Filter
Top Products
Adlustnent
Procedure
-
494ful4g4Ap
Servtce
Vot. 1
Flgure
5-16. 100
kHz
over l0 kHz
litter
respona€.
(1)
Set
the,
foltowing
adjustments
to midrange:
R4025 on
the
VR
2nd
Fitter
Select
board,
and
R3OIO
'and
R3025
in
the
10Hz/100H2
Bandpass
Fitter
assembly.
(2)
Install
jumpers
on
J30i5,
JgogS, and
J3052 in
the
10
Hzll00
Hz Fitter
assembty
(Figure
5-ig).
(3)
Apply
the
CAL
OUT
signat
to th€
RF
tNpUT, and
set
the
Spectrum
Analyzer
controls
as follows:
FREQUENCY
100
MHz
FREQ
SPAN/D|V
100
Hz
AUTO
RESOLN
Off
RESOLUTTON
BANDWTDTH
100
Hz
VERT|CAL
DTSPLAY
2
dB/DtV
REFERENCE
LEVEL
-20
dBm
Throughout
the 10
Hz
ftlter
adiustment,
set
the
REFERENCE
LEVEL
as
needed
to main-
tain
a
7-division
excursion
of
the
display.
(4)
Adjust
R4025
on
the
VR
2nd
Filter
Set€ct board
(Figure
5-17)
for
maximum
signal
amplitude.
(5)
Set TIME/D|V
to
50 ms.
(6)
Adjust
Rg0i0 in
the
10
Hzl100 Hz
Bandpass
Fitter
assembty (Figure
5-
18)
for
maximum
signal
amplitude.
0
Adjust
R3025
in
the
10Hz/100H2
Bandpass
Filter assembly
for
maximum
signal
amplitude.
(8)
Remove
the
jumper
from
JO01S
(1st
stage
of
the
bandpass filter)
in
the 10 Hzl100
Hz
Bandpass
Filter
assembly.
s-l6
(9)
Adjust
C1032
in
the
loHz/lfi)Hz
Bandpass
Filter
assembly
for
maximum slgnal amplitude.
(10)
Set the Spectrum Analyzer controls
as
follows:
FREQ
SPAN/DIV
'10
Hz
RESOLUTION
BANDWIDTH 10
Hz
VERTTCAL
DTSPLAY
5 dB/DlV
T|ME/D|V
AUTO
(11)
Press
(Blue-SHIFT>
WIDE
and select
item
#3
CTOGGLE
EOS
CORRECTTON MODE).
(12)
Reset
the
CENTER
FREQUENCY
as necessary
to
center
the
100 MHz
calibrator signal,
then set
the
REFERENCE
LEVEL for
a seven-division
excursion
of the display.
(13)
Activate
SAVE A. Store
s€ttings
in register 1
by
pressing
<Blue-SHIFT>
STORE
1.
(14)
Set the Spectrum Analyzer controls as follows:
FREQ
SPAN/DIV 100
Hz
RESOLUTION
BANDWIDTH 100
Hz
VERTICAL DTSPLAY
10
dB/DlV
VIEW
A
Otr
(15)
Store settings in register 2
by
pressing
<Blue-
SHIFT> STORE
2.
(16)
Adjust C4015 in
the
10Hz/100H2
Bandpass
Filter
assembly
for b€st
symmetry.
(17)
Press RECALL
SETTINGS
1.
(18)
Adjust
C4028 In
the
10Hz/100H2
Bandpass
Filtsr
assembly
to
match th€ trequency of
th€
B
display to that
of
the sAVE
A
display.
(19)
Repeat adiustment of
C4015
and
C4028 to
eliminate
interaction.
(20)
Remove
the
jumper
from
J3038
(2nd
stage
of
the
bandpass filter) and
install
it
on
J3015
in the
10 Hzl100
Hz Bandpass Filter assembly.
(21)
Press RECALL
SETTINGS
1.
(22)
Adjust
C4036
in
the
10Hz/10OHz Bandpass
Filter assembly to matoh
th€ frequency of the
B
display to
that of
the sAvE
A
display.
(23)
Press RECALL
SETTINGS
2.
(24)
Adjust
C4045
in
the
10 Hzl100 Hz Bandpass
Filter
assembly
for best symmetry.
(25)
Repeat
parts
22 through 25
to
eliminate
interaction.
(26)
Remove
the
jumper
from
J3052
(3rd
stage
of
the
bandpass filter) and
install it on
J3038
in
the
10 Hzll00
Hz Bandpass Filter assembly.
(27)
Press RECALL
SETTINGS
1.
(28)
Adjust
C4051
in
the
10Hz/100H2
Bandpass
Filter
assembly
to
match
the
frequ€ncy
of the
B
display to that
of
th€ SAVE
A
display.
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