MIL-STD-1399-3008
5.1.6.1.3 Type III, 400 Hz frequency transients. Figure 11 illustrates the Type III, 400 Hz frequency tolerance and worst-case frequency excursion envelope limits specified in Table I. The time to reach the transient minimum or maximum varies from 0.05 to 0.1 seconds after initiation of the disturbance. The frequency will recover to the frequency tolerance band within 0.25 seconds.
Worst Case
Envelope
406
404
402
400
400-Hz
Nominal
Frequency Tolerance Envelope
398
396
394
Worst Case
Envelope
0.01 0.1 1 10 100 1000
Time (Seconds)
FIGURE 11. Type III worst case and frequency tolerance envelopes.
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