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HP 416A - Page 8

HP 416A
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from
the
line
.
The
red
in
dicator
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
IN
CIDENT
/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
le
switch
va
ries
the
gain
in
the
in
-
ci
dent
channel.
OUTPUT
/J3
-
This
Type
BNC
connect
or
is
on
the
rear
of
the
Model
416A.
\o-c
voltage
,
proportional
to
the
rati
o
of
the
in
put
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
curre
nt
for
barretter
detectors
(8
. 5
ma.
f
or
each
barretter).
CAUTION
:
When
using
barretters
,
the
Model
416A
in
put
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
in
put)
.
If
operation
from
a
source
that
deviates
from
115
volts
is
necessary
,
the
barretter
bias
supply
(out
-
put
from
J4/BIAS)
shou
ld
be
checked
to
m
ake
sure
that
bias
current
is
within
rated
limits
for
the
barretter
be
i
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
,
an
d
replace
the
fuseholder
ca
p .
Replacement
fuses
must
be
of
the
11
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
po
wer,
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
vera
ll
operating
inst
ructions
are
given
in
the
following
paragraph.
Procedure
-
1.
For
complet
ing
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
......

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