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
ACCURACY NOTE: For the following inspections mount telescope on
EVALUATION
preset Azimuth Testing Fixture. Refer to page
2-58 for setup instructions.
21
Eyepiece Focus
Eyepiece focus shall be tested with aid of calibrated
dioptometer adjusted for best focus of dioptometer
reticle. Position dioptometer at telescope eyepiece.
Telescope reticle shall be in best focus within -0.75
to -1.0 diopter, as measured on dioptometer scale.
-
Parallax
Parallax in center of the field (geometric center of
the reticle) shall not exceed 0.15 mil while viewing a
target set at 130 + 10 m For purpose of this test,
thickness of telescope reticle line may be considered
as equal to 0.10 mil.
-
Definition
The telescope shall produce sharp and clear image
at center field of view when checked with the aid of
dioptometer.
-
Image Tilt
Position pre-plumbed collimator telescope, at eye-
piece of M115 panoramic telescope, so that the
optical axes of the two telescopes lie in parallel
planes. When line of sight is directed through the
auxiliary telescope and M115 panoramic telescope
to target, image of vertical reticle line shall be within
1 degree, as measured on projector collimator test
reticle. Refer to TM 9-254.
--
Parallelism of Reticle and Image
Vertical reticle line shall be parallel to image of a
plumb line, within 30 minutes of arc, at any deflec-
tion setting through at least 2 full revolutions of
head Refer to TM 9-254.
2-6
