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HP 416A - Page 35

HP 416A
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By
means
of
the
SET
TO
FULL
SCALE
adjustment,
sufficient
gain
is
in
-
serted
in
the
reflected
channel
to
compensate
for
a
small
power
loss
in
the
transmission
system,
and
differences
between
the
rectification
ef
-
ficiencies
of
the
two
detectors,
up
to
6
db,
are
equalized.
Adjusting
SET
TO
FULL
SCALE
on
t
he
basis
of
the
information
made
available
when
a
sliding
short
is
used
permits
the
Model
416A
gain
to
be
set
at
such
poin
t
that
the
error
signal
is
not
enhanced.
Since
the
error
signal
is
proportional
to
the
reflection
coefficient
of
the
load
being
measured,
whe
n
the
error
is
compensated
for
at
100%,
it
is
compensated
for
at
other
reflection
coefficient
values
(at
the
same
fre-
quency)
.
7.
Disconnect
the
Model
X920A
Adjustable
Short,
and
a.
If
a
slide
screw
tuner
has
been
adjusted
to
compensate
for
th
e
directivity
error
signal,
connect
to
the
slide
screw
tuner
the
load
to
be
measu
red,
being
careful
not
to
disturb
the
adjustment
of
the
tuner.
b ..
If
a
slide
screw
tuner
has
not
been
used,
connect
the
load
to
be
measured
to
the
output
of
the
reflected
directional
coupler.
NOTE
:
When
operating
in
the
S
band,
use
a
Model
S920A
Adjustable
Short.
Adjustment
of
Slide
Screw
Tuner
When
a
slide
screw
tuner
is
to
be
used
to
compensate
for
the
directivity
error
signal
,
the
tuner
m
ay
be
adjusted
before
or
after
the
system
is
calibrated
.
Full
step
-
by
-st
ep
procedure
inv
olved
in
the
calibration
procedures
are
described
above
.
At
the
time
t
he
tuner
is
to
be
adju
ste
d,
the
Model
670H
{or
HM)
oscillator
has
been
set
for
a
specific
frequency
and
its
SELECTOR
switch
is
at
MANUAL.
L
On
the
Model
4
16
A,
set
the
RANGE
switch
at
-30
DB
3%.
2.
Disconnec
t
the
load
from
the
output
of
the
reflected
d
ir
ectional
coupler,
and
in
its
place
connect
a
slide
screw
tuner
the
reflection
from
which
is
adjustable
as
to
amplitu
de
and
phase,
such
as
Hewlett-
Packard
Model
X870A
Waveguide
Slide
Screw
Tuner,
and
a
movable
low
-re
fle
ction
load,
such
as
a
Model
X914A
Waveguide
Moving
Load
.
This
termination
arrangement
is
shown
in
Fig
.
13-1.
3 .
On
the
Model
670H
(or
HM
).
adjust
the
ATTENUATION
control
while
watching
the
tuning
eye
on
the
Model
416A
.
The
ATTENUATION
control
should
be
adjuste
d
to
obtain
an
approximately
1/8"
gap
in
the
tuning
eye
shutter.
4 .
There
are
now,
essentially,
three
signals
present
in
the
system:
( 1)
the
reflection
from
the
load
,
which
is
the
desired
signal;
(2) a
signal
which
results
from
imperfect
directivity
in
the
reverse
cou-
pler
;
and
(3)
the
reflection
from
the
slide
screw
tuner
.
-23-

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