AIR FORCE
T033A1
-13-496-1
NAVELEX
0969-LP-170-0010
Operation Instructions
d.
Pull on the
POWER
switch. The ON indicator
should
light; if it
blinks, the line voltage is
too
low.
e.
Allow
the instrument
a
few minutes
to
warm up
(if
actual
measurements
are
to be taken, allow 5
minutes when
the
instrument has been stored in
a
temperature above
0°;
20 minutes
for lower temperatures).
4-7. PRELIMINARY ADJUSTMENTS.
Before
using the
instrument
for
the first
time, make the following
preliminary settings and adjustments,
then perform a
NORMAL OPERATION functional
check.
a.
Initial
Control
Settings.
Set the
controls
as
follows
(both
channels
if
applicable):
VOLTS/DIV
.2
in
10X
probe
window
VAR
Fully clockwise
(cali-
brated detent)
POSITION
Midrange
AC-GND-DC
DC
VERT
MODE
CH
1
INVERT
Out
(normal)
20
MHz BW
In
(off)
TRIG
MODE
AUTO
LEVEL
Midpoint of
+
slope,
then adjust as
neces-
sary
SLOPE
OUT-i-
COUPLING
AC
A
SOURCE
CH 1
B
SOURCE
STARTS
AFTER
DELAY
DELAY
TIME POS
Fully counterclockwise
A and B
TIME/DIV
.2 ms
AVAR
Fully clockwise
(cali-
brated detent)
HORIZ
DISPLAY
A
X10 MAG
OUT
(off)
A TRIGGER
HOLDOFF
NORM
SCALE ILLUM
Fully counterclockwise
POSITION,
INTEN,
Midrange
and FOCUS
NOTE
A t this point there
should be a trace
displayed,
if not, recheck control settings.
Then press
BEAM
FINDER and adjust
the POSITION
controls
so the trace is centered
vertically and
horizontally on
the crt.
If no trace appeared
when
BEAM FINDER was pressed,
the in-
strument
is malfunctioning. If
the
trace
ap-
peared and could be centered,
but disappeared
when BEAM FINDER
was released, increase
the
INTEN control.
b. Intensity Adjustment. Set the INTEN
control for
a
comfortable
viewing level. Later when
FOCUS and ASTIG
are
adjusted,
INTEN
may need readjustment.
To protect the
crt
phosphor,
do
not turn
the INTEN control higher
than necessary
to provide
a
satisfactory
display. Since
the blue
faceplate filter reduces
the dis-
play light
output, avoid using
too high an
INTEN
setting with this filter.
When more
intensity is
desired, use the
dear
filter
or
reduce the ambient
light level.
The intensity
may increase
too
high when
changing
the
TIME/DIV
settings from
a
fast
to a slow
sweep speed.
c.
Focus
and
Astigmatism
Adjustment. Adjust the
FOCUS
and ASTIG
controls as follows:
(1)
Connect
a
probe
to
either
vertical channel. Then
connect the probe
to the CALIBRATOR
output. Set VERT
MODE
to the channel being used.
(2)
Adjust FOCUS
so horizontal portion
of display is
focused.
(3)
Adjust INTEN
so
rising
portion of the
display can
be seen
(If
display is unstable,
A
LEVEL
may need
adjust-
ment).
(4)
Adjust
ASTIG
so
horizontal
and vertical
portions
of display
are as equally
focused
as possible.
(5)
Adjust FOCUS
so vertical
portion of display
is
as
thin
as possible.
(6)
Repeat
steps
(4)
and
(5)
for
best overall
display
focus.
(7)
Disconnect the
probe from
the
CALIBRATOR
output.
d. Trace
Rotation
Adjustment.
Adjust
the TRACE
ROTATION
control
as
follows:
(1)
Set
AC-GND-DC
to GND.
(2)
Vertically
position
the trace
to the center
hori-
zontal
graticule line.
4-38
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