HP 8591C Manual de usuario Pagina 190

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Making Basic Measurements Using Spectrum Analyzer Mode
Measuring low-level Signals Using Attenuation, Video Bandwidth, and Video Averaging
3. To set the number of samples, use the number/units keypad. For example,
press VID AVG
OM
OFF (so that ON is underlined), 25 (Hz). Turn
video averaging off and on again by pressing VID AVG ON OFF (OFF),
VID AVG
OM
OFF (ON).
The number of samples equals the number of sweeps in the averaging
routine.
During averaging, the current sample appears at the left side of the
graticule. Changes in active functions settings, such as the center
frequency or reference level, will restart the sampling. The sampling will
also restart if video averaging is turned off and then on again.
Once the set number of sweeps has been completed, the spectrum
analyzer continues to provide a running average based on this set number.
MKR
100.15
MHZ
REF
48.8
dBnl”
AT
10
dB
-4.75
dBnl"
:z
jllj//l
I
10
/
I I I I I I I
dB'
I
I
VIDEO
AVF
I
I
I I I
I
25
I I
I I
AVG
25
WA
SB
SC
FC
CORR
~
OJ
OFF
NORMLIZE
POSITION
A
<--->
B
SPAN 10.00 MHZ
RES BW
100
kHZ
“BW
30
kHL
SWP
20.0 m5ec
Figure 4-19. Using the Video Averaging Function
4-29
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