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Page Title:
Reliability in mean-time-between-failures (MTBF). |
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|  MIL-T-85472A(AS)
than 300 hours. During this time, it shall not be necessary to readjust any
controls that are inaccessible to the operator during normal use.
3.4.1.2 Operating life. The test set group shall have a total operating
life of not less than 2000 hours with minimal servicing and replacement of
parts.
3.4.1.3 Reliability in mean-time-between-failures (MTBF). The test set
group shall have a specified mean (operating) time between failures of 300
hours when tested in accordance with 4.5.3.
3.4.2 Standard conditions. The following conditions shall be used to
establish the normal performance characteristics under standard conditions
for performing laboratory bench tests:
Room ambient (30
a.
Temperature
Altitude
Normal ground
b.
Vibration
c.
None
Humidity
d.
Room ambient up to 90 percent relative
humidity
e.
Input Power
115
volts, 60
Hz, 1 phase at
3400 volt-amperes, 30 (+2) (-0.0) volts
dc, 5 amperes
3.4.2.1 Service conditions. The test set shall operate as required under
any of the environmental service conditions or reasonable combination of
these conditions as specified in MIL-E-16400. except as modified herein:
3.4.2.1.1
Temperature.
a.
Operating. The test set group shall maintain specified
performance while exposed to low operating temperatures of
and high operating temperatures of +50
-O
b.
Non-operating.
The test set group shall not be damaged nor
shall operational performance be degraded when restored to
the operational temperature range after being subjected to
and a high
a nonoperating low temperature of -62
nonoperating temperature of +71
3.4.2.1.2 Vibration. The test set group shall meet the requirements of 4.9.2
for equipment transported as secured cargo.
3.4.2.1.3 Shock. The test set shall be capable of withstanding the Grade
A, Class I, shock requirements of MIL-S-901.
3.4.2.1.4 Humidity. The test set shall maintain the specified performance
when exposed to a relative humidity of 95 percent for both continuous and
Intermittent periods, including conditions wherein condensation takes place
in and on the equipment in the form of both water and frost.
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