EMC; test pulse according to ISO 7637-2

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The full pulse specification is given in standard text. You'll notice that tr and td are not drawn to scale in the principle waveform. The smoothed waveform illustrates that the authors primarly thought of an RC circuit generating the pulse. Nevertheless any wavefom that keeps the specified timing should be acceptable. In so far it's up to you to either design a suitable generator circuit or use a tabulated waveform. Or any combination of it, e.g. a simple pulse smoothed by a low-pass filter.
 

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