Agilent Technologies 4395A - Page 78

Step
2:
Setting
up the
4395A
Setting
the
A
ctive
Channel
Because
the
4395A
has
two
measurement
channels
you
can
have
two dierent
measurement
setups
at
the
same
time
.
To
change the
active channel
to channel
1:
In
the
A
CTIVE
CHANNEL
block, press
4
Chan
1
5
.
V
erify
the
Chan
1
active channel
indicator
lights.
Note
Changing
the
analyzer
type
presets
the 4395A
for the
active channel.
If
you
want
to keep
the current
measurement
settings
when
changing
the
analyzer
type
,rst
set the
other
channel
to
active
.
Selecting
the
Input
The
4395A
uses
three
inputs
for
network
measurements
(R,
A,
and
B).
Usually
,
the
R
input
is
connected
to
the
RF
OUT
signal
directly
,
the
A
input
measures the
reected
signal
from
the
DUT
,
and
the
B
input
measures
the
signal
through
the
DUT.
This
example
assumes
you
are
using
the
T/R
test
set.
Therefore
, because
you are
going
to
measure
the
transmission
characteristics
of
the
DUT
,
select
B/R
to
measure the
ratio of
B
and
R
inputs
.
When
you use
the S-parameter
test set,
you can
measure
the
forward
and
reverse
characteristics
of
a
2-port device
without reconnecting
the inputs
.
In
that
case
,
select
S
21
for
a
transmission
measurement
in
the forward
direction.
3-6 Quick Start Guide