HP 8753D - Page 282

P
ower
Coupling
Options
There
are
two
methods
you
can
use
to
couple
and
uncouple power
levels with
the HP
8753D:
channel
coupling
port
coupling
By
uncoupling
the
channel
powers
,
you
eectively
have
two
separate sources
. Uncoupling
the
test
ports
allows
you
to
have
dierent
power
levels on
each port.
Channel
coupling
N
N
N
N
N
N
N
N
N
N
N
N
N
NN
NN
NN
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
NN
NN
NN
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
CHAN
POWER
[COUPLED]
toggles
between
coupled
and
uncoupled
channel
power
.
With the
channel power
coupled, the
power levels
are
the
same
on
each
channel.
With
the
channel
power uncoupled,
you
can
set
dierent
power
levels
for
each
channel.
F
or
the
channel
power to
be
uncoupled,
the
other
channel
stimulus
functions
must
also
be
uncoupled
(
N
N
N
NN
NN
NN
NN
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
NN
NN
NN
NN
N
N
N
N
N
N
N
N
COUPLED
CH OFF
).
T
est
port
coupling
N
N
N
N
N
N
N
N
N
NN
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
NN
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
NN
N
PORT
POWER
[COUPLED]
toggles
between
coupled
and
uncoupled
test
ports
.
With
the
test
ports
coupled,
the
power
level
is
the
same
at
each port.
With the
ports uncoupled,
you
can
set
a
dierent
power
level
at
each
port.
This
can be
useful, for
example,
if you
want
to
simultaneously
perform
a
gain
and
reverse
isolation
measurement
on
a
high-gain
amplier using
the
dual
channel
mode to
display the
results
.
In
this
case
,
you
would
want
the
power
in
the
forward
direction
(S
21
)
much
lower
than the
power in
the
reverse
direction
(S
12
).
Application and Operation Concepts 6-15