MIL-STD-704 Aircraft Electric Power CharacteristicsThis standard establishes the requirements and characteristics of aircraft electric power provided at the input terminals of electric utilization equipment. MIL-HDBK-704-1 through-8 defines test methods and procedures for determining airborne utilization equipment compliance with the electric power characteristics requirements defined herein. Electromagnetic interference and voltage spikes are not covered by this standard.

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Steady state characteristics

Limits

Steady state voltage

Voltage unbalance Voltage modulation Voltage phase difference Distortion factor Distortion spectrum

Crest factor

DC component

Steady state frequency

Frequency modulation

108.0 to 118.0 Volts, RMS

3.0 Volts, RMS maximum

2.5 Volts, RMS maximum

116° to 124°

0.05 maximum

Figure 7

1.31 to 1.51

+ 0.10 to - 0.10 Volts

393 to 407 Hz

4 Hz

Transient characteristics

Limits

Peak voltage

Voltage transient

Frequency transient

±271.8 Volts

Figure 3

Figure 5

Steady state characteristics

Limits

Steady state voltage

Voltage unbalance Voltage modulation Voltage phase difference Distortion factor Distortion spectrum

Crest factor

DC component

Steady state frequency

Frequency modulation

108.0 to 118.0 Volts, RMS

3.0 Volts, RMS maximum

2.5 Volts, RMS maximum

116° to 124°

0.05 maximum

Figure 7

1.31 to 1.51

+0.10 to - 0.10 Volts

360 to 800 Hz

4 Hz

Transient characteristics

Limits

Peak voltage

Voltage transient

Frequency transient

Maximum rate of change of frequency

±271.8 Volts

Figure 3

Not to exceed steady state values of 360 to 800 Hz

250 Hz/sec