MIL-STD-1399-3008
5.1.6.1.2 Type II, 400 Hz frequency transients. Figure 10 illustrates the Type II, 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 2 seconds.
430
Worst Case
Envelope
426
420
410
400
400-Hz
Nominal
Frequency Tolerance Envelope
390
380
374
370
Worst Case
Envelope
0.01 0.1 1 10 100 1000
Time (Seconds)
FIGURE 10. Type II worst case and frequency tolerance envelopes.
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