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|  MIL-I-60166(MU)
3.2.3 Circuitry - An electrical schematic diagram shall be provided with
each inverter. This schematic shall provide all the information required to
trouble shoot and repair the inverters. If modules are used the circuitry shall be
shown.
3.3 General specification. - The inverter shall meet the requirements of
Specification MIL-I-13926, as specified below. Should any conflict exist between
the general specification and this specification, this specification shall take
precedence.
(a)
Order of precedence
Dimensions and tolerance
(b)
Inorganic protective surface finishes
(c)
Part identification and marking
(d)
Workmanship
(e)
3.4 Reliability. - The inverter shall be operated 0 continuously for 600 hours in
a horizontal position and 400 hours in a position at 180 from the horizontal with0 a
direct current (de) input of 30 volts (v) and at an ambient temperature of 150 4 F.
The rated full load output shall be maintained at 150 volt-amperes (VA) with the least
efficient power factor between 0.8 leading and O. 6 lagging. Subsequent to this
operation, the inverter sha11 meet the requirements of 3.7 at room ambient tempera-
0
ture (75 15 F).
3.5 Environmental.
3.5.1 Temperature shock. - The inverter shall show no evidence of physical
damage and shall meet the requirements of 3.7 at room ambient temperature
after-exposure to the following temperature excursions in uniterupted sequence.
0
Unless otherwise specified ambient temperature extremes shall be within + 4 F.
(a) A gradual increase from room ambient temperature with a
0
2 hour exposure at 160 F (see 6.4).
(b) Decrease (60 + 1 minutes) to 65F and maintained 2 hours
(c) Gradual reduction in temperature with a 2 hour exposure at .80F
(see 6.4).
(d) Gradual increase in temperature to 75 15F.
3.5.2 Vibration. - The inverter shall show no evidence of damage when vibrated
for 10 minutes in each direction of the 3 mutually perpendicular axes total of 30
minutes) relative to its normal operating position. 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 1 minute + 15 seconds. During vibration the inverter shall meet
the requirements of 3.7.
3.
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