Filter
Top Products
Change
stepll
as
follows:
6. Check
Reslduat FM
[Within
7 kHz over
20 ms
with the 1st
LO unlocked
(SPAN/DIV
>200 kHz for
band
1 and
bands
5 rhrough
12
and SPAN/DIV
>100
kHz for bands
2 rhrough
4)1.
[Within
(5
+ N)Hz
over
20 ms with
rhe
1st
LO locked
(SPAN/DIV
s200 kHz
for band
1
and bands
5lhrough
12
and SPANiDIV
<100
kHz tor
bands
2 rhrough
4)1.
Change
'f-"
to read
as follows:
f, ll SAVE
A
was
used
in
part
e, de-activate
SAVE
A and
VIEW
B.
Activate
ZERO SPAN,
set
TIME/DIV
ro
20
ms,
and
set
CENTER
FREQUENCY
control
to
posirion
the display
nearcenterscreen
as shown
in Figure
4-5B.
Use SAVEAto
f reeze
the
display
for ease in
measuring
FM.Forthe
example
in
Figure
4-5,
the vertical
amplitude (gp)
over
each
20
ms
sweep
inleryal
(1
div.)
can
vary
by no
more
th an7
kHz
(O-7
div)
Replaee stepl7
wtth the tollowlng:
11.
Check Resolutlon Bandwldlh
and
Shape Factor
(bandwidlh
is
within 2O%
ot lhe
selected bandwidth
except for 10 Hz. Shape
factor is 7.5:1
or
less
exceptlor
1
0 Hz. 1 0 Hz bandwidth <150
Hz
@
-60
dBc.
a.
Apply the
CAL
OUT signalto the RF
INPUT. Set the
Spec{rum Analyzer
controls as
follows:
CENTER
FREOUENCY
SPAN/DIV
RESOLUTION BANDWIDTH
REF LEVEL
VEHTICAL
DISPLAY
MIN NOISE
PEAI(AVERAGE
TIME/DIV
TRIGGERING
'lO0
MHz
l MHz
3 MHz
-20
dBm
2
dB/DIV
Activated
Fully
Clockwise
AUTO
FREE RUN
o
o
3
o
o
o
t
)
o
O
I
a
o
)
o
o
o
I
o
a
o
t
o
o
o
o
o
o
e
I
o
t
I
o
o
t
C
a
a
o
o
o
a
o
b. Measure 6 dB bandwidth
for each
Resolulion Band-
width
as follows:
(1)
Activate MARKER
MENU
pushbutton.
(2)
Select'7
-
ENTER BANDWIDTH
NUMBER"
(3)
Enter
"6"
with the keypad
and terminate with
"dB'.
(4)
Activate BAND WIDTH mode
pushbutton
(<green-
sHtFT>BAND WTDTH).
(5)
From the inlormation
displayed on lhe CRT, record
the 6 dB bandwidth in Table 44.
NOTE
Span
Arcurary is not a lactor
when using
the
bandwidth
mode.
(6)
Check that the
recorded value for the
6
dB
bandwidth is within the limits as
specified in Table
44.
(7)
Using the values in Table
4A, measure the
6
dB
bandwidlh
lor all
remaining
RESOLUTION
BAND-
WIDTH settings
(except
10 Hz).
c. Measure
the 60
dB bandwidth for each Resolution
Bandwidth as
follows:
(1
)
Set the Spectrum Analyzer controls
as
follows:
SPAN/DIV l MHz
RESOLUTION
BANDWIDTH 3 MHz
VERTICAL DISPLAY 1O
dBIDIV
WIDE VIDEO FILTER Activated
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Typlcal
dlsptay
for
measurlng
resldual
FM