Tektronix 570, Manual

Page: 131 / 134

9.
ADJUST
VERI'.
GAIN
AND
CHECK VERTICAL
MA/DIV
SWITCH
Switch the
VERTICAL
to
SCREEN
and the control to
0.1
Switch the
INDICATION
control to +DC and set the
+DC
V
AR
IA
BLE
control
exactly 140 v, with range DC volt
s-a
t
140.
Switch the meter to
HTR
and
position the spot to the bottom graticule line. Switch the mete�o
+DC
and adjust the
VERT GAIN ADJ
for a deflection of
10
divisions. Switch back
and forth between the � and !]Q positions until all interaction has been
compensated for.
Adjust the
+DC VARIABLE
control for
100
v
and switch the
INDICATION
control
t
o
HTR.
Switch the
VERTICAL
control to
50
and position the spot to
the bottome graticule line. Plug the special calibrator unit into the
+DC
jack and ground jack on the Test Panel. There should now be
2
divisionS-­
of deflection. Switch the
VERTICAL
oontrol to � for 5 divisions
of deflection, and then to
10
for 10 divisions of derlection. Check
all
positions of the
VERI'ICAL
MA
DIV
control using the special calibrator
unit.
The
accuracy must be within
10.
ADJUST VOLTS
/
DIV BAL.
Connect the f jack to the K jack on the test panel. Switch
HORIZONTAL
to
P
LA
T
E
.
Rotate the switch and adjust the
VOLTS
/
DIY
BAL
the
chassis
)
for no horizontal shifting of the spot.
11. SET V
O
L
T
S
/
STE
P
ZERO ADJ.
Switch the
HORIZONTAL
control to
GRID
and to�. Turn the
START
A
D
J
U
S
T
full
left Ground pin
8
of
V1l
5
.
Depress the
�
B
IA
S button
and place the spot under the center graticule line. Release the switch and
with the
VOLTS
/
STEP
Z8RO
ADJ.
return the spot to the center.
12.
CHECK
START ADJUST POSITION AN D RANGE.
With the
START ADJUST
in the full left
(
ccw
)
position, the first step should
be slightly to the left of the zero bias point. With the control in the
full right position, there should
be 6
or more steps to the right of the
zero
bias pOint. The index on the
START ADJUST
knob should point to th
e
Q
on the front panel when the first step is at the zero
bias pOint.
13. ADJUST
HORIZONTAL GAIN.
With the
+DC
control at
100,
s
w
i
t
c
h the
HORIZONTAL
control to
PLATE.
Switch
the
control
to 10
and the
SERIES LOAD
control to 1M.
A
lte rna t
e
ly
connect the P jack on the Test Panel between
GND
and
+DC.
Adjust
the HOR.
GAIN
for
10
divisions of deflection.
--- ---
14.
SET
THE VOLTS
/
STEP ADJ.
Switch the
HORIZONTAL
control to
�
and the control to�. Switch
the control to�. Set the
VOLTS
/
STEP ADJ.
for
1
step
per
graticule
division.
15. SET
VOLTS
/
DIV CAL
(R227).
Switch
HORIZONTAL VOLTS DIV
control to 1Q and the
control to 12.
Adjust
R227
on
HORIZONTAL
switch
)
for
1
step per graticule
division.
The horizontal gain and the setting of
R227
will interact; therefore, Steps 13,
1
4
and
15 must be rechecked until all interaction is mini�ized. Check
all po­
sitions of the
switch against the
sW1tch.
January,
1959
570-3