
4
ALC
5
Note
Tw
o
terms
are
used
in
the
follo wing
discussions:
p o
w
er
output
and
ALC
lev
el.
P
o
w
er
output
means
actual
output
p o
w
er
including
the
eects
of
the
attenuator.
ALC
lev
el
means
p o
w
er
lev
els
b efore
the
attenuator.
In
sw
ept
signal
generators
without
attenuators,
these
t
w
o
terms
are
equiv
alen
t.
In
ternal
Lev
eling
-
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
Leveling
Mode
Normal
,
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
Leveling
Point
Intrnl
In
this
conguration
( Figure
A-1),
p o
w
er
is
sensed
b
y
a
detector
in
ternal
to
the
sw
ept
signal
generator
and
a
dc
output
from
this
detector
is
fed
bac
k
to
the
L
evel
Contr
ol
Cir
cuits
.
The
ALC
lev
el
is
limited
at
the
low
end
b
y
the
L
evel
Contr
ol
Cir
cuits
and
at
the
high
end
b
y
maxim
um
a
v
ailable
p o
w
er.
Noise
and
drift
limit
the
range
at
the
low
end
to
020
dBm
or
greater.
The
com
bination
of
RF
frequency
and
RF
comp onen
ts
(dierent
mo
dels
of
sw
ept
signal
generator
ha
v
e
dieren
t
RF
comp onen
ts)
limit
the
ALC
range
a
v
ailable
at
the
high
end.
The
in
ternal
instructions
(rmw
are)
of
the
sw
ept
signal
generator
limit
the
ALC
lev
el
range
a
v
ailable
for
request
from
020
to
+25
dBm.
If
the
p o
w
er
lev
el
requested
is
higher
than
the
sw
ept
signal
generator
is
capable
of
pro ducing,
the
maximum
a
v
ailable
p o
w
er
is
pro duced,
and
the
message
line
displays
UNLVLED
(unlev
eled).
When
the
sw
ept
signal
generator
p erforms
frequency
sw
eeps
at
certain
ALC
lev
els,
maximum
a
v
ailable
p o
w
er
can
b e
exceeded
during
small
p ortions
of
the
sw
eep;
in
this
case,
a
ashing
UNLVLED
message
app ears.
ALC
lev
eling
accuracy
dep ends
on
p o
w
er
lev
el.
Although
the
ALC
lev
el
is
useable
from
020
to
+25
dBm,
it
is
most
accurate
from
010
to
+10
dBm.
This
fact
is
reected
in
the
p erformance
sp ecications
of
the
sw
ept
signal
generator.
Coupled
Op eration.
Since
man
y
applications
require
p o
w
er
output
less
than
020
dBm,
an
optional
step
attenuator
has
a
range
of
0
to
90
dB ,
in
10
dB
steps.
With
this
option,
p o
w
er
output
do
wn
to
0110
dBm
is
ac
hiev
ed
when
the
Step
A
ttenuator
and
L
evel
Contr
ol
Cir
cuits
w
ork
in
conjunction
(see
Figure
A-1).
With
the
attenuator,
the
ALC
lev
el
is
normally
used
o
v
er
the
smaller,
more
accurate
p ortion
of
its
range.
Since
ALC
lev
el
accuracy
suers
b elow
010
dBm,
and
at
some
frequencies
only
+1
dBm
of
RF
output
is
a
v
ailable,
the
ALC
lev
el
is
set
b et
w
een
010
and
0
dBm.
F
or
p o
w
er
less
than
0100
dBm,
the
attenuator
is
set
to
90
dB,
and
the
ALC
lev
el
is
used
from
010
to
020
dBm.
A
t
frequencies
where
p o
w
er
output
ab o
v
e
0
dBm
is
desired,
the
attenuator
is
set
to
0
dB,
and
the
ALC
lev
el
is
used
from
0
to
+25
dBm
(or
whatev
er
p o
w
er
is
a
v
ailable
at
the
RF
frequency
in
use).
Coupled
op eration
is
assumed
b
y
the
sw
ept
signal
generator
unless
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
Uncoupl
Atten
or
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
Leveling
Mode
ALCoff
is
selected.
The
prop er
com
bination
of
ALC
lev
el
and
attenuator
setting
is
decided
b
y
the
A-6
Operating
and
Programming
Reference
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