Agilent Technologies HP 83711A - Page 133

Ke
ys/Shifted
Functions
EXT METER
the
output
of
the
cable
occurs
after
a
10
GHz
frequency
increase
,
even
though
the
power
at
the
input
to
the
cable
is
constant.
By
externally
leveling
power
at
the
output
of
the
cable
,
the
synthesizer
would
increase
power
at
the
input
of
the
cable
to
produce
a
constant
power
level
at
the
output
of
the
cable
.
External
power
meter
leveling
requires
that
external
equipment
be
connected
to
the
synthesizer
,
as
shown
in
Figure
6-2
.
Figure
6-2.
External
P
ower
Meter
Leveling
Setup
When
external
power
meter
leveling
is
chosen,
power
is sampled
at
the
external
sampling
device
(either
a
directional
coupler
or
power splitter)
by the
external power
sensor
.
An
automatic
level
control
voltage
is
then
generated by
the external
power
meter
and
fed
back
to
the
synthesizer
via
the ALC
IN connector
. The
synthesizer
then
adjusts
its
output
power
level
to
maintain a
constant power
level at
the
input
of
the
external
power
sensor
.
6-21