MIL-STD-1399-3008
5.1.6.1.1 Type I, 60 Hz frequency transients. Figure 9 illustrates the Type I, 60 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 0.1 to 1.0 seconds after initiation of the disturbance. The frequency shall recover to the frequency tolerance band within 2 seconds.
64
Worst Case
Envelope
63
63.3
63.0
62
61.8
61
60-Hz Nominal
60
59
Surface Ship Frequency Tolerance Envelope
Submarine Frequency Tolerance Envelope
58.2
58
57
Worst Case
Envelope
56
56.7
57.0
0.01 0.1 1 10 100 1000
Time (Seconds)
FIGURE 9. Type I worst case and frequency tolerance envelopes.
18
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