Table 1-5. Electrical Performance Characteristic Parameters AC Precise (Class 1) (Cont)Test methodCharacter parameterValueMIL-STD-705(c) 400 Hz (120/208 volts)197 to 229 volts400 Hz (240/416 volts)395 to 458 volts511.1b.Frequency characteristics1.Regulation (%)0.25608.12.Steady-state-stability (variation) (bandwidth %)(a) Sort term (30 seconds)0.5608.1(b) Long term (4 hours)1608.23. Transient performance(a) Application of rated load(1) Undershoot (%)1.5608.1(2) Recovery (seconds)1608.1(b) Rejection of rated load(1) Overshoot (%)1.5608.1(2) Recovery (seconds)1608.14.Frequency adjustment range (Hz)(a) 50 Hz±2511.2(b) 60 Hz± 2511.2(c) 400 Hz+20-10511.2NOTE1. The voltage shall stabilize at or above this voltage.2. The generator set connected for three phase output and supplying a single phase,unity power factor load connected line-to-linej with no other load on the set. Theload current to be 25 percent of the rated full load current of the set.1-51
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