T
o
Generate
an
A
C
FM
Signal
Y
ou
can
generate
an
A
C
coupled
frequency
mo
dulated
(A
C
FM)
signal
at
an
y
carrier
frequency
within
the
signal
generator
output
frequency
range.
A
C
coupling
is
useful
when
the
mo
dulating
signal
has
a
minimum
rate
of
greater
than
1
kHz
in
order
to
ac
hiev
e
frequency
accuracy
and
stability
.
Generating
an
A
C
FM
signal
requires
the
follo
wing
external
equipmen
t.
Equipmen
t
Requirements
Mo dulating
Signal
Source
Mo dulating
signal
lev
el
must
b e
in
the
range
of
+2V
to
02V
for
sp ecied
FM
p erformance.
Figure
3-1.
A
C
FM
Equipment
Setup
Caution
The
mo
dulating
signal
m
ust
nev
er
exceed
610V
or
damage
to
the
input
can
o ccur.
The
input
imp edance
of
the
EXT
FM
connector
is
600.
1.
Connect
the
equipmen
t
as
sho
wn
in
Figure
3-1 :
2.
Select
the
NNNNNNNNNNNNNNNNN
Amptd
men
u.
3.
Select
the
NNNNNNNNNNNNNNNNNNNNNNN
ALC
INT
function
in
order
to
enable
in
ternal
lev
eling.
4.
Set
FM
coupling
to
A
C,
if
necessary
.
P
erform
the
follo wing
pro cedure
to
set
FM
coupling
to
A
C.
a.
Select
the
NNNNNNNNNNNNNN
Misc
men
u.
b.
Select
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
MORE
1
of
2
to
see
more
functions.
c.
Set
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
FM
TYPE
AC
DC
to
A
C .
5.
T
urn
frequency
mo
dulation
on.
T
o
turn
FM
on,
p erform
the
following
steps:
a.
Select
the
NNNNNNNNNNNNNNNNNNNNNNN
Modultn
men
u.
b.
T
urn
NNNNNNNNNNNNNNNNNNNNNNNNNNNNN
FM
On
Off
On.
When
frequency
mo
dulation
is
turned
on,
the
display
sho
ws:
FM
ON .
3-4
Generating
Signals
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