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Tektronix 502A

Tektronix 502A
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Operating
Instructions
—
Type
502A
CUPS
TO
DEFLECTION
PLATE
PINS
NOTE:
TO
AVOID
GROUNDING
LEADS
USE
INSULATED
SLEEVING
WHERE
NECESSARY.
4=0.1
nt
TO
SIGNAL
SOURCE
tube
sockets.
Before
connecting
the
resistors
to
the
leads
from
the
amplifier,
slip
a
piece
of
insulated
sleeving
(spa
ghetti)
over
the
wire.
Then,
after
making
the
connections,
draw
the
sleeving
back
over
the
insulated
resistor
pigtail.
This
will
prevent
the
leads
from
accidentally
shorting
to
the
chassis.
The
crt
pins
are
easily
bent
and
you
must
exercise
care
when
making
these
connections
to
avoid
breaking
the
glass
seal.
CAUTION
Do
not
allow
the
leads
from
the
oscilloscope
am
plifiers
to
touch
the
chassis
when
the
power
is
on.
A
short
circuit
of
this
type
can
damage
the
ampli
fier
circuits.
Fig.
2-13.
Typical
circuit
for
ac
coupling
to
the
crt
deflection
plates.
coupling
is
shown
in
Figure
2-13.
Here,
the
leads
from
the
oscilloscope
amplifier
are
removed
and
a
resistor
is
con
nected
between
each
lead
and
its
respective
crt
pin.
A
good
value
for
this
resistor
in
most
cases
is
1
megohm.
The
vertical
deflection
plate
pins
are
located
on
the
sides
of
the
crt
neck
and
the
horizontal
deflection
plate
pins
are
located
on
the
top
of
the
neck.
A
convenient
method
for
connecting
the
resistors
to
the
crt
pins
is
to
use
clips
removed
from
standard
miniature
If
it
is
desired
t
o
couple
the
signal
directly
to
the
crt
plates
(d
c
coupling),
it
will
be
necessary
to
supply
positioning
volt
ages
from
the
signal
source.
These
voltages
must
also
satisfy
the
requirement
of
an
average
level
of
+225
volts,
mentioned
previously.
To
d
c
couple
the
signal
to
the
deflec
tion
plates,
remove
the
leads
from
the
crt
pins
and
fold
them
back,
out
of
the
way.
Taping
the
ends
of
the
wires
will
prevent
accidental
shorting
to
the
chassis.
Connect
the
exter
nal
signal
source
to
the
pins
of
the
crt.
The
vertical
deflection
factor
of
the
crt
is
approximately
13
volts
per
centimeter.
The
horizontal
deflection
factor
is
approximately
17
volts
per
centimeter.
®1
2-11

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