TM 11-5840-281-35/1
Control settings
Step No.
Test equipment
Equipment under test
Test procedure
Performance standard
CHANNEL B SENSI-
TIVITY VERNIER:
As required
CHANNEL B AC-DC:
DC
CHANNEL B
POLARITY: +UP
...............................As last indicated.
2
a. On Control-Indicator C-6988/
a. None.
TPN-18 under test, adjust
INTENSITY and FOCUS
controls for normal operating
level and definition.
b. Observe beta scans for normal
b. Normal azimuth and
azimuth and elevation pre-
elevation scans with
sentations with range marks
range marks and cursors
and cursors present.
present.
8
...............................As last indicated, except:
On Pulse Generator 0-1333/
None.
Pulse Generator
TPN-18 in Control-Indicator
OI-SSI/TPN-I 8
C-6988/TPN-18 under test,
under test
adjust ANGLE VOLTS con-
ANGLE VOLTS switch:
trol until cursor dot is between
EL
15 and 20 mi on artificial
elevation sweep.
4
...............................As last indicated
a. On oscilloscope, adjust CHAN-
a. None.
NEL A VERTICAL POSI-
TION, CHANNEL A
SENSITIVITY, CHANNEL
B VERTICAL POSITION,
and CHANNEL B SENSI-
TIVITY controls to position
cursor sawtooth (TP2602) and
fill-in sawtooth (TP2603) on
oscilloscope so that both
waveforms are observed with-
out limiting (fig. -41).
b. Observe slope and linearity
b. Slope of fill-in sawtooth
of cursor sawtooth and fill-in
matches slope of cursor
sawtooth waveforms.
sawtooth and slope of
both waveforms is
linear.
5
...............................As last indicated, except:
a. On Control-Indicator C-6988/
a
No excessive widening
Pulse Generator
TPN-18 under test, observe
or
O-1333/TPN-18
azimuth and elevation cursors.
breaks in azimuth and
under test
Examine cursors for breaks in
elevation cursors.
ANGLE VOLTS switch:
cursors and excessive widening.
OPERATE
b. On master Pulse Generator
b. Elevation scan changes
0-1333/TPN-18, place
SCAN MODE control to 350
from 10 scan to 850
EL.
scan.
c. On Control-Indicator C-6988/
c. No excessive widening
TPN-18 under test, observe
azimuth and elevation cursors.
or breaks in azimuth and
Examine cursors for breaks
elevation cursors.
and excessive widening.
d. Place EL CURSOR switch to
d. Height finder cursor
HF.
e. Adjust ALTITUDE control
pres-
ent on elevation scan.
on Pulse Generator 0-1333/
e. None.
TPN-18 to position height
finder in approximate middle
of elevation scan.
4-58
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