Advertisement
"""
L!)
-
r -
-
-
N
-
There now sho uld
be
a
connection
(
1)
from the incident
directional
coupler
(Model
S752D),
through
a barretter
and its t
r
ansfo
r
mer
,
to
the INCIDENT/REFERENCE
input
on
the
Model 4 l
6A,
and
(2
) from
the
reflected
di rectiona
l c
o up
ler (Model
S7
5
2C},
through
a
barrette
r
and its
transforme
r,
to the
REFLECTED
/PROBE input on the
.
Model
416A.
CAUTION
:
Do
not
co
nne
ct· t
he b
ia
s
supply
to the .transforme
r assembly
a
t
this
time.
The bias
supply
connection
never should be
completed u
nti
l
the Model 416A
has been through a warm
-
up
period
of
app
r
o
x imately
five minutes.
6.
Connect
the
Mod
el
S28lA
adapter
to
the R.
F
.
OUTPUT on the Model
670SM os
cillator
•. A
Type
AC
-
16Q
c
able is
suitab
le
for thi
s
connection.
This
cable
is
not
supplied
~
and
may be
procured from
the
Hewlett-
Pac
kard Company.
Model 416A Ratio
Mete
r
-
-
1.
Plug
the
power
cable
i
nto a
power
line
of specified voltage
and
fre-
quency.
Turn
the
powe
r
s
w
i
tch
to
ON.
Allow
the
instrument about
five
minutes
to
re
a
ch
a
state
o
f
stable
operation.
2
.
With the
Type·AC
-
16A
c
able
(dual
banana plug to
dual
banana
p
l
ug
)
sup
-
plied with th
e
Type
AC
-
60K
transformer
assembly,
c onnec
t the bias
current for
the
ba rrette
r
s
to
the
irnpedance
-
matc
hing
transformers.
The b ias
supply
output
te
rmi
nals
( J4-BIAS}
are on the
rear
of
the
Model
4
16A; the
i nput
terminals (BIAS)
are
on
the
top of
the
trans
-
forme
r
ass
embly.
3.
Check
the position of
t
h
e
EXCESS
COUPLER LOSS
switch.
When
a
20 =db
(Model S752D)
c
oupler
is
u
s
ed to
s
ample
the
incident power
,
the
switch should be set at 1
0
DB
.
If
a 10-db (Model
S752C)
coupler
is
used
to
sample
the
incid
e
nt
power,
s
et t
he EXCESS
CO
UPLER
LOS
S
switc
h a
t
0
DB.
4.
Conne
c
t
the
OUTPUT/
J
3
c
onnector
{Type
BNC)
on
the
rear
of
the
Model
4
16A
to t
h
e
vertical
i
nput
of the
oscillos
c
ope.
5.
Che
c
k that
the
frequency and
level
8
of the input
signal
voltage
is
within
operatin
g
limit
s.
I ndi
c
ation
t
hat
the
input
signal
is
within
freque
n
cy
and
vo ltag
e limits
is given
by
the
RF POWER
MONI
TOR (tuning
eye).
Input filte
rs
in
the
Mo
d
e
l
416A a
re sharply
t
u
ned
to 1,
000
cycles.
Therefore
,
regar
d
les
s
of input
sig
n
al
l
evel,
n
o
voltage
will re
ach
the
tuning
eye
circuit
unless
the
s
ignal
is
within ±4
0
cycles
of
1
,
000 cycle
s.
Howe
v
er, when
the input
voltage is of
correc
t frequency, ah input signa
l
8
The reflectome
ter
sys
te
m sho uld
b
e
operated
at the
lowest practical input
power.
When
the input to
t
he
crystal
detecto
r
is
within
the
-5
0
dbn~
to
-1
0
dbm
range~,
the
detector is
o perating
largely within
it
s
linear
region (Fig.
8
},
and
output
c haracteristics of the
two
crystal
d
etector
s
will
come
close
to tracking
.
A br
i
ef dis cuss
i
on
of
cry
sta
l
d,etector
c
ha
r
acte
r
istics is given under
Possib
le
Error
if
I
nput
Power
to
Detector.
T
oo
High, below.
-
27
-
Advertisement
