Advertisement
from the
line
.
The red indicator lamp
immediately above
the power switch
lights
when the switch
is in the
ON
position
.
INPUT
-
These two
termina
l
s
are Type BNC female connectors.
As indi
-
cate
d b
y
the
pan
el
markings
,
in a reflectometer
setup
the
output
from
the forward
dete
ct
or
is
connected
to the
INCIDENT
/REFER
ENCE
connector, and the
output
from
the
reverse
d
etector is connected
to
the
REFLECTED/PROBE connector.
In a slotted line (SWR) setup
,
the
output from the reference
probe
is connected
to the INCIDENT
/R
EFERENCE
connect
or
,
and
the output from
the slotted
line
probe
is connected
to the REFLECTED/PROBE
c
onnec
t
or
.
EXCESS
COUPLER LOSS
-
This
togg
l
e
switch
va
ries
the gain
in the
in
-
cident
channel.
OUTPUT
/J3
-
This Type BNC
connector
is
on
the
rear of the
Model 416A.
\o-c
voltage
,
proportional
to the rati
o of
the
input
vo
lta
ges
is supplied
to this
connector for use
in
dr
iving
an oscilloscope
or
rec
order
.
J4/BIAS
-
These
binding post
type terminals
,
which will
acc
ommodate
either
wire or a
standard
(3/4"
spacing) dual banana
plug
,
also are
on the rear
of
the
Model
416A.
With
a line voltage input
of 115
v
olts
,
approximately
17 ma.
de
is available at the J4 terminals for
bias
current
for barretter
detectors (8
.
5 ma.
f
or
each barretter).
CAUTION
:
When
using
barretters
,
the
Model 416A
input
line
voltage
must be within approximately
110
-
12
0
volts
(220
-
240
volts
when the primary winding of
transformer
T 1
is
arranged
for
a 230
-
volt
input)
.
If
operation from
a
source
that deviates
from 115 volts is
necessary
,
the barretter
bias supply (out
-
put from J4/BIAS)
should
be checked to
m
ake
sure that
bias
current
is
within rated limits for
the
barretter
bei
ng used.
FUSE
-
This
fuseholder
,
also
on
the rear
of
the inst
rument
,
contains the
2
-
ampere
cartridge fuse
in
the power
supply
input circ
u
iL
To
replace
the fuse,
turn the
fuseholder
cap
,
remove the
old fuse
,
insert a
new fuse
of
the
same type
,
and
replace the
fuseholder
cap
.
Replacement fuses
must
be of
the
1
1
Slo
-
Blo"
type
as
specified
in
the
Table of
Replaceable
Parts
.
Ope
rating
Procedure
-=
General
-
The
Model 416A Ratio
Me
ter
may
be used
to
measure
the ratio
of
any two
1
kc
voltages.
It
is
particularly adapted
for
use
in a reflectometer
system to measure the
ratio
of
reflected
power to
incide
nt
power,
or
i
n
a
slotted
line system
to
measure
the standing wave ratio.
Detailed
instructions
co
v
ering
the use
of the
Model
416A in
a
reflectometer
or
slotted line
system are
given
in
the
Applications
section
.
General
o verall operating
instructions are
given
in the
following paragraph.
Procedure
-
1.
For
completing
connections
between
eac
h
v
oltage source (usually a
square
-
l
aw
detector
)
and
the
inputs
to
the
Mode
l
416A
,
two
Type AC
-
16K
cables
are furnished
with the Model 416A.
With one
cable
,
connect
the
output from the
-
4
-
_,
(/)
(1)
'-I
. . . . .
.
Pl
......
Advertisement
