
4
ALC
5
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
Leveling
Point
PwrMtr
Sets
the
sw
ept
signal
generator
to
lev
el
p o
w
er
at
an
external
p o
w
er
meter.
A
p o
w
er
meter's
recorder
output
m
ust
b e
connected
to
the
EXT
ALC
input.
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
Pwr
Mtr
Range
Sp ecies
the
op erating
range
of
an
external
p o
w
er
meter
used
in
an
external
lev
eling
setup.
This
causes
the
sw
ept
signal
generator
display
to
agree
with
the
p o
w
er
meter's
p o
w
er
indication.
The
following
paragraphs
explain
the
p o
w
er
con
trol
(leveling)
function
of
the
sw
ept
signal
generator
in
detail.
ALC
SYSTEM
-
O
VER
VIEW
The
ALC
system,
referred
to
as
a
system
b ecause
it
encompasses
more
than
one
functional
area,
is
sho
wn
as
a
simplied
blo
c
k
diagram
in
Figure
A-1.
The
purp ose
of
this
system
is
to
con
trol
the
amplitude
or
p o
w
er
lev
el
of
the
RF
energy
generated
b
y
the
sw
ept
signal
generator.
It
is
a
feedbac
k
con
trol
system,
in
whic
h
the
output
p o
w
er
is
measured
and
compared
to
the
desired
p o
w
er
lev
el.
If
the
output
p o
w
er
do es
not
equal
the
desired
p o
w
er
lev
el,
the
ALC
system
c
hanges
the
output
un
til
they
are
equal.
Desired
p o
w
er
lev
el
can
b e
set
b
y
either
fron
t
panel
or
remote
op eration.
As
sho
wn
in
Figure
A-1,
the
inputs
and
calibration
data
are
pro cessed
b
y
the
sw
ept
signal
generator
CPU,
whic
h
uses
this
information
to
set
the
L
evel
D
A
C
.
In
turn,
the
L
evel
D
A
C
sends
a
con
trolling
v
oltage
to
the
L
evel
Contr
ol
Cir
cuits
.
In
the
presence
of
mo
dulation,
v
oltages
app earing
at
the
AM
and/or
PULSE
inputs
con
tribute
to
the
con
trol
of
the
L
evel
Contr
ol
Cir
cuits
.
In
sw
ept
signal
generators
with
optional
step
attenuators,
the
p o
w
er
lev
el
at
the
output
connector
can
b e
reduced
b
y
a
maximum
of
90
dB,
in
10
dB
steps.
This
is
in
addition
to
the
con
trol
capabilities
pro
vided
b
y
the
L
evel
Contr
ol
Cir
cuits
.
A
F
e
e
db
ack
Signal
to
the
L
evel
Contr
ol
Cir
cuits
can
b e
pro
vided
b
y
either
in
ternal
or
external
detectors.
This
signal
is
the
comparison
v
oltage
necessary
for
accurate,
stable,
p o
w
er
lev
el
settings
and
go
o d
source
match
at
v
arious
L
eveling
Points
.
Alternativ
ely
,
the
p o
w
er
lev
el
can
b e
set
without
using
feedbac
k.
In
this
mo
de
ho
w
ev
er,
p o
w
er
lev
el
is
uncalibrated
and
is
sub
ject
to
drift
with
temp erature.
The
following
paragraphs
describ e
the
op eration
of
the
dieren
t
lev
eling
mo
des
and
lev
eling
p oints.
A-4
Operating
and
Programming
Reference
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