TM-9-1240-400-34-P
TELESCOPE; PANORAMIC: M115, ELBOW: M139, MOUNT: M138 AND M137
TECHNICAL MANUAL; DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE MANUAL
OCTOBER 1993
TM-9-1240-400-34-P - Page 24 of 344
TM 9-1240-400-34&P
2-5.
CATEGORIES OF INSPECTION (CONT).
Table 2-1.
INITIAL INSPECTION-M115 PANORAMIC TELESCOPE (CONT)
ITEM
ITEM T0
NO.
BE INSPECTED
PROCEDURE
--
Lift (Deflection)
During level travel test, direction of head rotation
shall be reversed.
Any vertical displacement of line
of sight with respect to horizontal target line resulting
from this reversing of travel shall not exceed 0.5 mil.
This test shall be performed at minimum of eight
800-mil deflection (azimuth) settings.
--
Backlash
This test should be conducted at same time as level
travel test.
While rotating deflection knob, backlash
in deflection counter must not exceed 1.0 mil, and
backlash in reset counter must not exceed 1.25 mil.
--
Open Sight
While viewing a calibrated wall target positioned 50
ft (15 m) from objective end of telescope, line of
sight through boresight mark of telescope reticle
shall be horizontal and parallel in deflection, with
respect to line of sight of open sight, within +10 mils.
ILLUMINATION
NOTE:
For the following evaluations apply 24 volt dc
EVALUATION
power supply to electrical input circuits.
22
Counters
Counter illumination shall be sufficient for numerals
and markings of each counter to be clearly distin-
guishable when observed in darkened area.
--
Reticle
When observed in darkened area with reticle LED
energized with 24 volts dc, reticle markings must be
clearly defined.
2-8
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