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Tektronix 502A

Tektronix 502A
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Calibration
Procedure
—
Type
502A
24.
Setting
GAIN
ADJ
FOR
HORIZ
MODE
Turn
the
HORIZ
DEF
PLATE
SELECTOR
to
the
UPPER
BEAM
AMP
position
and
both
of
the
vertical
SENSITIVITY
switches
to
.2
VOLTS
PER
CM.
Connect
a
50kc
sine-wave
signal
from
the
generator
to
the
A
and
B
connectors
of
each
vertical
amplifier.
This
may
be
done
with
jumpers.
The
cable
used
to
connect
the
generator
to
the
oscilloscope
should
be
terminated
on
each
end
with
a
50
termination.
Set
the
Input
Selector
switch
of
the
LOWER
BEAM
to
A-DC
and
the
switch
of
the
UPPER
BEAM
to
A-B
(DIFF)-DC.
Adjust
the
length
of
the
vertical
line
with
the
amplitude
control
on
the
sine-wave
generator
until
the
line
is
8cm
high.
After
adjusting
the
vertical
line
for
8cm,
turn
the
UPPER
BEAM
Input
Selector
to
A-DC
and
the
Input
Selector
switch
of
the
LOWER
BEAM
to
A-B
(DIFF)-DC.
The
display
should
now
be
one
horizontal
line.
Now
set
the
GAIN
ADJ
FOR
HORIZ
MODE
(R489)
until
the
horizontal
line
is
8cm
long.
Eye
Opening
Fig.
5-10.
Method
of
determining
eye
opening
for
X-Y
phasing
check.
25.
X-Y
Phasing
Check
With
the
HORIZ.
DEF.
PLATE
SELECTOR
still
in
the
UPPER
BEAM
AMP
position
insert
sine-wave
frequencies
of
the
amplitude
and
cps
as
indicated
below.
A
convenient
way
of
measuring
the
proper
amplitude
of
the
input
signal
is
outlined
below.
With
the
SENSITIVITY
switches
of
each
amplifier
in
the
proper
range
and
the
input
signal
coupled
to
both
the
A
and
B
input
connectors
of
each
amplifier,
place
the
LOWER
BEAM
Input
Selector
to
A-DC
and
the
UPPER
BEAM
Input
Selector
to
A-B
(DIFF)-DC.
The
vertical
line
may
be
used
to
determine
the
amplitude
of
the
input
signal.
Once
the
proper
amplitude
has
been
determined,
turn
the
UPPER
BEAM
Input
Selector
switch
to
A-DC.
Check
to
see
that
the
eye
opening
of
the
lissajous
waveform
is
about
the
same
as
that
listed
below.
The
eye
opening
measurement
of
the
lissajous
waveform
should
be
made
near
the
center
of
the
crt
screen.
NOTE
When
placing
attenuators
in
the
line
to
achieve
proper
amplitude,
be
sure
to
place
them
between
the
50
terminator
from
the
oscilloscope
and
the
coax
cable.
Disconnect
all
cables
used
above.
SENSITIVITY
Range
Input
Freq.
Amplitude
i
Typical
Eye
Opening
.2
VOLTS
PER
CM
1
m
c
3
cm
2.5
mm
100
mVOLTS
PER
CM
400
kc
6
cm
5
mm
50
mVOLTS
PER
CM
400
kc
6
cm
|
5
mm
20
mVOLTS
PER
CM
200
kc
6
cm
5
mm
10
mVOLTS
PER
CM
200
kc
6
cm
5
mm
5
mVOLTS
PER
CM
200
kc
6
cm
5
mm
2
mVOLTS
PER
CM
200
kc
6
cm
5
mm
1
mVOLTS
PER
CM
200
kc
6
cm
5
mm
.5
mVOLTS
PER
CM
100
kc
6
cm
|
5
mm
.2
mVOLTS
PER
CM
100
kc
6
cm
5
mm
.1
mVOLTS
PER
CM
50
kc
6
cm
5
mm
NOTE
The
verticals
will
now
be
done
one
at
a
time
until
the
calibration
of
the
verticals
has
been
completed.
26.
Measuring
Vertical
Response
Switch
the
HORIZ.
DEF
PLATE
SELECTOR
to
TIME
BASE
AMP,
the
HORIZONTAL
DISPLAY
switch
to
NORMAL,
Input
Selector
to
A-DC
and
the
SENSITIVITY
switch
to
the
.2
VOLTS
PER
CM
position.
Apply
the
input
sine-wave
to
the
A
input
connector
of
the
vertical
amplifier.
The
cable
should
be
terminated
into
50
ohms
on
each
end.
On
each
position
of
the
SENSITIVITY
switch
first
insert
4cm
of
1
k
c
sine-wave
from
a
constant
amplitude
generator
and
then
switch
the
generator
to
the
higher
frequency
as
called
out
in
the
table
below.
Each
vertical
position
should
be
checked
for
the
proper
response.
5-8

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