MIL-PRF-62546C
3.3.3.2 False alarm susceptibility. The OFSA shall respond to radiation stimuli as
indicated in the following paragraphs.
3.3.3.2.1 Radiation stimuli. The OFSA shall not respond at distances equal to or greater
than the immunity distance when exposed to the radiation sources of table I throughout the FOV
of the OFSA (except for chopped light requirements) (see 4.3.3.7 through 4.3.3.7.15).
3.3.3.2.2 Penetrating munitions. Type I OFSAs shall not respond to the high intensity,
short duration emissions (in relation to hydrocarbon fires) caused by munition penetration of
aluminum and steel armors. The OFSA shall demonstrate a minimum discrimination level (not
generate large fire signals on pin C) as shown in table II (see 4.3.3.8).
3.3.3.2.3 Nuclear hardening. Requirements for nuclear survivability shall be as specified
in a separate classified (confidential) document entitled "Nuclear Survivability Criteria for the
Automatic Fire Extinguishing System (AFES)" (U) (see 4.3.3.9 and 6.9).
3.3.3.2.4 Slow growth pan-fire. The OFSA shall generate output signal "A" on pins C
and D when exposed to a slow growth pan-fire (4.3.3.10 and 4.3.3.10.1).
3.3.3.3 Start-up. The OFSA shall not false alarm upon the application of 15 to 30 Vdc
step inputs across pins A and B (initial power-on condition) (see 4.3.3.11).
3.3.3.4 Power. The OFSA shall be effective over an input voltage range of 15 to 30 Vdc,
in accordance with appendix A, and shall not require more than 150 milliamperes (mA) when
active. The OFSA shall not draw more than 15 mA nor less than 7.5 mA during quiescent
operation (see 4.3.3.12).
3.3.3.4.1 Input voltage decay. The OFSA shall not false alarm (produce small or large
fire output signals) when undergoing input voltage decays resulting from prolonged operation
without recharging of the battery (see 4.3.3.13).
3.3.3.4.2 Steady state voltage extremes. The OFSA shall sustain no damage from the
application of any steady state voltage up to 40 Vdc. Subsequently, the OFSA shall meet the
requirements of 3.3.3.1 and 3.3.3.2 (see 4.3.3.14).
3.3.3.5 Electromagnetic interference (EMI). The OFSA shall meet the requirements
specified below (see 4.3.3.15).
3.3.3.5.1 Conducted emissions (30 Hz to 50 kilohertz (kHz)). Electromagnetic
emissions shall not appear on dc power lead (primary or secondary) in excess of the values
shown in figure 1.
3.3.3.5.2 Conducted emissions (10 kHz to 50 megahertz (MHz)). Electromagnetic
emissions shall not appear on ac or dc power leads in excess of the values shown in figures 1
through 4.
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