Tektronix 570, Manual

Page: 133 / 134

19. CHECK
VALUE
OF
SERIES
LOAD
RESISTORS
With the
HO
RIZ
O
NT AL control at PLATE, measure resistance between pin
3
of
V3l5
and the P connector on the Test Panel.
Check
all
positions of the
SERIES
�
switch for
ie
sistance as follows:
(±5%)
SERIES LOAD
switch
300
lK
2K
5K
All
others
Resistance
o
150
1150
4150
Same as panel indication.
20. ADJUST PLATE
SWEEP
(C3ll)
AND PLATE TRANS.
(C3l5)
BALAN
CE CAPACITORS.
Swi tch Meter
10
Heater Indication.
Switch the
VERTICAL
control to
.02
and PLATE. Switch PEAK
VOLTS
to
and
SERIES LOAD
to 1M. Connect the
ungrounded
side of
C3l5
to either
terminal
5
or
1
of
T3l0.
C3l6
(
terminal
5
to ground
)
may have to be moved
to terminal
1
or removed in order to get minimum deflection. Both
C3l5
and
C3ll
are adjusted for a minimum trace width.
21.
ADJUST GRID (C502)
AND
SCREEN (C509) BALANCE CAPACITORS.
Switch the
VERTICAL
control to
GRID.
C502
can be conneoted to either
te
rm
in
a
l 14
or 16 of
T50l. Adj�C502
for a minimum trace
width.
Switch
the VERTICAL
control to
SCREEN. C509
can be connected to either terminal
1
or
9
of
T50l.
Adjust
C509
for
a
minimum trace width. Recheck the setting
of
C502
since there
will
be a slight interaction between
C502
and
C509.
22.
P
LAC
E
A 6U8 IN POSITION, ADJUST
C205 AND CHECK
ZERO BIAS AND
SINGLE FAMILY
SwrlCBES
Switch TEST POWER to OFF. Insert a
6U8
in the test socket and make all
necessar,r connections from the pin jacks to the Test Panel. Set up the
GRID-STEP GENERATOR
and the
CRT DISPLAY
for the typical operating conditions
of the tube under test. Switch the
TEST POWER
ON
and adjust the
O
P
E
R
A
T
IN
G
VOLTAGES
and the
PLATE SWEEP GENERATOR.
Switch
TEST POSITION
switch to
GRID A
or
�
and observe a display of curves.
Tum
the control
to
lQ
or
2Q
and adjust
C205
for optimum retrace. Check the operation of
the
SINGLE FAMILY
control with the
control turned full right
(
c
w
)
•
23. CHECK ALL ACCESSORIES. (ON
Q.C.)
24. RECORD CRT T
Y P
E
AND SERIAL
NUMB
ER ON
THE
CALIBRATION RECORD.
MS¥,
1959
510-5