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Tektronix 502A

Tektronix 502A
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Calibration
Procedure
—
Type
502A
15.
Gas
and
Hum
Check
With
jumpers,
ground
both
the
inputs
and
set
the
SENSI
TIVITY
switch
at
.2
mVOLTS
PER
CM.
Turn
TRIGGERING
LEVEL
to
RECURRENT
and
using
the
POSITION
and
DC
BAL
Controls,
position
the
trace
onto
the
crt.
The
use
of
the
DC
BAL
Control
may
be
found
in
Section
Two.
Now
turn
the
Input
Selector
switch
from
A-DC
to
A-AC
and
B-DC
to
B-AC.
The
trace
should
not
have
shifted
more
than
2
cm
during
the
switching
from
DC
to
AC.
To
check
for
hum,
observe
the
amount
of
hum
on
the
free
running
trace.
It
should
not
be
more
than
about
3
mm.
16.
.2V/CM
DIFF
BAL
Set
the
AMPLITUDE
CALIBRATOR
switch
at
.
5V
and
apply
the
calibrator
output
to
both
A
and
B
input
connectors
of
the
vertical
amplifier.
Place
the
SENSITIVITY
Control
in
the
.2
VOLTS
PER
CM
position
and
the
Input
Selector
switch
in
the
A-B
(DIFF)
DC
position.
Set
the
TIME/CM
switch
at
1
mSEC.
Position
the
trace
so
that
it
lies
behind
the
appro
priate
horizontal
centerline.
Adjust
the
.2
V/CM
DIFF
BAL
Control
for
minimum
vertical
deflection.
A-DC
position
and
the
SENSITIVITY
switch
in
the
.2
VOLTS
PER
CM
position.
Set
the
.2V/CM
GAIN
for
2.5
centimeters
of
vertical
deflection.
17.
.2MV/CM
DIFF
BAL
Place
the
SENSITIVITY
switch
in
the
.2
mVOLTS
PER
CM
position
and
position
the
trace
so
that
it
lies
behind
the
appropriate
horizontal
centerline.
Adjust
the
.2MV/CM
DIFF
BAL
Control
for
minimum
vertical
deflection.
Repeat
steps
16
and
17
until
both
adjustments
are
correct.
18.
.2V/CM
GAIN
Apply
a
.5
volt
signal
from
the
calibrator
to
input
A
of
the
vertical
amplifier.
Set
the
Input
Selector
switch
in
the
Fig.
5-8.
Setting
the
.2
V/CM
GAIN
control.
In
the
calibration
procedure,
the
.2
V/CM
GAIN
control
is
adjusted
for
2.5
centi
meters
of
vertical
deflection.
NOTE
To
trigger
the
display
properly
set
the
TRIGGER
SELECTOR
to
the
+
AC
position
for
the
beam
which
is
being
calibrated.
Fig.
5-7.
Adjustment
of
the
.2
MV/CM
DIFF.
BAL.
control.
If
the
.2MV/CM
DIFF.
BAL.
control
is
slightly
misadjusted,
a
waveform
similar
to
waveform
A
will
be
obtained.
Waveform
B
shows
a
typical
display
obtained
when
the
control
is
adjusted
properly.
5-6

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