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3.
Connect the unknown load to
the output
of the reflected
coupler
(Model
S752C).
·
4.
Co
nnect a Model S485A
Waveguide
Detector Mount to the s
ec onda
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
whic
h 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 o
b taine
d {ro1n
the Hewlett-Packard
Company.
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
:rcmt to
the
barretters, input line voltage at the
Mode
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
k
e
sure that bias
c
urrent
is
within ±10%
of 8.
7 5
rna.
Connections between the Model 416A and the barretters are
ind:' .
cated
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
onnec
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
sup
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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