Agilent Technologies 8590 L-Series Guia do Utilizador Página 57

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3. Set the source to 300.2 MHz, so that the signal is 200 kHz higher than the calibration signal.
Set the amplitude of the signal to -80 dBm (60
dB
below the calibration signal).
4. Set the 300 MHz signal to the reference level by pressing
[PEAK
SEARCH),
[MKR),
then
MARKER -+REF LVL .
If a 10 kHz filter with a typical shape factor of 15: 1 is used, the filter will have a bandwidth
of 150 kHz at the 60
dB
point. The half-bandwidth (75
kHz)
is narrower than the frequency
separation, so the input signals will be resolved.
4-J
MKR
300.010 MHz
REF
-23
7
dBrn AaTTEN
10
dB
0
-23 86
dBm
PEAK
LOG
10
dB/
MARKER
300.010 MHz
-23.86
dBm
CENTER
300
000
MHZ
SP,%hl
2
000
MHZ
RES
EW
10
kHZ
YBW
10
kHZ
SW 60
msec
Figure 3-4. Signal Resolution with a 10
kHz
Resolution Bandwidth
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 3-5. (To determine resolution capability for intermediate values of amplitude level
differences, consider the filter skirts between the 3
dB
and 60
dB
points to be approximately
straight. In this case, we simply used the 60
dB
value.)
4
MKR
300
010 MHz
REF
-23
7
dBm
ATTEN
10
dB
0
-23 87
dBm
PEPK
LOG
In
,1!
I
IW
dB/
i \
.-
RES
EW
30
kHZ
\
CENTER
3Ub3.000
MHz
SPAN 2
000 MHz
#RES
BW
38
kHL “BW
30
kHL
SW
20
msec
Figure 3-5. Signal Resolution with a 30
kHz
Resolution Bandwidth
Making Basic Measurements 3-5
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