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Tektronix 585 - Page 10

Tektronix 585
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Operating
Instructions
—
Type
585
Fuse
Data
Fuse
data
is
silk-screened
on
the
rear
panel
of
the
instru
ment
adjacent
to
the
fuse
holder.
Use
only
the
recom
mended
fuses
for
maximum
over-current
protection.
proper
contact.
Tighten
the
plug-in
unit
locking
control
to
hold
the
unit
securely
in
place
and
turn
the
oscilloscope
INTENSITY
control
fully
counterclockwise.
Connect
the
power
cord
to
the
rear
of
the
instrument
and
to
the
power
line
and
place
the
POWER
switch
in
the
ON
position.
OSCILLOSCOPE
OPERATING
INFORMATION
If
you
are
familiar
with
other
Tektronix
Oscilloscopes,
you
should
have
very
little
difficulty
in
understanding
the
opera
tion
of
the
Type
585.
The
function
of
many
controls
is
the
same
as
the
function
of
corresponding
controls
on
other
Tektronix
instruments.
Plug-In
Units
The
Type
585
Oscilloscope
is
designed
to
operate
with
the
Tektronix
Eighty
Series
Plug-In
Units.
In
addition,
the
Type
81
Plug-In
Adapter
permits
use
of
all
of
the
Tektronix
Letter-Series
plug-in
units.
The
particular
plug-in
unit
used
must
be
selected
to
satisfy
the
application
requirements.
In
selecting
the
plug-in
unit
for
any
particular
application,
consider
the
bandpass,
sensitivity,
the
type
of
input
required
for
that
application.
The
plug-in
units
now
available
and
those
presently
under
development
will
satisfy
the
require
ments
for
most
applications.
Preparation
for
Use
When
the
plug-in
unit
to
be
used
has
been
selected,
insert
the
unit
into
the
plug-in
compartment
of
the
Type
585
oscillo
scope
and
press
firmly
to
insure
that
the
connectors
make
Fig.
2-2.
A
typical
high-voltage
fan
connection,
using
as
an
example
the
wiring
for
a
248-volt
supply.
Time
Delay
A
time
delay
relay
used
in
the
Type
585
Oscilloscope
delays
operation
of
the
instrument
for
approximately
25
seconds
after
the
POWER
switch
is
turned
on
to
allow
a
brief
tube
warmup
period.
The
delay
allows
the
tubes
sufficient
time
to
heat
before
the
d
c
operating
voltages
are
applied.
If
the
ac
power
is
off
for
only
an
instant,
the
normal
25
second
delay
will
occur
before
the
instrument
returns
to
full
operation.
This
delay
will
occur
regardless
of
whether
the
ac
power
is
off
because
of
momentary
power
failure
or
is
turned
off
with
the
POWER
switch.
INTENSITY
Control
The
INTENSITY
control
is
used
to
adjust
the
brightness
of
the
oscilloscope
display.
This
permits
compensation
for
changes
in
brightness
resulting
from
changes
in
the
sweep
or
triggering
rate.
The
INTENSITY
control
is
rotated
clock
wise
to
increase
brightness
and
counterclockwise
to
decrease
brightness.
Care
must
be
taken
when
using
the
INTENSITY
control
that
the
brightness
is
not
turned
up
to
the
point
where
the
face
of
the
cathode-ray
tube
is
permanently
damaged.
If
the
intensity
of
the
beam
is
turned
up
too
far,
the
phosphor
on
the
face
of
the
c
rt
may
be
burned.
FOCUS
and
ASTIGMATISM
Controls
The
FOCUS
and
ASTIGMATISM
controls
operate
together
to
allow
a
sharp,
clearly
defined,
spot
or
trace
to
be
ob
tained.
FOCUS
adjustments
need
to
be
made
after
each
change
of
the
INTENSITY
control.
For
slow
sweep
rates,
proper
adjustment
of
the
ASTIGMATISM
control
will
produce
a
circular
spot,
then
adjust
the
FOCUS
control
for
as
small
a
spot
as
possible.
For
fast
sweep
rates
with
low
repetition
rates
that
produce
a
dim
trace,
best
focus
can
be
obtained
by
looking
at
the
waveform
and
simultaneously
adjusting
the
ASTIGMATISM
and
the
FOCUS
control.
There
is
a
maxi
mum
setting
of
the
INTENSITY
control
above
which
a
good
focus
is
not
possible.
Best
definition
for
all
signals
will
be
obtained
by
using
the
horizontal
center
six
centimeters
of
the
graticule.
Graticule
and
Scale
Illumination
Control
The
graticule
used
with
the
Type
585
Oscilloscope
is
accurately
marked
with
10
horizontal
and
4
vertical
1-
centimeter
divisions
with
2-millimeter
markings
on
the
center
lines.
These
graticule
markings
in
conjunction
with
the
cali
brated
scale
factors
of
the
Type
585
allow
time
and
voltage
measurements
to
be
made
directly
from
the
oscilloscope
crt.
The
graticule
is
illuminated
by
two
lamps
located
at
the
top
edge
of
the
graticule.
This
illumination
can
be
con
trolled
so
that
the
graticule
markings
appear
either
red
or
2-2
A
A

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