TM 11-5840-281-35/1
Control settings
Step No.
Test equipment
Equipment under test
Test procedure
Performance standard
b.
b.
NORM-OFFSET:
Adjust PPI CENTERING
None.
OFFSET
HORIZ OFFSET to center
sweep origin on crt.
c.
c.
Rotate PPI CENTERING
Sweep origin moves off
VERT OFFSET control fully
top of crt then moves off
cw and then fully ccw.
bottom of crt.
d.
d.
Adjust PPI CENTERING
None.
VERT OFFSET control to
center sweep origin.
a.
a.
On Control-Indicator C-6988/
Outer range mark on
5---------------------------------------- As last indicated, except:
TPN-18 under test, observe
all ranges falls within
Pulse Generator
5-mi range mark on crt, then
1/4 in. of each other
O-I333/TPN-18
place Pulse Generator 0-1333/
under test
TPN-18 RANGE MILES
switch to 10, 20, 40 and 80.
RANGE MILES: 5
a.
On Control-Indicator C-6988/
a.
None.
TPN-18 under test, adjust
6---------------------------------------- As last indicated, except:
PPI CENTERING HORIZ
Pulse Generator
OFF-SET controls to position
0-1333I/TPN-18
offset sweep origin at top
center of crt on path of centered
under test
sweep 20-mi range mark.
RANGE MILES: 20
b.
On Control-Indicator C-6988/
b.
Range marks in offset
TPN-18 under test, check
sweep pass within 1/8 in.
sweep linearity by alternately
of range marks in
placing PPI CENTERING
centered sweep or over-
OFFSET NORM switch to
lap range marks in
OFFSET and NORM while
centered sweep no more
observing range marks on crt.
than 1/8 in.
a.
On Control-Indicator C-7988/
a.
None.
TPN-18 under test, adjust
PPI CENTERING HORIZ
OFFSET and PPI CENTER-
ING VERT OFFSET controls
7---------------------------------------- As last indicated, except:
Pulse Generator
to position offset sweep origin
at top center of crt on path of
0-1333/TPN-18
centered sweep 5-mi range
under test
mark.
RANGE MILES: 5
b.
Repeat step 6b --------------
b.
Same as step 6b.
a.
On Control-Indicator C-6988/
a.
None.
TPN-18 under test, adjust
PPI CENTERING HORIZ
OFFSET and PPI CENTER-
ING VERT OFFSET controls
to position offset sweep origin
8---------------------------------------- As last indicated, except:
at top center of crt on path of
Pulse Generator
center of crt on path of
0-1333/TPN-18
centered sweep 10-mi range
under test
mark.
RANGE MILES- 10
b.
Repeat step 6b --------------
b.
Same as step 6b.
a.
On Control-Indicator C-6988/
a.
None.
TPN-18 under test, adjust
PPI CENTERING HORIZ
OFFSET and PPI CENTER-
ING VERT OFFSET controls
to position offset sweep origin
at top center of crt on path of
9---------------------------------------- Same as last indicated,
centered sweep 40-mi range
except:
mark.
Pulse Generator
b.
Repeat step 5b ------------------------
b.
Same as step 5b.
0-1333/TPN-18
under test
RANGE MILES: 40
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