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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20

15                                                                                                                                                                       Upper Limit

Variable Frequency

10

3.1600

5

0                                                                                                                                                                                                                                      1.0000

Upper Limit

-5                                                                                                           400 Hz

-10

0.3160

-15

-20

0.1000

-25

-30

0.0316

-35

10                                        100                                     1,000                                   10,000                                 100,000                              1,000,000

Frequency, Hertz

FIGURE 7.  Maximum distortion spectrum of 400 Hz and variable frequency AC voltage.

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