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Tektronix 502A

Tektronix 502A
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Calibration
Procedure
—
Type
502A
Fig.
5-4.
Adjustment
of
the
GEOM
control.
In
waveform
A
the
GEOM
control
is
improperly
set
causing
bowing
of
the
vertical
lines.
In
waveform
B
the
bowing
of
the
vertical
lines
has
been
reduced
to
a
minimum
by
the
proper
adjustment
of
the
GEOM
control.
vertical
portions
of
the
markers
are
displayed
on
the
face
of
the
crt
and
adjust
the
TRIGGERING
LEVEL
Control
to
obtain
a
stable
display.
Set
the
GEOM
control
for
minimum
curvature
of
the
vertical
lines
at
the
sides
of
the
crt.
8.
Adjusting
CRT
HORIZ
SENS
BAL
and
HORIZ
BEAM
REGIS
From
the
Type
1
80A
apply
100
MICROSECONDS
and
1
MILLISECONDS
markers
to
the
A
input
of
the
LOWER
BEAM
and
the
B
input
of
the
UPPER
BEAM.
Switch
the
UPPER
BEAM
Input
Selector
to
B-DC
and
the
SENSITIVITY
switches
of
both
beams
to
5
VOLTS
PER
CM.
With
the
Vertical
POSITION
Controls,
position
the
traces
until
the
markers
of
the
LOWER
BEAM
are
just
touching
the
markers
of
the
UPPER
BEAM.
Adjust
the
HORIZ
BEAM
REGIS
until
the
first
and
ninth
time
markers
are
as
near
being
above
one
another
as
possible.
Now
adjust
the
CRT
HORIZ
SENS
BAL
until
the
sensitivity
of
the
two
beams
is
the
same.
At
this
point
in
the
calibration
the
two
beams
are
being
matched
to
each
other
and
the
time
markers
may
not
coincide
with
the
graticule
marks.
NOTE
Every
time
the
CRT
HORIZ
SENS
BAL
is
adjusted
the
INT
BAL
must
be
checked.
The
HORIZ
BEAM
REGIS
may
also
have
to
be
readjusted
at
this
time.
The
above
three
controls
interact
with
each
other.
9.
X
1
CAL
and
X20
CAL
Adjustments
Set
the
UPPER
BEAM
Input
Selector
to
the
A-DC
position.
With
1
MILLISECONDS
and
100
MICROSECONDS
time
markers
applied
to
the
A
input
of
each
beam
reset
the
HORIZONTAL
DISPLAY
switch
to
X20
position.
Adjust
the
X20
CAL
for
a
display
of
one
100
MICROSECONDS
time
marker
per
2
cm.
Now
turn
the
HORIZONTAL
DISPLAY
Switch
to
X
1
and
adjust
the
X
1
CAL
for
one
1
MILLI
SECONDS
time
marker
every
cm.
Fig.
5-5.
Adjustment
of
the
X20
control.
The
X20
CAL
control
is
adjusted
in
the
calibration
procedure
for
the
correct
magnified
sweep
rate.
The
control
should
be
set
so
that
markers
occur
at
2
centimeter
intervals.
There
will
be
interaction
between
the
X
1
and
X20
adjust
ments.
After
this
interaction
has
been
removed
the
X2
and
X5
and
X10
positions
of
the
HORIZONTAL
DISPLAY
switch
should
be
checked.
Disconnect
the
time
markers.
5-4

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