MIL-STD-1275E
threshold is defined to be the time when the amplitude is equal to ninety percent (90%) of the maximum value of the transient.
3.5.2 Fall time.
The fall time is the difference between when the falling edge of a voltage or current transient crosses a pre-defined high threshold to when the transient crosses a pre-defined low threshold. As defined in this standard, the high threshold is defined to be the time at when the amplitude of
the falling edge is equal to ninety percent (90%) of the maximum value of the transient. The low threshold is defined to be the time when the amplitude is equal to ten percent (10%) of the maximum value of the transient.
3.5.3 Recovery time.
The interval between the time a characteristic deviates from the steady-state limits and the time it returns and remains within the same range. Refer to Figure 1.
Figure 1. Recovery time.
3.5.4 Ripple.
The regular and/or irregular variations of voltage about a fixed DC voltage level during normal operation of a DC system.
3.6 Types of transient waveforms.
There are several different types of transient waveforms associated with the vehicle's power
supply system.
3.6.1 Starting disturbance.
A starting disturbance is the variation in system voltage from the normal operating voltage range caused by the initial engagement of the engine starter and subsequent engine cranking. The duration of the Initial Engagement Surge (IES) is measured from the time at which it departs from the normal operating voltage to the time at which it reaches and remains at the cranking
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