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Model 1331A
Operation
SECTION 111
OPERATION
3-1.
INTRODUCTION.
3-2.
This
section contains
an
explanation
of Model
1331A operating
controls,
modes
of operation,
opera-
tor's
checks and adjustments,
a
nd step-by-step
opera
ting
instructions.
Table 3-1 contains
a
list
of
words
a
nd
phrases
used
to
describe the operation
of the
instrument.
3-3. CONTROLS AND CONNECTORS.
3-4.
All
controls
and
connectors are identified
a
nd
described in figure
3-1.
Controls requiring
further
explanation
a re covered
in the following
paragraphs.
3-5.
BEAM
FIND.
3-6. The
BEAM FIND
control is
a
slide switch
used
to
locate
the
beam
when
it
is
deflected
off
screen
due to
a large
input
voltage, misadjustment
of
the
POSITION
controls, or
a malfunction. To
operate
the BEAM FIND
contr
ol, proceed as
follows:
a.
Set INTENSITY fully
ccw.
b.
Set BEAM FIND to
ON.
c.
Turn INTENSITY
slowly cw
until
beam
is
visible.
d.
Determine
action
required
to return
beam
to
viewing
area.
e.
Set
BEAM
FIND to
off.
Model 1331A will
not
operate
correctly with
BEAM FIND set to
ON.
3-7.
INTENSITY.
A high
intensity
display
over an extended
period
of
time
can cause
burn damage to
the CRT
display
area.
Table
3-1.
Definitions
Word
or
Phrase
Definition
Write
To
transform an input signal
into
a
visual
display on the
CRT.
Persistence
The
length
of
time
a
display
remains
on
the
CRT
after the
writing
signal
has
been re-
moved.
Store
To
retain,
for
an extended
period
of
time,
a
display that has been written
on
the
CRT.
Erase
To remove
a
ll
displays
and
blooms
that
have
been written or
stored on
the
CRT.
Intensity
The
brightness
of a
display
written
on
the
CRT.
Bloom
Visible,
nonsymmetrica
l
expansion and
dis-
tortion of a
display
written on
the CRT.
Background
A
light-green
illumination
covering
the
en-
illumination
tire CRT viewing
area.
Fade
positive
An
increase
in
background illumination in-
tensity
occuring
in either
write or store
mode.
Fade
negative
A decrease
in trace
intensity
occuring in
either
write or
store
mode.
3-1
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