MIL-PRF-62546C
TABLE I. False alarm susceptibility.
Immunity distance
mm 1/ (in. 1/)
Radiation source description
Small fire
Large fire
Sunlight
IAD 2/
IAD
Incandescent frosted glass light, 100 Watt (W) 150 (6)
25 (1)
Incandescent clear glass light, rough service,
225 (9)
50 (2)
100 W
Fluorescent light with white enamel reflector, 150 (6)
IAD
standard office or shop, 40 W
(or two 20 W)
Electrical arc [12 mm (15/32 in.) gap at
25 (1)
25 (1)
4000 V 1/ alternating current, 60 Hz 1/]
Ambient light extremes (vehicle darkness to
IAD
IAD
bright light with snow, water, rain, desert
glare and fog)
Bright color clothing, including red and safety IAD
IAD
orange at 1500 mm (60 in.) and to near zero
Electronic flash (180 watt-seconds minimum
450 (18)
225 (9)
output)
Movie light, 625 W quartz DWY lamp
1200 (48)
600 (24)
(Sylvania S.G.-55 or equivalent)
Red vehicular dome light
IAD
IAD
Blue-green vehicular dome light 24 V of
IAD
IAD
direct current (dc)
Flashlight
IAD
IAD
Indirect or reflected sunlight
IAD
IAD
Chopped light - individual sources
3/
3/
Chopped light - combination of sources
4/
4/
Radiation heater, 1500 W
900 (36)
450 (18)
Radiation heater, 1000 W with fan
600 (24)
300 (12)
Arc welding 4 mm (5/32 in.) rod; 300 A 1/
1500 (60)
300 (12)
Acetylene welding 00 tip, 16 x 150 mm
1500 (60)
300 (12)
(5/8 by 6 in.) flame
Rifle flash from M16 rifle
250 (10)
50 (2)
Muzzle flash from 105 mm gun
5/
5/
Lit cigar
100 (4)
25 (1)
Lit cigarette
100 (4)
25 (1)
Match, wood, including flare up
300 (12)
100 (4)
Match, paper, including flare up
200 (8)
100 (4)
1/ Abbreviations as follows:
mm millimeters
in.
inches
V
volts
A
amperes
Hz
hertz
6
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