ARMY TM 9-6115-643-24 AIR FORCE TO 35C2-3-445-22 1.10  DIFFERENCES BETWEEN MODELS. 1.10.1 The differences between models of the generator sets covered in this manual areas follows: a. Model MEP-804A is equipped with a 50/60 Hz generator, 50/60 Hz frequency meter, and frequency selector switch. b. Model MEP-814A is equipped with a 400 Hz generator and 400 Hz frequency meter. 1.10.2 Performance characteristics for the two models are shown in TABLE 1-2. TABLE   1-2.   Performance   Characteristics 1.  Voltage: (a)  Voltage  waveform deviation  factor: Single voltage harmonics: (b) Voltage unbalance (c) Phase balance voltage (d) Voltage modulation (e) Voltage regulation (f) Short-term stability (30 seconds) (g) Long-term stability (4  hours) (h) Voltage drift (60°F (16°C) in 8-hour period) (i) Dip and rise for rated load Recovery time (j)  Dip for low power factor load Recovery time (k) Adjustment range VAC 120/208V  connection 240/416V  connection 120/208V  connection 240/416V  connection MEP-804A 5% (max) 2% (max) 5% of rated voltage (max) 1% of rated voltage  (max) 2% (max) 1% (max) 1% of rated voltage 2% of rated voltage ±1% (max) 15% of rated voltage  (max) 0.5 seconds 30% of no-load voltage (max) 0.7 seconds 95% of no-load voltage 50 Hz 190-213V 380-426V 60 Hz 197-240V 395-480V MEP-814A 5% (max) 2% (max) 5% of rated voltage (max) 1% of rated voltage  (max) 2% (max) 1%  (max) 1% of rated voltage 2% of rated voltage ±1% (max) 12% of rated voltage (max) 0.5 seconds 25%   of   no-load   voltage (max) 0.7 seconds 95% of no-load voltage 400 Hz 197-229V 395-458V 1-8