MIL-PRF-22885/111B
TABLE II. Contrast ratio requirements for sunlight readable displays.
Contrast ratio 1/
Color
Minimum
Maximum
lighted
unlighted
code
Legend/LED color
UR
Ultra red
.90
.1
LG
Lime green
.60
.1
1/ With and without EMI/RFI shielding.
NVIS compatibility: When switches are tested as specified below, the chromaticity, luminance and spectral
radiance output of the illuminated display shall be NVIS compatible as specified in MIL-L-85762. The
following equipment requirements apply:
NVIS green B: Shall meet all class A and class B equipment requirements of MIL-L-85762 for illuminated
controls.
NVIS yellow: Shall meet type I class A, type II class A, and type II class B equipment requirements of
MIL-L-85762 for caution signals.
NVIS red: Shall meet type I class B, and type II class B equipment requirements of MIL-L-85762 for
warning signals.
The test procedure for measuring NVIS luminance, chromaticity, and spectral radiance shall be in
accordance with MIL-L-85762 for illuminated displays (for NVIS green B), caution signals (for NVIS yellow),
and warning signals (for NVIS red).
Touch temperature: Applicable to all body types of LED illuminated switches.
Requirements: When switches are tested as specified below, the maximum difference between the
stabilized lens face temperature and the ambient temperature shall not exceed +25°C.
Test method: The test method shall be in accordance with EIA-448-20 using the recommended panel
cutout (see figure 8). The test shall be performed with each of the standard LED voltages at full rated
current and at 100 percent duty cycle.
Marking: All required marking shall be permanent. Pushbuttons shall indicate the applicable nominal voltage
(5 V or 28 V). LED printed circuit boards shall be blue for current sinking configurations and natural or green
for current sourcing configurations. NVIS type and class marking are not required. The word "TOP" shall be
marked on switching housings and pushbuttons, excluding splashproof/watertight sealed units, to indicate
proper orientation.
Part or Identifying Number (PIN): The PIN shall be constructed as illustrated in the following example:
__________ Basic specification and detail configuration slash sheet number.
|
|
___ Codes from table III through table VII.
|
|
|
|
____|_____ |_______
M22885/111 E 2 4 4 G
| | | | |__Pushbutton display and LED configuration - table VII.
| | | |___ Pushbutton display circuit configuration - table VI.
| | |____ Switch housing and termination configuration - table V.
| |______ Switch circuit, action, and contact material - table IV.
|_______ Housing enclosure design - table III.
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