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HP 416A - Page 24

HP 416A
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0
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"O
c
crj
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['-
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.
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ll,)
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...........
'
0
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.
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0
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4.
Connect
a
Model
X421A
Wavegu
ide
Crystal
Detector
Mount
to
the
sec
-
ondary
arm
of
each
coupler.
5.
Connect
the
Model
X281A
adapter
to
the
R . F .
OUTPUT
on
the
Model
670
HM
oscillator.
A
Type
AC
=
l6Q
cable
is
suitable
for
this
con-
nection.
This
cable
is
not
supplied
,
and
may
be
procured
from
the
Hewlett
-
Packard
Company
.
Model
416A
Ratio
Meter
-
Next
the
Model
416A
is
set
up
for
operation.
3
1.
Plug
the
power
cable
into
a
power
line
of
specified
voltage
and
fre-
quency
.
Turn
the
power
switch
to
ON
.
Allow
the
instrument
about
five
minutes
to
reach
a
state
of
stable
operation.
2.
With
the
two
BNC
-to-
BNC
cables
furnished
with
the
Model
416A
,
con-
nect
the
detectors
to
the
Model
416A
inputs,
a ,
Connect
the
incident
detector
to
the
INCIDENT
/REFERENCE
input.
b.
Connect
the
reflected
(reverse)
detector
to
the
REFLECTED/
PROBE
input.
3 .
Check
the
position
of
the
EXCESS
COUPLER
LOSS
switch.
When
a
20
-
db
(Model
X752D)
coupler
is
used
to
sample
the
incident
power
,
the
switch
should
be
set
at
10
DB
,
(At
the
10
DB
setting
of
the
switch,
an
additional
10
db
of
gain
is
inserted
in
the
incident
channel.)
If
a
10-db
(Model
X752C)
coupler
is
used
to
sample
the
incident
power
,
set
the
EXCESS
COUPLER
LOSS
switch
at
0
DB,
4.
Connect
the
OUTPUT
/J3
connector
(Type
BNC)
on
the
rear
of
the
Model
416A
to
the
vertical
input
of
a
d
~·
c
oscilloscope
.
5 .
Check
that
the
modulation
frequency
on
and
level
3
of
the
input
signal
voltage
is
within
operat
ing
limits
. I
nd
icati
on
that
the
in
put
signal
i's
within
frequency
and
volta
ge
limits
is
given
by
the
RF
POWER
MONITOR
(tuning
eye)
.
Input
filters
in
the
Model
4 l
6A
are
sharply
tun
ed
to
1,
000
cycles
.
Therefore
,
regardless
of
in
put
signal
level
,
no
voltage
will
reach
the
tun
i
ng
eye
circuit
unl
ess
t
he
signal
is
within
±
40
cycles
of
1,
000
cycles
.
However
,
when
the
input
voltage
is
of
correct
frequency,
an
input
signal
of
even
minimum
level
will
cause
the
eye
to
give
a
definite
indication
:
the
shutter
will
move
toward
closure
.
As
the
voltage
of
an
input
signal
of
proper
frequency
app
ro
aches
the
maximum
level
,
the
eye
closes
completely
,
If
the
eye
o
verla
ps
by
more
than
1
/32
11
,
indication
is
given
that
the
frequency
of
t
he
voltage
is
correct
but
that
the
lev
el
is
too
h i
gh
.
The
reflectometer
system
should
be
operated
at
the
lowest
practical
input
power.
When
the
input
to
the
crystal
detector
is
within
the
-
50
dbm
to
-
10
dbm
range,
the
detector
is
operating
largely
within
its
linear
region
(Fig.
8 -
1),
and
output
characteristics
of
the
two
crystal
detectors
will
come
close
to
tracking
.
A
brief
discussion
of
crystal
detector
characteristics
is
given
under
Possible
Error
If
Input
Power
to
Dete
ct
or
Too
High
,
below
.
-14-

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