MHZ
#RES
BW
100
)tHZ
“BW
30
km
SWP
20.0
nlsec
EM1
BW
Men”
Figure 4-2. Resolving Signals of Equal Amplitude
As the resolution bandwidth is decreased, resolution of the individual signals
is improved and the sweep time is increased. For fastest measurement times,
use the widest possible resolution bandwidth. Under preset conditions, the
resolution bandwidth is “coupled” (or linked) to span.
Since the resolution bandwidth has been changed from the coupled value,
a
I‘#”
mark appears next to RES
EW
in the lower-left corner of the screen,
indicating that the resolution bandwidth is uncoupled. (Also see the
CAUTO
COUPLE_) key description in Chapter 6.)
NOTE
To resolve two signals of equal amplitude with a frequency separation of 200
kHz,
the resolution
bandwidth must be less than the signal separation, and resolution of 100
kHz
must be used. The next
larger filter, 300
kHz,
would exceed the 200
kHz
separation and would not resolve the signals.
4-5