TM 11-5840-281-35/1
Control settings
Step No.
Test equipment
Equipment under test
Test procedure
Performance standard
g.
g.
RANGE MILES: 5
Disconnect vtvm test leads -.-
None.
PPI CENTERING
NORM OFFSET:
NORM
2
---------------------------------- As last indicated, except:
a.
a.
On top deck of Pulse Generator
None.
Master Pulse Generator
O-1333/TPN-18 in Control-
0-1333/TPN-18
Indicator C-6988/TPN-18
under test, adjust PPI DELAY
SCAN: ON
control R1105 to position initial
(first) range mark so it is just
visible at sweep origin (start
of sweep). Push in Pulse
Generator O-1333/TPN-18
and tighten two thumbscrews.
b.
b.
Observe ppi scan on Control-
5-mi range ppi scan with
Indicator C-6988/TPN-18
first four 1-mi range
under test.
marks at lower intensity
level.
c.
c.
On master Pulse Generator
10-mi range ppi sweep
O-1333/TPN-18, place RANGE
with 5-mi and 10-mi range
MILES switch to 10 and ob-
marks at higher intensity
serve ppi scan on Control-
level than 1-mi range
Indicator C-6988/TPN-18
marks.
under test.
d.
d.
On Pulse Generator 0-1333/
20-mi range ppi scan
TPN-18 of Control-Indicator
with four 5-mi range
C-6988/TPN-18, under test,
marks at normal operat-
place RANGE MILES switch
ing intensity level.
to 20 and observe ppi scan.
3
---------------------------------- As last indicated -------
a.
a.
On Control-Indicator C-6988/
None.
TPN-18 under test, adjust ppi
CENTERING VERT NORM
control to off center sweep to
top edge of crt.
b.
b.
Observe eighth 5-mi range
40-mi range ppi scan
mark and end of sweep at
with eight 5-mi range
bottom of crt.
marks. Sweep ends just
beyond 40 mi.
c.
c.
Adjust PPI CENTERING
None.
VERT NORM control to
center sweep origin.
d.
d.
Place RANGE MILES switch
40-mi range mark is
to 40 and observe 40-mi range
approximately 3/16 in.
mark.
from edge of crt.
e.
e.
Place RANGE MILES switch
None.
to 10.
f.
f.
Rotate PPI CENTERING
Sweep origin moves off
HORIZ NORM control fully
right side then moves
cw and then fully ccw.
off left side of crt.
g.
g.
Adjust PPI CENTERING
None.
HORIZ NORM control to
center sweep origin.
h.
h.
Rotate PPI CENTERING
Sweep origin moves off
VERT NORM control fully
top of crt then moves off
cw and then fully cow.
bottom of crt.
4
As last indicated, except:
:a.
a.
On Control-Indicator C-6988
Sweep origin moves off
Control-Indicator
TPN-18 under test, rotate
right side then moves off
C-6988/TPN- 18
PPI CENTERING HORIZ
left side of crt.
Under Test
OFFSET fully cw and then
PPI CENTERING
fully ccw.
4-36
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