Table 1-5. Electrical Performance Characteristic Parameters AC Precise (Class 1) (Cont)
Test method
Character parameter
Value
MIL-STD-705
(c) 400 Hz (120/208 volts)
197 to 229 volts
400 Hz (240/416 volts)
395 to 458 volts
511.1
b.
Frequency characteristics
1.
Regulation (%)
0.25
608.1
2.
Steady-state-stability (variation) (bandwidth %)
(a) Sort term (30 seconds)
0.5
608.1
(b) Long term (4 hours)
1
608.2
3. Transient performance
(a) Application of rated load
(1) Undershoot (%)
1.5
608.1
(2) Recovery (seconds)
1
608.1
(b) Rejection of rated load
(1) Overshoot (%)
1.5
608.1
(2) Recovery (seconds)
1
608.1
4.
Frequency adjustment range (Hz)
(a) 50 Hz
±2
511.2
(b) 60 Hz
± 2
511.2
(c) 400 Hz
+20
-10
511.2
NOTE
1. 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. The
load current to be 25 percent of the rated full load current of the set.
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