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|  MIL-I-19028E(OS)
3.3 Performance requirements and product characteristics. The inverter
shall meet the following performance requirements and product characteris-
tics:
3.3.1 Performance requirements
3.3.1.1 Input
3.3.1.1.1 Source voltage. The nominal steady state source voltage shall
be within 26 plus or minus 2 volts dc open circuit.
3.3.1.1.2 Circuit impedance. The total impedance looking back from the
inverter terminals to the source voltage shall be within 0.07 to 0.09 ohm
resistive, inclusive of all metering resistances. This impedance shall
apply to all tests.
3.3.1.1.3 Peak starting current. The peak current shall not exceed
200 amperes, with 98 plus or minus 2 percent rated load connected to the
inverter at a source voltage of 28 plus or minus 0.2 volts dc.
3.3.1.1.3.1 Decay time. Within 1.0 second after starting the inverter,
the input current shall be less than the arithmetic average of the peak
starting current and the final running current.
3.3.1.2 Starting conditions
3.3.1.2.1 Increasing voltage. The starting voltage as measured at
the source terminals shall not deviate by more than 2 volts peak from the
following curve: V = 10 + 1.6t where V = dc input volts
t = time in seconds measured from
turn on
until a steady state value of 26 plus or minus 2 volts dc is reached with
a load of 62 plus or minus 2 percent of rated load.
3.3.1.2.2 Step voltage. The inverter will be subjected to the follow-
ing step-voltage conditions:
3.3.1.2.2.1 Open circuit source voltage prior to starting at 24 plus
or minus 0.2 volts dc; inverter load at 98 plus or minus 2 percent of
rated load.
3.3.1.2.2.2 Open circuit source voltage prior to starting at 24 plus
or minus 0.2 volts dc; inverter load at 62 plus or minus 2 percent of
rated load.
3.3.1.2.2.3 Open circuit source voltage prior to starting at 28 plus
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