Recalibration
—
Type
575
The
accuracy
of
the
entire
instrument
is
no
better
than
the
accuracy
with
which
this
adjustment
is
made.
Check
voltage
at
—
150
V
TEST
PT
for
—
150
volts
±3%.
Use
an
oscil
loscope
to
check
for ripple
on
this
supply
as
the
line
voltage
is
changed
through
the
range from
105-125
volts.
Normal
ripple
is
10
millivolts,
peak-to-peak.
b.
In
the
same manner,
check
regulation and ripple of
the
-f-100-volt and
+300-volt supplies.
The
output
voltage
of
both
supplies
should
be
within
3% of
the
nominal
value.
The
ripple
on
the
+
100-volt
supply
is
normally
10
millivolts,
peak-to-peak. The ripple
on
the
+300-volt
supply
is normally
25
millivolts,
peak-to-peak.
c.
Set
the
output
of
the
high-voltage
supply
to
—
1700
volts
with
the
—
1700
ADJ
control.
The
control and
jack
are
lo
cated
on
the
left
side
of
the lower deck. Defocus
the
ert
beam
and
turn
the
INTENSITY
control
fully
clockwise.
Change
the
power
line
voltage
from 105
volts
to
125
volts
and
check
the
—
1700-volt
supply
for
constant
output voltage. Then
turn
the
INTENSITY
control
fully
ccw
and again
check
for
constant
output
voltage
as
the
line
voltage
is
changed
from
105
to
125
volts.
Now reset
the
line
voltage
to
the
design
center
voltage
(117
v).
5.
DC
Balance
When
the
DC
BAL
control
is
properly
set,
the
trace
on
the
ert
will
not
shift appreciably
as
the
corresponding
Vertical or
Horizontal
control
is
moved
through
the
BASE
VOLTS
range.
(AMPLIFIER
CALIBRATION
in
ZERO
CHECK
position.)
a.
Horizontal
Amplifier
Set
controls as
follows:
BASE
STEP
GENERATOR
OFF
Horizontal
.5
BASE
VOLTS
INTENSITY
Usable
level
Hold
the
AMPLIFIER CALIBRATION
switch
in
the ZERO
CHECK
position
as
you
make
the
following
adjustments.
Move
the
spot
to
the center
of
the graticule
with the
two
positioning
controls.
Switch
the
Horizontal control
to
.01
BASE
VOLTS
and
move
the
spot
back
to
the
center
of
the
graticule
with
the
DC
BAL
control.
If
the
spot
cannot
be
moved
to
the center,
it
will
be
necessary
to
match
the
in
put
tube
(V344,
V354)
by
trial
and
error.
Normally,
the
spot
can
be
positioned off
either
side
of
the
CRT
screen
with
the
DC
BAL
control.
Readjust
the
DC
BAL
control until
the
spot
does
not
shift
appreciably
as
the Horizontal control is
moved
between
.5
and
.01
BASE VOLTS.
b.
Vertical
Amplifier
The
procedure
for
adjusting
the
vertical
DC
BAL
control
is
the
same
as
that
used
for
adjusting
the
horizontal
DC BAL
control.
6.
Differential
Balance
When
the
differential
balance
control
is
properly
adjusted,
equal
signals
applied
to both
grids
will
not
appear
between
the
plates
of
the input
tubes and
therefore
will
not
be
ampli
fied
by
succeeding
stages.
Set
controls
as
follows:
Vertical
EXT.
Horizontal
EXT.
PEAK
VOLTS
RANGE
0-20
PEAK
VOLTS
5
Transistor
Selector
Switch
TRANSISTOR
A
Connect
all four external
inputs
together
(rear
panel).
On
instruments
above
S/N
3659 pins E,
F,
H,
and
J,
of
the
Type
175
adapter
socket
must
be
tied
together
for
this
adjustment.
Run
a wire
from
the
external inputs
to
the
binding
post
marked
“
C"
on
the
left side
of
the test panel. Position
the
trace
on
the
central
area
of
the
graticule.
On instruments
below
serial
number
2765
the
DIFF BAL controls
are
the
miniature
potentiometers
mounted
on
ceramic terminal
strips
below
the
Vertical
and
Horizontal
selector
switches.
Instru
ments
above
serial
number
2764
have
the DIFF BAL
controls
mounted
on
a
small
bracket
just
behind
the
front
panel
on
the
right
side
of
the
instrument.
Adjust
the
DIFF
BAL
con
trols
so
that
only
a spot
remains
on
the face
of
the
CRT.
Slowly
turn
the PEAK
VOLTS
control
from
5
to
0
and
watch
the
spot.
If
it
changes
into
a
line
which
is
longer
than
four
spot
diameters
as
you
rotate
the
PEAK
VOLTS
control,
it
will
be
necessary
to
select
input
tubes which
have
more
similar
characteristics.
When
you
change
input
tubes,
re
peat
the DC
BAL
procedure
before
attempting
to adjust
the
differential balance.
After
a
satisfactory
differential
balance
has
been
attains
Remove
your
test
leads.
7.
CRT
Alignment
Set
controls
as
follows:
PEAK
VOLTS
RANGE
Vertical
Horizontal
Adjust
the
PEAK
VOL1
trols
for
a
horizontal
trace
of
about
10 major
divisions.
Center
the
trace
with the
Vertical
POSITION
control.
The
trace
and
the
graticule
line
should
coincide.
CRT
Adjustment
S/N
101-1620
If
the trace and graticule
line
do
not
coincide
over
the
length
of
the
graticule,
loosen
the
ert
base
clamp
and
rotate
the
tube
with
the
alignment
ring.
When
the
trace
and
the
graticule
line
are
in
coincidence,
push
the tube
forward
so
that
it
rests
snugly
against
the graticule. Then tighten the
ert
base
clamp.
Recheck
the
alignment
after
tightening
the
clamp
to
be
sure
it
didn't
move
while
the
clamp
was being
tightened.
CRT
Adjustment
S/N
1620-up
Loosen
the
clamp
at
the
base
of
the
ert
and push
the
ert
against
the
graticule,
then tighten
the
clamp.
Now
with
the
red
knob, near
the
bottom
of
the
clamp,
rotate
the
ert
until
the
trace
runs
parallel
to
the
horizontal lines of
the
graticule.
8. Vertical
Gain
The
controls
to
be
adjusted
in
this
step
set
the
gain
of
the
Vertical
Amplifier to a value which
results in a trace de
I,
repeat
the DC
BAL
procedure.
0-20
1
COLLECTOR MA
.5
COLLECTOR
VOLTS
and
Horizontal
POSITION
con-
5-2
Summary of Contents for 175
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