MIL-PRF-22885H
3.32 Overload cycling. When switches are tested as specified in 4.7.27, there shall be no mechanical or electrical
failure.
3.33 Electrical endurance. When switches are tested as specified in 4.7.28, no contact shall fail to open or close
its individual circuit in proper sequence. The temperature rise shall not exceed 50°C when measured as specified in
4.7.28.3. The contact resistance, unless otherwise specified, shall not exceed 1 percent of the load resistance using
the electrical parameters of the electrical endurance test load. After the test, switches shall be electrically and
mechanically operative; there shall be no deformation, melting, delamination, or blistering of the pushbutton/lens
assembly and the legend shall be legible.
3.34 Mechanical endurance. When switches are tested as specified in 4.7.29, the switches shall be electrically
and mechanically operative. No contact shall fail to open or close its individual circuit in proper sequence. The lamp
retention test plug shall remain captive to the lampholder following the test specified in 4.7.29b.
3.35 Intermediate current (when specified) (see 3.1 and 6.2). When switches are tested as specified in 4.7.30, no
contact shall fail to close or open its individual circuit in proper sequence as detected by the relay and monitoring
device. Switch contact resistance shall not exceed 1 percent of load resistance following electrical life at rated load.
3.36 Low level circuit (when specified) (see 3.1). When switches are tested as specified in 4.7.31, the contact
resistance of any individual switch circuit shall be less than 3.0 ohms during each contact closure. No contact shall
fail to open or close its individual circuit in proper sequence.
3.37 Logic level circuit (when specified, see 3.1). When switches are tested as specified in 4.7.32, there shall be
no contact sticks or misses detected by the monitoring device. A voltage of 2.1 volts or greater across the switch
terminal shall constitute a contact miss (failure to properly close the circuit). A voltage drop of less than 90 percent of
the open-circuit voltage shall constitute a contact stick (failure to properly open the circuit).
3.38 EMI/RFI shielding (when applicable) (see 3.1 and 6.2). When switches are tested as specified in 4.7.33.1,
screen to mounting surface resistance shall not exceed 1 ohm. When switches are tested as specified in 4.7.33.2,
the shielding attenuation shall be not less than 60 dB over the frequency range from 100 MHz to 1,000 MHz, unless
3.39 Illuminated colors. When switches are tested as specified in 4.7.34, the illuminated colors of the lens shall be
3.40 Luminance. When switches are tested as specified in 4.7.35, the measured photometric brightness in foot
3.41 Sunlight readability (when specified) (see 3.1 and 6.2). When switches are tested as specified in 4.7.36, the
average contrast ratio of each lighted legend character to the background shall be 0.6 minimum unless otherwise
specified (see 3.1); and the average contrast ratio of each unlighted legend character to the background shall have
3.42 Night vision imaging system (NVIS) compatibility (when specified, see 3.1 and 6.2). When switches are
tested as specified in 4.7.37, the chromaticity, luminance, and spectral radiance output of the illuminated display shall
be NVIS compatible as specified in MIL-L-85762: NVIS green A and NVIS green B colors shall meet all class A and
class B equipment requirements for illuminated controls. NVIS yellow color shall meet all class A and class B
equipment requirements for caution signals. NVIS red color shall meet all class B equipment requirements for
warning signals.
3.43 Stray lights (when specified) (see 3.1). The display lighting system shall be so housed as to minimize stray
light and to shield all lamp filaments from direct view. When switches are tested as specified in 4.7.38, the stray light
emitted shall not exceed 0.20 foot lamberts in any direction.
3.44 Field of view. When switches are tested as specified in 4.7.39, the visibility of any signal, legend, symbology
or alpha-numerics shall not be restricted by the periphery of the enclosure for the display.
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