Tektronix 570, Manual

Page: 130 / 134

Check regulation of all supplies
10Sv
and
125v
ac line.
3.
ADJUST THE
HIGH-VOLTAGE SUPPLY.
Set the
-1100
ADJ.
for
-170Ov
at the crt filament
leads.
Check hv regulation
at
maxi
mum
intensity.
4.
CHECK RANGE DC VOLTS OF VOLTMETER
AGAINST STANDARD
METER AND +DC
SUPPLY.
With an
a
cc
ur
a te
volt
meter on the +DC jack
on
the Test Panel, compare the
readings on the front panel meter against the test meter. The me ter accuracy
should be
within
±2%
on
all
ranges
and
should be checked as
follows:
RANGE
DC VOLTS
INDICATION
Check at
300v
Check
at
30Ov,
200v
and 100v
Set meter
to
indicate
10v
Check for 1Ov, set meter to indicate
35v
Check for
35v,
set meter to indicate
14v
Check for
14v,
set meter to indicate
1v
Check for 7v
5.
CHECK
THE
OPERATION O
F
'!HE -DC CONTROL"
Vary the -DC control through its range for an indication from 0 to -lOOv on
the panelliieter and at the -DC
jack.
6.
CHECK
(GRID
A, GR
I
D
B
AND
-150
27K)
OUTPUT
JACKS FOR
PROPER
VOLTAGES.
With the
TEST POSITION
switch at GRID A or OFF, the GRID B jack on the Test
Panel should be biased about When t
�
TEST POSITION switch is at
GRID B
or OFF, the
GRID
A jack should read
approximately
-
1
2
5
v.
The
-150 27K
jack
shoul
d:r
ead
� using
a
meter
a
300
v
range you
should read-125
v.
A
meter with
a
250
v ra
n
ge you should read 110 volts.
Turn the
TEST PCMER
switch on. Advance the INTENSITY control and position
the spot to the
central
area of the
graticule.
Check the FOCUS and ASTIGMATISft
controls for proper operation. Obtain
a
horizontal t r a ce by switching
HORIZONTAL
to
!l,
o
r for sufficient hori
z
on
t
a
l trace
to
align with
the graticule. Push crt against graticule and align trace with the horizontal
graticule lines. Tighten crt clamp.
7.
ADJUST
PHASE A AND Be
Obtain a vertical bar pattern by switching the
HORIZONTAL
control to
GRID,
patch the
P
jack
to
one
of the
ground
jacks
on
the Test Panel. Adjust the
STEPS
FAMILY
control f o
r
6
to
10
steps� With the control at the
]1Q
ccw posi tion,
adjust
the PHASE ADJ A control for optimum flatness at
the bottom of the display. With the control at the
19Q
(cw)
po­
sition, adjust the
PHASE
ADJ B control for optimum flatness at the top of
the display. Check the
240
position for alternate switching.
8.
SET
CRT GECH. ADJ.
Wi th the same display
as
in
Step 7,
adjust GEOM
ADJ
for minimum curvature
of the vertical traces.
(1
minor division of bow allowed per
6
major divi­
sions.
)
January,
1959
570-2