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HP 416A - Page 39

HP 416A
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3. C
onnect
the
unknown l
oad
to the
output
of
the
reflected
coupl
er
(
Model
S752C).
·
4.
Co
nnect
a
Model
S485A
Waveguide
Detector
Mount
to
t
he
s
ec
ond
a
ry
arrn
of
each
coupler.
The
barretters
for
the
detector
mount
are
packed
separately.
Ins
tall
a
barretter
in
each
detector
mount.
NOTE:
The
barretters
are
delicate
and
should
be
handled
with
great
care.
5.
Connection
between
each
barretter
and
the
Model
416A
must
be
made
through
a
transformer
whi
ch
matches
.
the
impedance
of
the
barretter
to
that
of
the
Model
416A
.
Transformer
assembly
Type
AC-60K
was
specially
designed
for
this
application,
and
may
be
ob
tain
e d {
ro1n
the
Hewlett-Packard
Com
pa
ny.
The
assembly
consists
of
two
irt1pedance
-matching
trans£orrners
housed
in
a
single
container,
the
input
and
output
terminals
for
each,
and
a
bias
current
input
common
to
both
transformers
.
Cables
are
supplied
for
completing
all
connections.
The
Model
416A
includes
a
supply
of
bias
current
for
the
barretters
.
CAUTION
:
While
the
Mo
d
el
416A
is
supplying
bias
cur
:rc
mt
to
the
barretters,
input
line
voltage
at
the
Mod
e l
416A
must
be
at
approximately
115
volts
(within
110-120
volts)
(or,
if
the
Model
416A
input
is
wired
for
a
230
-
volt
input,
within
220-240
volts).
If
oper
a
tion
from
a
source
that
deviates
from
115
volts
is
neces
-
sary,
the
bias
supply
(output
terminal
J4-BIAS
on
the
rear
of
the
Model
416A}
should
be
checked
to
m a ke
sure
that
bias
c
urrent
is
within
±10%
of
8.
7 5
rna.
Connections
between
the
Model
416A
and
the
barretters
are
ind
:
'.
cat
ed
in
Fig.
14
,
and
should
be
made
in
the
following
sequence
:
a.
Using
the
t
wo
Type
AC
-
16K
cables
(BNC
to
BNC)
supplied
with
the
Type
AC
-
60K
transformer
assembly,
c
onn
ec
t
the
output
from
each
barretter
mount
to
its
respective
t r a n s
former
input
on
t
he
transformer
assembly.
b.
Using
the
two
Type
AC
-
16K
cables
su
p p
lied
w
ith
the
Model
416A,
connect
the
output
from
each
transforn1er
to
its
respective
input
on
the
Mode
l
416A.
-26
-

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