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|  MIL-I-19028E(OS)
3.3.1.3.6.2 Individual harmonic voltages. All harmonic voltages except
the 7th shall not exceed 1 percent of the fundamental output voltage. The
7th harmonic voltage shall not exceed 1.5 percent of the fundamental out-
put voltage.
3.3.1.3.7 Modulation. Output voltage modulation shall not exceed 1
percent of the output voltage when the inverter is operating in accord-
ance with 3.3.1.2.2.
3.3.1.3.8 Response time
3.3.1.3.8.1 Step-voltage start. At 3 seconds maximum after the inverter
is started under the conditions of 3.3.1.2.2, the output voltage, phase
balance, and frequency shall be within, and remain within, the limits of
3.3.1.3.2 and 3.3.1.3.3.
3.3.1.3.8.2 Increasing voltage start. Within 11 seconds maximum after
the inverter is started in accordance with 3.3.1.2.1, the output voltage,
phase balance, and frequency shall be within, and remain within, the limits
of 3.3.1.3.2 and 3.3.1.3.3.
3.3.1.3.9 Recovery time. At 0.1 second maximum after the inverter load
is instantaneously switched from 62 plus or minus 2 percent to 98 plus or
minus 2 percent of rated load, the AB phase voltage shall be within, and
remain within, 115 plus or minus 1 volts rms; the output frequency shall
be within, and remain within, 400 plus or minus 4 Hz. These requirements
shall be met under the input requirements of 3.3.1.1.
3.3.1.4 Efficiency. The minimum efficiency of the inverter, at 98 plus
or minus 2 percent rated load, shall be not less than 40 percent. The
minimum efficiency of the inverter at 62 plus or minus 2 percent rated load
shall be not less than 35 percent.
3.3.1.5 Commutation. Commutation shall be such that not more than fine
pinpoint sparking occurs when the inverter is operated at 98 plus or minus
2 percent and 62 plus or minus 2 percent of rated load.
3.3.1.6 Dielectric requirements
3.3.1.6.1 DC circuits. All dc circuitry of the inverter must be capable
of withstanding 500 volts rms, 60 Hz to the frame, with the ac circuits
grounded to the frame, for a period of at least 1 minute without any arc-
ing or breakdown of insulation.
3.3.1.6.1.1 The initiation resistance at 500 volts dc shall be 100 megohms
minimum between all inverter dc circuits and the frame, with all ac circuits
grounded to the frame.
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