Table  1-5.  Electrical  Performance  Characteristic  Parameters  AC  Precise  (Class  1) Characteristic   parameter a. Voltage  characteristics 1. Regulation   (%) 2. Steady-state-stability  (variation)  (bandwidth  %) (a) Short term (30 seconds) (b) Long term (4 hours) 3.  Transient  performance (a) Application of rated load (1) Dip (%) a. 60 Hz — b. 400 Hz (2)  Recovery  (seconds) (b)  Rejection  of  rated  load (1) Rise (%) a. 60 HZ b. 400 Hz (2)  Recovery  (seconds) (c) Application of simulated motor load (twice rated current) (1) Dip (%) a. 60 Hz b. 400 Hz (2) Recovery to 95% of rated voltage (seconds) (Note 1) 4. Waveform (a)  Maximum  deviation  factor  (%) (b)  Maximum  individual  harmonic  (%) 5. Voltage unbalance with unbalanced load (%) (Note 2) 6. Phase  balance  voltage  (%) 7. Voltage  adjustment  range (a) 50 Hz (120/208 volts) 50  Hz  (240/416  volts) (b)  60  Hz  (120/208  volts) 60  Hz  (240/416  volts) Value 1 1 2 15 12 0.5 15 12 0.5 30 25 0.7 5 2 5 1 190 to 213 volts 380  to  426  volts 197  to  240  volts 395 to 480 volts Test  method MIL-STD-705 608.1 608.1 608.2 619.2 619.2 619.2 619.2 619.2 619.2 619.1 619.1 619.1 601, 1 601.4 620.2 508.1 511.1 511.1 1-50