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Tektronix 502A

Tektronix 502A
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Calibration
Procedure
—
Type
502A
10.
NORM
MAG
REGIS
Turn
the
TRIGGERING
LEVEL
to
RECURRENT
and
place
the
HORIZONTAL
DISPLAY
switch
in
the
X20
position.
Posi
tion
the
start
of
the
upper
trace
under
the
vertical
centerline
of
the
graticule.
Rotate
the
HORIZONTAL
DISPLAY
switch
to
NORMAL
and
adjust
the
NORM
MAG
REGIS
Control
so
that
the
start
of
the
sweep
again
lies
under
the
vertical
centerline
of
the
graticule.
Repeat
adjustments
9
and
10
until
both
are
set
correctly.
11.
Check
Timing
from
.1
millisecond
through
5
seconds
From
the
Type
180A
apply
time
markers
to
the
A
input
of
both
beams
as
indicated
below.
Adjust
for
a
stable
display
and
check
for
proper
display.
Disconnect
Time
Markers.
TIME/CM
TIME
MARKERS
DISPLAY
1
mSEC
1
MILLISECONDS
1
marker/cm
2
mSEC
1
MILLISECONDS
2
markers/cm
5
mSEC
5
MILLISECONDS
1
marker/cm
10
mSEC
10
MILLISECONDS
1
marker/cm
20
mSEC
10
MILLISECONDS
2
markers/cm
50
mSEC
50
MILLISECONDS
1
marker/cm
100
mSEC
100
MILLISECONDS
1
marker/cm
200
mSEC
100
MILLISECONDS
2
markers/cm
500
mSEC
500
MILLISECONDS
1
marker/cm
1
SEC
1
SECONDS
1
marker/cm
2
SEC
1
SECONDS
2
markers/cm
5
SEC
5
SECONDS
1
marker/cm
.1
mSEC
100
MICROSECONDS
1
marker/cm
12.
Fast
Sweep
Rate
Adjustments
Turn
the
TIME/CM
Control
to
10
SEC
and
the
TRIGGER
ING
LEVEL
to
RECURRENT.
Set
the
input
switch
of
the
test
oscilloscope
to
DC.
Connect
a
probe
from
the
test
oscilloscope
to
pin
3
of
V
1
83
and
adjust
C311
for
a
flat
base
on
the
holdoff
waveform.
This
is
just
a
preliminary
adjustment
of
C31
1.
Adjustment
of
the
faster
sweep
rates
is
indicated
in
the
chart
below.
The
1
SEC
and
the
5
SEC
timing
adjustments
will
interact
and
therefore
will
have
to
be
rechecked
several
times.
Apply
time
markers
to
both
A
inputs
and
trigger
the
display.
Disconnect
Time
Markers.
TIME/CM
TIME
MARKERS
FROM
TYPE
180A
ADJUST
OR
CHECK
10
SEC
10
MICROSECONDS
Adjust
C160C
for
1
marker/cm
20
SEC
10
MICROSECONDS
Check
for
2
markers/cm
50
SEC
50
MICROSECONDS
Check
for
1
marker/cm
1
SEC
1
MICROSECONDS
Adjust
C31
1
for
1
marker/cm
2
SEC
1
MICROSECONDS
Check
for
2
markers/cm
5
SEC
5
MICROSECONDS
Adjust
C160A
for
1
marker/cm
13.
EXT
HORIZ
AMP
DC
BAL
Rotate
the
HORIZONTAL
DISPLAY
switch
through
the
EXT
VOLTS/CM
positions
and
adjust
the
EXT
HORIZ
AMP
DC
BAL
Control
so
that
there
is
no
horizontal
shift
of
the
spots
as
the
HORIZONTAL
DISPLAY
switch
is
rotated.
14.
Checking
External
Gain
and
Attenuator
Apply
5
volts
to
the
EXTERNAL
connector
from
the
AMPLI
TUDE
CALIBRATOR.
With
the
HORIZONTAL
DISPLAY
switch
set
in
the
2
EXT.
VOLTS/CM
position
check
for
a
deflection
of
2.5
cm.
Check
the
other
positions
of
the
display
switch
for
the
proper
deflection.
Return
the
HORIZONTAL
DISPLAY
switch
to
the
NORMAL
position
and
disconnect
the
jumper.
NOTE
The
following
adjustments
apply
to
both
of
the
vertical
amplifiers.
Complete
the
calibration
of
one
amplifier
before
proceeding
to
the
other.
A.
B.
C.
Fig.
5-6.
Adjustment
of
C311.
Waveforms
A
and
C
result
from
improper
settings
of
C311.
Capacitor
C311
should
be
adjusted
so
that
waveform
B
is
obtained
on
the
test
oscilloscope.
5-5

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