MIL-PRF-49052G
3.9 Humidity. The unprotected assembly pretest values for gain and input
current shall not change by more than ±20 percent, the equivalent background
input (EBI) shall not increase by more than a factor of three, and all parameters
shall remain within the specification limits when subjected to not less than 90
percent relative humidity at temperatures varying between 21o C and 65o C for a
period of not less than 240 hours.
3.10 Workmanship. Standards of workmanship shall be such that the assembly
will meet all requirements of this specification and any referenced
specifications or drawings.
3.11 Electromagnetic interference (EMI). The assemblies manufactured under
this procurement shall meet the same EMI requirements as assemblies previously
accepted by the U.S. Government as part of AN/PVS-5( ) Night Vision Goggles (the
required tests for Night Vision Goggles are RE02, RS01, RS02, and RS03; see MIL-
PRF-49065). Test details, including the requirements below, shall be addressed
in the EMI test plan and test procedure. Test methods shall be in accordance
with Notice 4 to MIL-STD-461A and Notice 3 to MIL-STD-462.
a.
The frequencies to be tested under RE02 shall be 14 kHz to 10 GHz.
b.
The modified limitations during RE02 are as follows:
1.
20.5 kHz to
35.5 kHz
-
35 dB
2.
35.5 kHz to
88.0 kHz
-
45 dB
3.
88.0 kHz to 130.0 kHz
-
25 dB
4.
130.0 kHz to 340.0 kHz
-
20 dB
c.
The radiated susceptibility frequencies to be tested under RS03 are
10 kHz to 40 GHz.
3.12 Technical interpretations. The following technical interpretations
are, when referenced in sections 3, 4, or 5, mandatory for this specification.
3.12.1 Photocathode. The photocathode fiber optic faceplate is herein
referred to as the photocathode.
3.12.2 Phosphor. RCA F2126 (type No. 10-52) phosphor, or equal, shall
exhibit the decay characteristics specified herein. The peak relative spectral
response of the phosphor screen shall occur at a wavelength between 0.510 µm and
0.560 µm. The bandwidth shall be less than 0.200 µm measured at the 10 percent
points of the spectral response curve. Additionally, the relative response at
0.650 µm shall be less than or equal to 10 percent.
3.12.3 Distortion. The two types of distortion that are important in
imaging fiber optics are shear distortion and gross distortion.
3.12.3.1 Shear distortion. Shear distortion causes the image of a straight
line to have a discrete, localized, lateral displacement (i.e., a break). Shear
distortion is due to localized misalignment errors in the assembly of fibers or
multifibers. Shear distortion in fiber bundles is sometimes referred to as
incoherency.
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