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Tektronix 502A

Tektronix 502A
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Calibration
Procedure
—
Type
502A
13.
Coaxial
"Straight"
Connector.
(1)
14.
Jumpers,
6
inch
with
banana
plugs.
(3)
15.
A
constant
amplitude
sine-wave
generator
having
output
frequencies
of
1
kilocycle,
50
kilocycles,
100
kilocycles,
200
kilocycles,
400
kilocycles
and
1
megacycle.
The
generator
should
also
have
a
variable
output
amplitude
from
500
volts
to
2
volts.
If
a
constant
amplitude
generator
is
not
available
to
cover
the
above
ranges,
any
generator
which
has
the
proper
frequencies
and
output
amplitudes
may
be
used.
When
using
a
generator
which
does
not
have
a
constant
amplitude
feature
the
test
oscilloscope
should
be
used
to
monitor
the
output
of
the
generator.
By
use
of
the
oscilloscope
the
output
signal
from
the
generator
may
be
kept
at
a
constant
amplitude.
By
the
use
of
a
DB
box
or
an
attenuator
system,
the
signal
going
from
the
sine-wave
generator
to
the
Type
502A
may
be
reduced
to
the
proper
amplitude
for
the
high
sensi
tivity
ranges,
while
at
the
same
time
the
signal
going
from
the
sine-wave
generator
to
the
test
oscilloscope
may
be
kept
at
a
high
amplitude
to
enable
monitoring
for
a
constant
am
plitude
of
signal
out
of
the
sine-wave
generator.
Preliminary
NOMINAL
RESISTANCES
OF
POWER
SUPPLIES
SUPPLY
APPROX.
RESISTANCE
TO
GROUND
-150V
3.5
k
100
V
4
k
350V
10k
Connect
the
power
cord
and
the
ac
voltmeter
to
the
out
put
of
the
autotransformer.
Rotate
the
POWER
AND
SCALE
ILLUM
control
clockwise
to
the
ON
position
and
adjust
the
autotransformer
for
an
output
of
117
volts
(or
234
volts).
Allow
the
instrument
to
warm
up
for
several
minutes
before
proceeding
with
the
calibration
adjustments.
During
cali
bration,
periodically
check
the
input
voltage
to
the
instru
ment
and
adjust
the
autotransformer
as
necessary
to
main
tain
the
voltage
at
117
or
234
volts
except
when
the
power
supply
regulation
is
being
checked.
CAUTION
Do
not
reset
the
—
150
control
unless
the
power
supply
voltages
are
actually
out
of
tolerance
or
you
are
planning
to
perform
a
complete
calibra
tion
of
the
instrument.
Preset
the
front-panel
controls
of
the
Type
502A
as
follows:
POWER
AND
SCALE
ILLUM
PWR
OFF
INTENSITY
full
counterclockwise
INTENSITY
BALANCE
midrange
FOCUS
(both
beams)
midrange
TRIGGERING
LEVEL
midrange
TRIGGER
SELECTOR
+
LOWER
AC
MODE
Switch
NORMAL
TIME/CM
1
mSEC
VARIABLE
CALIBRATED
HORIZONTAL
DISPLAY
2
EXT
VOLTS/CM
HORIZONTAL
POSITION
midrange
AMPLITUDE
CALIBRATOR
OFF
HORIZ
DEF
PLATE
TIME
BASE
AMP
SELECTOR
The
following
applies
to
both
vertical
amplifiers:
Input
Selector
A-DC
SENSITIVITY
.2
VOLTS
PER
CM
VARIABLE
CALIBRATED
DC
BAL.
control
will
be
set
later.
VERTICAL
POSITION
midrange
Before
applying
power
to
the
instrument
the
resistances
of
the
power
supplies
should
be
checked.
The
typical
resis
tances
of
the
supplies
may
be
found
in
the
chart
below.
1.
Low-Volfage
Power
Supply
Connect
the
d
c
voltmeter
to
the
output
of
the
—
150
volt
power
supply.
Power
supply
output
test
points
are
shown
in
Fig.
5-2.
Set
the
—
150
Control
for
a
reading
of
—
150
volts.
Check
that
the
outputs
of
the
—
6.2,
+
100
and
+
350
volt
supplies
are
within
the
specified
+
or
—
3%
tolerances.
If
either
the
+
100
or
+3
50
volt
supplies
are
out
of
tolerance,
reset
the
—
150
control
slightly
until
all
power
supply
voltages
are
within
tolerances.
Vary
the
output
of
the
autotransformer
between
105
and
125
volts
(or
between
210
and
250
volts)
to
check
the
regula
tion
of
the
low
voltage
power
supplies.
The
power
supplies
must
regulate
within
+
or
—
3%
of
their
correct
voltages.
Fig.
5-2.
Power
Supply
voltage
test
points.
5-2
®2

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