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Page Title:
Regulator performance: Environmental |
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|  MIL-R-48442(MU)
3.5 Regulator performance: Environmental .- The regulator shall
show no evidence of damage after exposure to 3.5.1 and 3.5.3 through
3.5.5. The regulator shall then be exposed. to 3.5.2. Specified
ambient temperature extremes shall be within 5F.
3.5.1 Temperature cycling and thermal shock.- The regulator shall
withstand in uninterrupted sequence the following ambient temperature
excursions:
(a) A gradual decrease from 75 15F to -80F, maintained
for
at least one hour.
(b) A gradual increase to -25F, maintained for at least
one
hour.
(c) Immediate exposure to 75 15F, maintained for at lest
one
hour.
(d) A gradual increase from 75 15F to 160F, maintained
for
at least one hour.
(e) A decrease to 125F, maintained for at least one hour.
(f) Immediate exposure to 75 15F.
3.5.2 Operating temperature.- Unless otherwise specified, the
regulator shall meet the requirements of 3.6 and 3.7, after at least
a tWO hour exposure, at the ambient temperatures of -40F and +125F.
3.5.3 Hermetic sealing.- When thermally stabilized at an ambient
temperature not in excess of 100F, the regulator shall exhibit no
evidence of compound or air leakage when immersed (for no less than
two minutes, and no more than three minutes) in a bath of water
maintained at a minimum ambient temperature of 180F.
3.5.4 Shock.- The regulator shall show no evidence of damage
when subjected to 6 shock pulses parallel to, and 6 shock pulses
perpendicular to its longitudinal axis, at an ambient temperature of
75 15F. Each shock impact shall have the following characteristics.
(a) A half-sine wave pulse of at least 75 gravity units
(G's) at its peak.
(b) A pulse duration of 6 2 milliseconds between the 10%
values of its peak amplitude.
(c) The energy under each shock curve shall-not be less
than 0.25 G second.
(d) The after oscillations shall not exceed 15% of the
nominal half-sine wave peak amplitude.
3.5.5 Vibration.- The regulator shall show no evidence of damage
when vibrated for 10 minutes in each of its 3 mutually perpendicular
axes (total of 30 minutes) at an ambient temperature of 75 15F.
The vibration shall be a simple harmonic motion having a 0.03 inch
amplitude (0.06 inch total excursion). The frequency shall vary
uniformly over a range of 10 to 55 cycles per second (cps) and
return to 10 cps in one minute.
3
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