AIR
FORCE
T033A1-13-496-1
NAVELEX
0969-LP-1
70-0010
Maintenance
Instructions
Table
5-1.
Operational
Checkout Procedures—Continued
Step
Procedure
Normal Indication
e.
Adjust
monitor
oscilloscope VAR TIME/DIV
so
the
negative portion
of
the pulse
is 1 division wide.
f.
Rotate oscilloscope
under test
A
TRIGGER HOLDOFF
fully clockwise.
Negative portion of pulse
width
expands
to 3
divisions
or more.
g.
Rotate oscilloscope
under test
A
TRIGGER
HOLDOFF fully counter-
clockwise
into the NORM detent.
h.
Set
monitor oscilloscope VAR TIME/DIV
to
its
calibrated
detent.
i. Set controls
as
follows:
HORIZ DISPLAY
B SOURCE
A
AND
B
TIME/DIV
B
DLY'D
STARTS
AFTER DELAY
2
^s
24.
a.
Change monitor oscilloscope input
from
-tA
GATE
to +B
GATE on
oscilloscope under test.
Chopped
Mode
Repitition
Rate.
Preset
controls
as
listed in
step
1 .a.;
then
reset as
follows.
A
AND
B
TIME/DIV
1
/iS
VERT
MODE
CHOP
A
LEVEL
Stable
display
5
volt positive pulse within
0.5
volt.
3.33
to 5 division
between the
start
of
each
complete wave
cycle of the display.
25.
Calibrator
Output.
a.
Connect
CH 1
input to
the
CALIBRATOR
with
a
probe.
b.
Preset the
controls as
listed
in step 1 .a.;
then
reset
as
follows:
CH 1
AC-GND-DC
DC
VOLTS/D
IV
.5
A
AND B
TIME/DIV
1
ms
Square
wave
of 2
divisions
peak
to peak
at
1
kilo-
hertz
within
0.1 kilohertz
(a
period
of
1.8
to 2.2
divisions).
5-2. PREVENTIVE
MAINTENANCE.
Operator
preventive
maintenance
consists
of
external
inspection
and
cleaning.
Instrument
repair
agency
preventive
maintenance
consists of
external
and
internal
inspection,
cleaning,
and
lubrication.
When
performed
regularly,
preventive mainte-
nance can
prevent instrument
breakdown
and
improve
reliability.
a. Preventive Maintenance Schedule.
Preventive mainte-
nance
schedules
are usually established
by
a
combination of
user
policies, equipment
uses,
and equipment environ-
mental
conditions. Lacking this guidance. Table
5-2
is
a
re-
commended preventive maintenance schedule for
instru-
ments in
continuous use.
Table
5-2.
Preventive
Maintenance Schedule
—
As
required
Monthly
Semiannual or
1000 instru-
ment hours
External cleaning X i
External inspection X
Internal
cleaning
X
Internal
inspection
X
Calibration
X
5-20