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Tektronix 502A

Tektronix 502A
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Calibration
Procedure
—
Type
502A
29.
FEEDBACK
BAL
Set
the
TIME/CM
switch
of
the
Type
502A
to
2
mSEC;
the
Input
Selector
to
B-DC
and
the
SENSITIVITY
switch
to
.2
mVOLTS
PER
CM.
From
the
Type
105
apply
3
cm
of
200
cycle
square
waves
to
the
oscilloscope.
Refer
to
figure
5-11
for
the
proper
placing
of
attenuators
and
the
capacitance
standardizer.
Adjust
for
a
stable
display.
While
observing
the
display
adjust
the
FEEDBACK
BAL
Control
for
an
optimum
square
wave.
Now
apply
the
signal
to
the
A
input
connector
and
change
the
Input
Selector
switch
to
A-DC.
Check
for
a
good
square
wave.
The
final
setting
of
the
FEEDBACK
BAL
Control
should
be
made
for
an
optimum
square
wave
with
the
input
applied
to
either
input
channel.
Disconnect
the
Type
105
from
the
Type
502A.
30.
TRIG.
LEVEL
CENT.
Place
the
HORIZ
DEF
PLATE
SELECTOR
Switch
in
the
TIME
BASE
AMP
position,
the
UPPER
BEAM
SENSITIVITY
switch
in
the
.5
VOLTS
PER
CM
position,
and
the
TRIG
GERING
LEVEL
Control
at
midrange.
Connect
50
millivolts
of
Calibrator
signal
to
input
A
of
the
UPPER
BEAM
vertical
amplifier
and
place
the
TRIGGER
SELECTOR
switch
in
the
UPPER
AC
position.
Ground
the
junction
of
R15
and
C
13
(See
Fig.
5-12)
by
placing
a
jumper
between
that
point
and
the
chassis.
Adjust
the
TRIG.
LEVEL
CENT
Control
so
that
the
sweep
will
trigger
correctly
with
the
TRIGGER
SELECTOR
Slope
Switch
in
either
the
+
or
—
positions.
Fig.
5-12.
Grounding
the
junction
of
R15
and
C
1
3.
For
adjustment
of
the
TRIG
LEVEL
CENT
and
DC
TRIG
controls,
the
junction
of
R15
and
C
1
3
is
grounded
as
shown.
31.
STABILITY
ADJUST
Disconnect
the
Calibrator
signal,
remove
the
jumper
from
the
junction
of
R15
and
C13
to
ground,
place
the
TRIGGERING
LEVEL
Control
in
the
AUTOMATIC
position
and
set
the
TIME/CM
control
to
.1m
SEC.
Connect
a
meter
from
the
wiper
arm
of
the
STABILITY
ADJUST
Potentiometer
to
ground.
Rotate
the
STABILITY
ADJUST
Control
clockwise
from
the
fully
counterclockwise
position.
Note
the
voltage
when
the
trace
first
appears
on
the
face
of
the
crt.
Con
tinue
to
rotate
the
STABILITY
ADJUST
Control
clockwise
until
the
trace
brightens
and
again
note
the
voltage.
Set
the
STABILITY
ADJUST
Control
so
that
the
voltage
reading
is
midway
between
the
two
voltages
previously
noted.
Fig.
5-13.
Adjustment
of
the
STABILITY
ADJUST
control.
32.
UPPER
BEAM
DC
TRIG
Position
the
TRIGGERING
LEVEL
Control
to
midrange
and
place
a
jumper
from
the
junction
of
R15
and
C
13
to
ground.
Place
the
UPPER
BEAM
SENSITIVITY
switch
in
the
.2
VOLTS
PER
CM
position
and
apply
50
MV
of
Calibrator
signal
to
input
A
of
the
UPPER
BEAM
vertical
amplifier.
Position
the
UPPER
BEAM
trace
under
the
upper
horizontal
centerline.
Place
the
TRIGGER
SELECTOR
switch
in
the
UPPER
DC
position
and
set
the
DC
TRIG
Control
so
that
the
sweep
will
trigger
on
either
the
+
or
—
positions
of
the
TRIGGER
SELECTOR
Slope
Switch.
33.
LOWER
BEAM
DC
TRIG
Leave
the
jumper
connected
as
in
step
32.
Place
the
LOWER
BEAM
Input
Selector
switch
in
the
A-DC
position
and
the
LOWER
BEAM
SENSITIVITY
switch
in
the
.2
VOLTS
PER
CM
position.
Connect
50
MV
of
Calibrator
signal
to
input
A
of
the
LOWER
BEAM
vertical
amplifier.
Place
the
TRIGGER
SELECTOR
switch
in
the
LOWER
DC
position
and
5-10

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