Agilent Technologies 83640B

10.
Modulator Offset
and Gain
Description
and Procedure
In this
pro cedure,
the ALC
mo dulation
oset and
gain
calibration
constan
ts
are
adjusted
to
linearize
the
ALC
mo
dulator
resp
onse
to
the
ALC
p
o
w
er
lev
el reference
voltage.
Default
v
alues
are
entered
for the
mo dulator
oset calibration
constan
ts
and
in
ternal
rm
w
are
is
activated
to
set
the
mo
dulator
gain
calibration
constan
ts.
The
syn
thesizer
is
then
set
for
a
p
o
w
er
sw
eep
across
the
en
tire
leveled
ALC range
( 0
20 to
the
maxim
um
lev
eled
p
o
w
er).
The
in
tegrator lev
el signal
on the
ALC b
oard
is
monitored
to
v
erify
linearit
y
.
If
necessary
,
the
mo
dulator
oset
v
alues
are
mo
died.
1.
F
or
8360
B-Series
only
,
connect
the
equipmen
tas
shown
in Figure
3-23
.
Preset
the
instrumen
ts and
let them
warm
up
for
at
least
one
hour.
F
or
8360
L-Series,
start
this
test
at
step
2.
Figure 3-23.
Modulator Offset
and
Gain
Adjustment
Setup
Equipment
Digitizing
Oscilloscop
e
HP/Agilen
t 54111D
Oscilloscope Prob es
HP/Agilent 10431A
2. On the syn
thesizer, set:
4
SERVICE
5
NNNNNNNNNNNNNNNNN
NNNNNNNNNNNNNNNNNN
Adjust Menu
NNNNNNNNNNNNNNNNN
NNNNNNNNNNNNNNN
Calib Menu
3. If y
ou ha
ve replaced the
low band assem
bly (A24) or the dual modulator assem
bly
(A38), set the ALC oset calibration constants to the default values given in Table 3-6.
Otherwise, skip to step 7 for 8360 B-Series or skip to the next adjustment for 8360
L-Series.
Select
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
Select Cal . Using the numeric keypad, enter the number of the rst calibration
constantinTable 3-6 . Terminate your entry with the 4
ENTER
5 key.
3-62 Adjustments
Modulator Offset and Gain
Agilent 8360