HP 8591C Manuel d'utilisateur Page 169

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Vue de la page 168
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Making Basic Measurements Using Spectrum Analyzer Mode
Resolving Small Signals Hidden by large Signals Using the Resolution Bandwidth Function
If a 30
kHz
filter is used, the 60
dB
bandwidth will be 450
kHz.
Since the
half-bandwidth (225
kHz)
is wider than the frequency separation, the signals
most likely will not be resolved. See Figure 4-5. (To determine resolution
capability for intermediate values of amplitude level differences, consider the
hlter
skirts between the 3
dB
and 60
dB
points to be approximately straight.
In this case, we simply used the 60
dB
value.)
REF
PEAK
LOG
10
dB/
WA
St
SC
F(
COW
3
4
MKR
300.010
MHz
I
CENTER
SRES
300.000
EW
30
MHz
kHr
“SW
30
CHZ
SPAN
SWP
2
000
20
msec
MHZ
Figure 4-5. Signal Resolution with a 30
kHz
Resolution Bandwidth
4-8
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