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HP 416A - Page 71

HP 416A
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10
, D
isc
o
nnect
the
voltmeter
fr
om
capacit
r C 27a
an
d
co
nn
e c t
th
e
meter
to
the
input
side
of
capacitor
C4
l ,
located
on
the
bottom
d
ec
k
of
the
Model
416A.
The
input
side
of
C41
i s
connected
to
terminal
strip
TS2
,
also
identified
in
Fig
.
21.
Note
the
voltmeter
indication
and
record
it
as
Voltage
B
(this
resultant
voltage
corresponds
to
Voltage
B
as
shown
in
F
ig
s.
3
and
5).
A
typical
Voltage
B
reading
might
be
172
millivolts.
11
.
The
Voltage
A
reading
(obtained
in
step
9)
and
the
Voltage
B
read-
ing
(obtained
in
step
10)
each
should
be
within
5%
of
the
average
of
their
values
( .
05
x
Voltage
A +
Voltage
B).
2
12
.
Disconnect
the
voltmeter
from
capacitor
C41
.
13
.
With
the
incoming
resultant
voltages
within
the
limits
specified
in
step
9,
adjust
variable
resistor
R96
to
obtain
an
indicati
on
of
100
(full
-
scale)
on
the
PERCENT
REFLECTION
(REFLECTOMETER)
scale.
The
R96
adjustment
is
located
on
the
top
deck
of
the
Model
416A
,
and
is
identified
in
Fig.
20
.
14
.
Adjust
the
SET
TO
FULL
SCALE
control
to
obtain
an
indication
of
90
on
the
PERCENT
REFLECTION
(REFLECTOMETER)
scale
.
15
.
Vary
the
power
input
to
the
Model
416A
by
reset
ti
ng
the
variable
transformer
for
a
103
.
5V
AC
input
and
then
a
126.
5V
AC
input.
The
meter
indication
should
stay
on
90
.
16
.
Readjust
the
SET
TO
FULL
SCALE
control
to
obtain
an
indication
of
100
on
the
PERCENT
REFLECTION
(REFLECTOMETER)
scale
.
Tun
ing
Eye
(V9)
Adjustment
- -
1.
Unless
it
is
known
that
the
instrument
is
adjusted
and
functioning
properly
,
the
Electrical
Zero
an
d
Electrical.
Full
Scale
Ad
justments
should
be
performed
befo
re
the
t
un
i n g
eye
(RF
POWER
MONITOR)
is
adjusted
.
At
the
start
of
the
tuning
eye
adjustment,
therefore
9
test
equipment
will
.
be
con-
nected
as
shown
in
F
ig.
18,
an
d c
ontrols
will
h
av
e
the
settings
obtained
as
a
result
of
the
calibration
a
djus
t
ments
.
The
signal
source
is
del
i
vering
10
volts
at
1
kc
to
attenuator
# 1.
Attenuator
# 1
is
set
at
-
40
db
and
attenuator
#2
is
set
at
0
db
.
The
varia
ble
transformer
is
set
so
that
line
voltage
to
the
Model
416A
is
115V
AC
.
2.
With
the
input
to
the
i
ncide
nt
an
d
reflected
channels
as
set
up
by
the
calibration
proc
edure,
adjust
va
r
ia
ble
resistor
R60
so
that
the
tuning
eye
closes
and
overlaps
approx
i
mately
1/32
in.
If
it
is
known
that
the
Model
416A
is
functioning
correctly
,
the
tuning
eye
may
be
adjusted
by
applying
100
millivolts
at
1
kc
to
each
channel,
(at
the
INCIDENT
/REFERENCE
connector
and
the
REFLECTED/PROBE
connector),
and
adjusting
R60
so
that
the
tuning
eye
closes
and
overlaps
approximately
1/32
in
.
This
procedure
for
adjusting
the
tuning
eye
is
not
recommended
.
-5
4 -

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