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|  MIL-S-19819C(OS)
before the applied acceleration reaches 6.0 gravity units, and shall reach
a state of steady closure before the applied acceleration reaches 6.5 grav-
ity units,
3.4.5 Contact resistance. The contact resistance of the switch during
steady closure shall be not more than 0.5 ohm, as measured between the two
terminals of the switch.
3.4.6 Dielectric strength. When the firing is in the normally open con-
dition, the insulation resistance, as measured between the terminals of the
switch, shall be not less than 10 megohms under an applied potential of 500
volts direct current (dc).
3.4.7 Operating life. The firing switch shall have an operating life of
not less than 100 complete cycles as defined in 4.3.5.1.
3.4.8 Pressure, external hydrostatic (Type I only). The Type I firing
switch assembly shall withstand a pressure of 750 psig, applied to the outer
face of the firing switch, without breaking, deforming, or showing evidence
of leakage through the housing.
3.5 Environmental requirements. The firing switch shall meet the other
applicable requirements of this specification after or while being subjected
to environmental conditions defined below, when tested as specified in Sec-
tion 4.
3.5.1 Vibration
3.5.1.1 Vibration; ready nonoperating or ready condition. The firing
switch, less pack or packaging and rigidly self-mounted on a vibration device
as specified in 4.3.1.1, shall be capable of withstanding vibrations of 3g's
over the frequency range of 10 to 100 Hz in each of three mutually perpendi-
cular planes for time periods and temperatures as specified in 4.3.1.1.
Thereafter, the switch shall show no damage and shall be capable of meeting
all the performance requirements and product characteristics of this speci-
fication.
3.5.1.2 Vibration: operating condition. The firing switch, self-mounted
on a vibration device as specified in 4.3.1.2, shall be capable of with-
standing vibrations of 1g over the frequency range of 20 to 150 Hz in each
of three mutually perpendicular directions for time periods and temperatures
as specified in 4.3.1.2. Thereafter, the switch shall show no damage and
shall be capable of meeting all the performance requirements and product
characteristics of this specification.
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