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|  MIL-I-19028E(OS)
4.4.4.2 Apply a source voltage of 26 plus or minus 2 volts dc to
the inverter. After it is operating in the steady state condition,
adjust the source voltage to obtain a voltage of 24 plus or minus
0.2 volts dc measured as near the inverter terminals as possible.
4.4.4.3 Adjust the inverter phase AB output voltage to 115 plus
or minus 0.5 volts rms in accordance with 3.3.2.1.1.
4.4.4.4 Adjust the inverter output frequency to 400 plus or minus
4 Hz in accordance with 3.3.2.2.1.
4.4.4.5 If necessary, readjust the voltage at the inverter terminals
to 24 volts dc, and recheck the output voltage and frequency settings
to see that they conform to 4.4.4.3 and 4.4.4.4. If positive locks are
provided on the voltage and frequency adjustment, tighten them securely.
4.4.5 Test procedure. See 3.3.2.4.3 for inverter terminal designa-
tions. The 98 plus or minus 2 percent rated load is obtained by using
the tapped parts of the 4.4.3.9 dummy load; the 62 plus or minus 2
percent of rated load is obtained by using the entire 4.4.3.9 dummy
load. The circuit impedance shall be as described in 3.3.1.1.2.
4.4.5.1 Starting conditions
4.4.5.1.1 Increasing voltage. Start the inverter as specified in
3.3.1.2.1. Perform and record the following measurements, using
equipment as specified in 4.4.3.
4.4.5.1.1.1 Regulation. When a steady state voltage of 26 plus or
minus 2 volts dc is attained, the output voltage measured at the termi-
nals shall be within the limits of 3.3.1.3.2 and the output frequency
shall be within the limits of 3.3.1.3.3.
4.4.5.1.1.2 Peak voltage. At no time during and after the starting
conditions of 4.4.5.1.1 shall the peak phase AB voltage, as measured
at the inverter output terminals with oscilloscope of 4.4.3.7, exceed
plus or minus 230 volts.
4.4.5.1.1.3 Transient voltage. At no time during and after the
starting conditions of 4.4.5.1.1 shall the dc input voltage, measured
as near the inverter input terminals as possible, exceed 35 volts peak.
4.4.5.1.2 Step voltage. For the starting conditions of 3.3.1.2.2,
measure and record the followimg:
4.4.5.1.2.1 DC input voltage. Measure and record the input voltage
as near the inverter terminals as possible, using a 0-50 volt dc volt-
meter (4.4.3.2.1).
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