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HP 416A - Operating Procedure

HP 416A
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The use of a Mod
el
416A
in
a
sl
ott
ed
-
li
ne
system
as
an
SWR ind
ica
tor
offers
a n
advantag
e in a
ccurac
y.
By
sampling
the
output
from
the
signa
l
source,
and
us
i
ng
t
he
vo
ltag
e d
er
i
ved
th
erefro
m
as
a
refere
nce
voltage,
the
Model
416A
eliminates
err
o r s wh
ic
h
wit
h a
no
ther
typ
e
of
indica
tor
would
arise
when
signal
source
amp
li
tude
va
:r
i
at
i
ons
o
cc
ur
du
r i
ng
measurement
•
.
Q
.f~
rating
Procedu
re
-
1.
Put
the
s
ig
na
l
sou
rce
into
op
erat
i
on
in
accordance
with
the
pro
c e -
dures
given
in
the
instruct
i
on
book
for
the
type
of
signa
l
source
being
used
.
Set
the
i
nst
rume
nt
to
d
eliver
a
signal
of
the
desired
frequency
,
and
arrange
t
hat
th e
signa
l
to
be
delivered
to
the
slotted-
li
ne
system
is
modulated
by
a 1 - kc
square-wave
voltage.
2.
Assemble
the
slotted-lin
e
syst
em
(Fi
g.
16
):
a .
Connect
th
e
outp
u t e
nd
of
the
d
irec
tional
coupler
to
the
slotted
·-
line
.
section
(
equipped
with
p
ro
be
and
detector).
b.
Connect
a
squa
re-l
aw
de t
ect
o r
to
the
s e
condary
arm
of
the
coupler
.
c.
Connect
a
waveguide
-t
o
-coaxial
adapter
to
th
e
input
end
of
the
dire
cti
onal
couple
r.
d.
Connect
th
e
adapter
to
the
s
ignal
sou
rc
e.
(A
Hewlett
-
Packard
Type
AC-16Q
c
oaxia
l
ca
ble
is
su
it
able
for
this
connection.)
e.
Connect
the
unknown
load
to
the
output
end
of
the
slotted-line
section.
3.
On
the
Model
416A
Ra
ti
o
Mete
r:
a.
Plug
the
pow
er
cable
into
a p
owe
r
li
ne
of
specified
voltage
and
frequency.
Tu
r n
the
power
switch
to
ON
.
Allow
t
he
instru-
ment
about
five
min
utes
to
r
each
a
state
of
stable
operation.
b.
With
the
two
BNC-to
-
BNC
cable
s
furni
sh
ed
with
the
Model
416A,
make
the
fo
llow
ing
co
nn
ec
t
io
ns
:
(1)
With
one
c
ab
le,
connect
t o
the
Model
416A
INCIDENT
I
REFERENCE
in
put
th
e
output
of
the
d
et
ector
on
the
seconda
ry
arm
of
th
e
di
rec
t
io
na
l
co
u
pler.
(2)
Connect
the
ot
he
r
cable
to
the
output
of
the
slotted-line
probe
detector.
Thi
s
ca
b
le
will
be
used
later
to
connect
the
probe
to
the
Model
416A
REFL
ECTED/PROBE
input,
but
this
connection
is
not
to
b e
made
at
this
time.
c.
Check
that
the
EXCESS
COUPLER
LOSS
switch
is
at
the
0
DB
position
.
-
41
-
..

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