Agilent Technologies HP 83711A - Page 147

L
VL
CR
ON/OFF
The
L
VL
CR
ON/OFF
(level
correct
on/o)
function
(
4
SHIFT
5
,
4
PO
WER
LEVEL
5
)
toggles
the
level
correct
function
on
and
o.
When
the
level
correct
function
is
on,
the
L
VL
COR
annunciator is
lit and
the
data
in
the
current
level
correction
table
is
used
to
change
the power
level
of
the
synthesizer
.
The
current
level
correction
table
is
either
the last
level
correction
that
was
run
or
the
last
table
recalled
from
one
of
the
four level
correction
register
locations
.
The
level
correct
function
compensates
for
path
loss
measured
during the
level
correct
routine
and
changes
power
levels
accordingly
.
Thus,
power is
at
and
leveled
over
the
range
of
frequency
points
where data
was measured
during
the
routine
.
F
or
example
,
assume
that
the
level correction
factor at
10
GHz
is
0
4dB
(because there
is
4
dB
of
path
loss
between
the
RF
OUTPUT
connector
and
the
test point).
Then, if
0 10
dBm
is
desired
at
10
GHz
(and
the
level
correct
function
is
turned on),
the
synthesizer
actually
generates
0
6
dBm
so
that
the
power
level at
the
test
point
is
0
10
dBm.
Notice
that
path
loss
correction
is
independent
of
power
level.
The
preset
condition
for
this
function
is
o.
Notes
1.
When
level
correction
is
activated
and
more
power
is
required
at
the
RF
OUTPUT
than
the
synthesizer
can
deliver
,
an
error
message
is
generated
and
the
UNL
VL annunciator
lights. This
can
occur
when
the
external
signal
path
has
loss
and
the
power
level
is set
close to
maximum leveled
power
.
2.
If
the
level
correct
function
is
on
and
an
output
frequenc
y
is
requested
from
the
synthesizer
that
is
either greater than the stop frequenc
y
or less than the start frequenc
y, an error message will be
generated and the le
vel correction factor for the requested frequenc
y will be zero (no
correction).
6-35