When
the
ALC
PO
WER
METER
function
is
on,
p o
w
er
is
sampled
at
the
external
sampling
device
(either
a
directional
coupler
or
p o
w
er
splitter)
b
y
the
external
p o
w
er
sensor.
An
automatic
lev
el
con
trol
v
oltage
is
then
generated
b
y
the
external
p o
w
er
meter
and
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
of
the
external
p o
w
er
sensor.
Applications
External
lev
eling
can
b e
used
when
applications
require
long
cables
that
will
cause
frequency-dep enden
t
losses.
External
lev
eling
also
enables
devices,
suc
h
as
ampliers,
mixers,
etc.
to
b e
inserted
in
to
the
RF
signal
path
so
that
the
output
of
the
inserted
device
is
con
trolled
b
y
the
signal
generator.
External
Equipment
Limitations
The
p o
w
er
meter
m
ust
b e
capable
of
pro ducing
a
0V
to
1V
output
v
oltage
linearly
prop ortional
to
p o
w
er
o
v
er
eac
h
decade
of
range.
The
recorder
output
of
most
p o
w
er
meters
pro
vides
this
v
oltage.
The
p o
w
er
sensor
m
ust
ha
v
e
a
frequency
range
that
is
appropriate
for
the
range
of
frequencies
b eing
lev
eled.
The
sensor
m
ust
also
ha
v
e
enough
dynamic
range
to
measure
the
lev
el
at
the
output
of
the
directional
coupler
or
p o
w
er
splitter.
As
an
example,
to
lev
el
signals
in
the
07
dBm
to
0
dBm
range
using
a
10
dB
coupler,
the
p o
w
er
sensor
m
ust
b e
capable
of
measuring
p o
w
er
in
the
017
to
010
dBm
range.
Adv
antages
of
P
o
w
er
Meter
Lev
eling
When
the
ALC
PO
WER
METER
function
is
used
for
p o
w
er
meter
lev
eling,
p o
w
er
lev
el
correction
is
con
tinuous.
External
p o
w
er
meter
lev
eling
has
the
adv
an
tages
of
b etter
accuracy
and
temp erature
stability
,
and
improv
ed
v
ernier
linearity
than
external
dio
de
detector
lev
eling.
Using
a
sensitive
p o
w
er
sensor
allo ws
ALC
at
lev
els
as
low
as
the
p o
w
er
meter
and
sensor
can
measure.
Disadv
antages
of
P
o
w
er
Meter
Lev
eling
One
disadv
an
tage
of
p o
w
er
meter
lev
eling
is
a
longer
settling
time
than
dio
de
detector
or
in
ternal
lev
eling.
The
settling
time
is
dep enden
t
on
the
p o
w
er
range
and
sensor
used.
The
signal
generator
assumes
a
settling
time
of
t
w
o
seconds
in
order
to
allo
w
the
sensor
to
reac
h
the
correct
p o
w
er
lev
el.
Dep ending
up on
the
p o
w
er
sensor
and
range
b eing
used,
the
p o
w
er
meter
might
or
might
not
nish
settling
within
this
time.
F
or
t
w
o
of
the
p o
w
er
sensor
high
ranges,
the
p o
w
er
meter
t
ypically
settles
within
t
w
o
seconds.
Another
disadv
an
tage
of
external
p o
w
er
meter
lev
eling
is
that
it
can
not
b e
used
when
the
output
is
b eing
pulse
mo
dulated.
External
p o
w
er
meter
lev
eling
requires
that
external
equipmen
t
b e
connected
to
the
signal
generator.
Note
Before
selecting
ALC
PO
WER
METER,
y
ou
should
adjust
the
p o
w
er
lev
el
using
in
ternal
lev
eling
(ALC
INTERNAL)
so
that
the
step
attenuator
is
set
to
the
correct
setting.
5-12
Signal
Generator
Menus
and
Functions
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com
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