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<blockquote style="position: relative; padding-left: 55px;"><section><a href="https://cybre.space/users/niconiconi/statuses/108719797609951309">niconiconi (niconiconi@cybre.space)'s status on Sunday, 07-Aug-2022 16:25:09 JST</a><a href="https://cybre.space/@niconiconi" title="niconiconi@cybre.space"><img src="https://gnusocial.jp/avatar/1903-48-20220726102800.webp" width="48" height="48" alt="niconiconi" style="position: absolute; left: 0; top: 0;">niconiconi</a><div><a href="https://cybre.space/@niconiconi/108718933565370185" rel="in-reply-to">in reply to</a></div></section><article><p>Success, the output waveform of my 8/20 μs impulse generator prototype is now IEC 61000-4-5 compliant! </p><p>Peak current: 200 A<br>Front time: 7.05 μs<br>Duration: 21.24 μs   <a href="https://cybre.space/tags/electronics" rel="tag">#electronics</a></p></article><footer><a rel="bookmark" href="https://gnusocial.jp/conversation/37771#notice-56433">In conversation</a><time datetime="2022-08-07T16:25:09+09:00" title="Sunday, 07-Aug-2022 16:25:09 JST">Sunday, 07-Aug-2022 16:25:09 JST</time> <span>from <span><a href="https://cybre.space/@niconiconi/108719797609951309" rel="external" title="Sent from cybre.space via ActivityPub">cybre.space</a></span></span><a href="https://cybre.space/@niconiconi/108719797609951309">permalink</a><h4>Attachments</h4><ol><li><label><a rel="external" href="https://gnusocial.jp/attachment/22146">A homebrew perfboard with four huge HV capacitors, some large HV power resistors, an air-core inductor coil, and a TO-220 thyristor at the center. At the left, there's a big red button, galvanic isolated from the HV power domain, for triggering the surge. At the leftmost side is a ready-mode HV power supply module.</a></label><br><a href="https://cybre.ams3.digitaloceanspaces.com/media_attachments/files/108/719/767/543/768/430/original/2624e3665be7eb47.jpg" rel="external">https://cybre.ams3.digitaloceanspaces.com/media_attachments/files/108/719/767/543/768/430/original/2624e3665be7eb47.jpg</a></li><li><label><a rel="external" href="https://gnusocial.jp/attachment/22147">The standard 8/20 μs impulse current waveform in IEC 61000-4-5.[Figure 3 – Waveform of short-circuit current (8/20 µs) at the output
of the generator with no CDN connected]Front time: T f = 1,25 × Tr = 8 µs ± 20 %
Duration: T d = 1,18 × Tw = 20 µs ± 20 %
Undershoot: 0% to 30%.NOTE 1 The value 1,25 is the reciprocal of the difference between the 0,9 and 0,1 thresholds.NOTE 2 The value 1,18 is derived from empirical data.</a></label><br><a href="https://cybre.ams3.digitaloceanspaces.com/media_attachments/files/108/719/779/918/749/976/original/0f1448d4f7ea52f8.png" rel="external">https://cybre.ams3.digitaloceanspaces.com/media_attachments/files/108/719/779/918/749/976/original/0f1448d4f7ea52f8.png</a></li><li><label><a rel="external" href="https://gnusocial.jp/attachment/22148">Oscilloscope measurement of the output waveform of the actual surge generator. Rise time is 5.363 μs, peak current 194 A, no undershoot.</a></label><br><a href="https://cybre.ams3.digitaloceanspaces.com/media_attachments/files/108/719/786/018/678/674/original/089537c35555ed5e.png" rel="external">https://cybre.ams3.digitaloceanspaces.com/media_attachments/files/108/719/786/018/678/674/original/089537c35555ed5e.png</a></li><li><label><a rel="external" href="https://gnusocial.jp/attachment/22149">Same oscilloscope trace with cursor measurement of time interval between the instant at which the surge voltage rises to 0,5 of its peak value, and then falls to 0,5 of its peak value. Duration is 18.00 μs.</a></label><br><a href="https://cybre.ams3.digitaloceanspaces.com/media_attachments/files/108/719/790/052/332/815/original/d759dada4544a1ea.png" rel="external">https://cybre.ams3.digitaloceanspaces.com/media_attachments/files/108/719/790/052/332/815/original/d759dada4544a1ea.png</a></li></ol></footer></blockquote>

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niconiconi (niconiconi@cybre.space)'s status on Sunday, 07-Aug-2022 16:25:09 JST niconiconi
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Success, the output waveform of my 8/20 μs impulse generator prototype is now IEC 61000-4-5 compliant!
Peak current: 200 A
Front time: 7.05 μs
Duration: 21.24 μs #electronics
In conversationSunday, 07-Aug-2022 16:25:09 JST from cybre.spacepermalink
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