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|  MIL-T-48558B(AR)
4.8.9 Image tilt. Test may be performed with the telescope
positioned as outlined in 4.8.2. The test is performed by
sighting through a pre-plumbed auxiliary telescope 5549108 and
observe parallelism between the center horizontal reticle line of
the target reticle and the horizontal reticle line of the
auxiliary telescope. Both horizontal lines must be parallel and
shall not exceed the limits of the angular lines of the target
reticle to assure compliance with 3.10.5.
4.8.10 Operability. The operability and torque of the
telescope's diopter adjustment, latch, attachment, and release
torque shall be tested by use of a torque wrench and appropriate
adapters at the temperatures specified for compliance with 3.12.1,
3.12.2, 3.12.3, and 3.12.2.1.
4.8.11 Illumination. The reticle illumination test shall be
performed under simulated conditions specified in 3.13.1. Place
Place
the instrument in a dark room having a controlled light source.
The observer and instrument must be dark adapted. Prior to
performing the test, place a white, matted surface approximately 2
feet from the telescope window. Perform the test by observing
reticle pattern and determine that this pattern is clearly
discernible by means of the self-illuminating source in the dark
room. Gradually raise the level of illumination to where the
pattern becomes indiscernible. Place a fixed stop having an
aperture of one-half inch over the objective window and observe
that the reticle pattern is again clearly discernible by means of
the self-illuminating source. Raise the ambient level of
illumination to 10 foot candle, remove the fixed stop and observe
the reticle pattern.
4.8.12 Radiological contamination. Contamination test shall
be performed by wiping the telescope with filter paper moistened
in distilled water. The wiping shall be performed with moderate
fomger pressure. The damp filter paper shall be placed in a
container with the proper portion of scintillation liquid. The
The
scintillating system used to measure contamination must be
calibrated. The read out shall be within 10% of the known
standard value when counted to a total of 2000 disintegrations.
The actual test for determining contamination is performed by
placing the container into the scintillation system. The measured
contamination shall be within the limits specified in 3.7.6.
4.8.13
Sealing
and
purging.
4.8.13.1 Sealing. The assembled elbow telescope shall be
capable of withstanding an internal pressure of 5 + 0.10 psig for
a period of 1 hour with no evidence of leakage. Prior to the
start of the test, secure the poppet valve in a closed position.
Then pressurize the telescope with dry nitrogen as specifies in
paragraph 3.8.1. Accuracy of the test equipment used for this
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