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HP 416A - Page 59

HP 416A
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CAUTIO
N:
Ca
e should be
ta
ken
that
th
e co
rrect
mod
u
..
l
ati
on
fr
eque
n
cy
( 1 k c}
is
c
ho
sen
and
not
some
subh
arm
o _
ic
of 1,
000
cy
cl.
o;
s .
b.
If
the
tun
i
ng
eye
do
es
no
t
move,
wh
i
ch
ind
ic
at
es
that
the
level
of
the
signal
is
too
lo
w:
( 1)
Increa
s e
the
level
of
the
signal
a t
th
e
source;
or
(2)
Set
the
EXCESS
COUPLER
LOSS
switch
at
10
DB,
thereby
inserting
an
additional
10
db
of
gain
in th e
referenc
e
channel.
NOTE:
After
setting
the
EXCESS
C
OU
P
LER
LOSS
switch
at
l 0
DB,
it
may
be n
ece
ssary
to
de
-
c r e
ase
th
e
level
of
the
signal
at
the
sou
rc
e
to
bring
the
signal
w i
thin
operating
limits
of
the
Mod
el
4 l
6A.
c.
If
the
tuning
eye
ov
erl
aps
by
more
than
1/32
11
,
which
ind
i
cates
that
the
level
of
the
s
ignal
is
to
o
high:
( 1)
Insert
additiona
l
atten
uati
on
in
the
line
by
using
a
dir
e c -
tiona
l
coupler
whic::h o
ffers
greater
at
tenuation
to
the
referenc
e
voltage;
or
(2)
Reduce
the
level
of t
he
s
ig
na
l
at
th
e
sou
rce.
5,
Connect
the
outpu
t
of
th
e s l
ot
ted-li
ne
prob
e
det
ec
tor
to
the
R
E-
FLECTED
/PROB
E
input
on
th
e
Model
416A.
6.
Move
the
slott
ed-li
ne
probe
along
th e
li
ne
unti
l th e
maximum
voltage
point
is
reac
hed
.
Indic
a t i
on on
the
Mo
del
416A
meter
will
be
in
the
d
irec
tion
of
11
l11
on
the
uppe
r S
WR
sca
le
.
7.
Loosen
the
prob
e l
ocking
mec
h a n
is
m a n d
adjust
the
depth
of
probe
penetration
to
obta
in
on
th
e r
atio
meter
upp
er
SWR
scal
e
an
indi-
cation
which
is
a s
close
to
11
l
11
as
possible.
With
the
prob
e
in
this
position
,
th
e a
mplitu
c-.e of
th
e
vo
l
tage
o
ut
p
ut
of
the
probe
de
-
tector
i
~
:;
approxi
m
at
ely
th
-:::
same
a s
th
at
of the
ref
ere
nc
e
voltage.
Lock
the
prob
e
in
th
i s
pos
iti
on .
8.
If
the
rati
o
me
ter
i
nd
ication
is
n
ot
exactly
on
" l
",
adj
us
t
th
e
Model
416
A
SET
TO
FUL
.L
SC
ALE
co
n
tr
ol to
obt
a in a n i
nd
ic
ation
of
exactly
11
1
11
•
In
the
Nlod
e l
",1:16A
m e
asu
rern
e
nt
circu
it,
the
am-
plitude
of
t
he
referenc
e
voltag
e
and
t
he
amp
lit
u
ci.e
of
th
e
standing-
wave
max
{
prob
e
,.
voltage
no
w-
are
equ
a::..
9.
Now
move
the
s l
otte
d-li
ne
p1
·obe
al
on
g
th
e
li
ne
un
til
the
n11n1mum
voltage
point
is
reache
d.
Th
e
point
oi h
ig
he s t S WR
indicati
on on
the
ratio
meter
i s
th
e
po
in t
of
st
a
nding-w
a.-,
re
minirn
um
v
oltag
e .
=#
>~
,_
O'
~
c
c
er

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