aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
ALC
DIODE
Selecting
the
NNNNNNNNNNNNNNNNN
Amptd
men
u
and
then
the
NNNNNNNNNNNNNNNNNNNNNNNNNNNNN
ALC
DIODE
softkey
enables
automatic
lev
eling
con
trol
using
an
external
dio
de
detector.
Under
4
INSTR
PRESET
5
( 4
I-P
5)
conditions,
the
ALC
DIODE
function
is
disable
d
,
and
the
ALC
INTERNAL
function
is
enable
d
.
When
the
ALC
DIODE
function
is
active,
it
is
indicated
b
y
underscoring
the
softkey
.
The
display
indicates
that
the
function
is
active
b
y
the
message
\ ALC
Diode ."
External
Diode
Detector
Lev
eling
The
purp ose
of
a
lev
eling
circuit
is
to
pro
vide
constan
t
p o
w
er,
indep enden
t
of
the
load,
and
minimize
p o
w
er
v
ariations
v
ersus
frequency
.
External
dio
de
detector
lev
eling
is
used
in
applications
where
it
is
desired
to
con
tinuously
lev
el
the
p o
w
er
at
some
p oint
outside
the
signal
generator
with
an
external
dio
de
detector.
When
frequency
dep enden
t
losses
are
in
v
olv
ed,
the
RF
output
p o
w
er
at
the
end
of
the
signal
path
will
not
ha
v
e
a
constan
t
amplitude
o
v
er
the
signal
generator
frequency
range.
F
or
example,
if
a
cable
is
used
at
the
output
of
the
signal
generator
that
has
a
constan
t
0.5
dB/GHz
loss,
5
dB
of
attenuation
at
the
output
of
the
cable
o ccurs
after
a
10
GHz
frequency
increase,
ev
en
though
the
p o
w
er
at
the
input
to
the
cable
is
constan
t.
By
externally
lev
eling
p o
w
er
at
the
output
of
the
cable,
the
signal
generator
w
ould
increase
p o
w
er
at
the
input
of
the
cable
to
pro duce
a
constan
t
p o
w
er
lev
el
at
the
output
of
the
cable.
External
dio
de
detector
lev
eling
requires
that
external
equipmen
t
b e
connected
to
the
signal
generator,
as
sho
wn
in
Figure
5-3 .
Figure
5-3.
External
Diode
Lev
eling
Set-up
When
external
dio
de
detector
lev
eling
is
c
hosen,
p o
w
er
is
sampled
at
the
external
sampling
device
(either
a
directional
coupler
or
p o
w
er
splitter)
b
y
an
external
dio
de
detector
that
is
t
ypically
op erating
in
the
square
law
region.
When
the
dio
de
detector
is
op erating
in
the
square
law
region,
it
will
pro
vide
a
DC
v
oltage
that
is
prop ortional
to
the
p o
w
er
sampled
at
the
input
to
the
detector.
This
DC
v
oltage
is
fed
bac
k
to
the
signal
generator
via
the
EXT
ALC
connector.
The
signal
generator
then
adjusts
its
output
p o
w
er
lev
el
to
maintain
a
constan
t
p o
w
er
lev
el
at
the
input
to
the
external
dio
de
detector.
Signal
Generator
Menus
and
Functions
5-7
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