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<!doctype html><html lang=en><head><title>Testing the Upgrade of the UV Exposure Unit :: Privacynerd's blog</title><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=description content="So, what about the exposure time? As part of a project that had been on the to-do list for quite some time and has now been tackled (see the following article), the exposure unit was put to use. However, since no exposure series had been performed with it after the upgrade to 96 LEDs (a doubling of the number), it was now time to do so.
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"><meta property="og:url" content="https://blog.privacynerd.de/en/posts/2026/09/exposure-unit-upgrade-test/"><meta property="og:site_name" content="Privacynerd's blog"><meta property="og:image" content="https://blog.privacynerd.de/en/posts/2026/09/exposure-unit-upgrade-test/cover.jpg"><meta property="og:image:width" content="1200"><meta property="og:image:height" content="627"><meta property="article:published_time" content="2026-09-09 20:12:00 +0200 CEST"><style>#banner{width:100%;height:2rem;display:grid;grid-template-columns:1fr auto;background:var(--accent)}#banner span{display:flex;align-items:center;justify-content:center}#banner a{color:var(--background);display:inline}#banner>button{padding:0 5px 0 0;margin:0}</style><div id=banner><span><a href=https://git.privacynerd.de/git.privacynerd.de/blog.privacynerd.de>Construction site 🚧 | Work in progress</a></span></div></head><body><div class="container center"><header class=header><div class=header__inner><div class=header__logo><a href=/en><div class=logo>Privacynerd's blog</div></a></div><ul class="menu menu--mobile"><li class=menu__trigger>Menu ▾</li><li><ul class=menu__dropdown><li><a href=/en/about>About</a></li><li><a href=/en/tags>Tags</a></li><hr><li><b><a href=/en/posts/2026/09/exposure-unit-upgrade-test/>English</a></b></li><li><a href=/de/posts/2026/09/exposure-unit-upgrade-test/>Deutsch</a></li></ul></li></ul><ul class="menu menu--desktop menu--language-selector"><li class=menu__trigger>en ▾</li><li><ul class=menu__dropdown><li><b><a href=/en/posts/2026/09/exposure-unit-upgrade-test/>English</a></b></li><li><a href=/de/posts/2026/09/exposure-unit-upgrade-test/>Deutsch</a></li></ul></li></ul></div><nav class=navigation-menu><ul class="navigation-menu__inner menu--desktop"><li><a href=/en/about>About</a></li><li><a href=/en/tags>Tags</a></li></ul></nav></header><div class=content><article class=post><h1 class=post-title><a href=https://blog.privacynerd.de/en/posts/2026/09/exposure-unit-upgrade-test/>Testing the Upgrade of the UV Exposure Unit</a></h1><div class=post-meta><time class=post-date>2026-09-09</time><span class=post-reading-time>3 minutes to read (295 words)</span></div><img src=/en/posts/2026/09/exposure-unit-upgrade-test/cover.jpg class=post-cover alt="Testing the Upgrade of the UV Exposure Unit" title="Cover Image"><div class=post-content><div><p>So, what about the exposure time? As part of a project that had been on the to-do list for quite some time and has now been tackled (see the following article), the exposure unit was put to use. However, since no exposure series had been performed with it after the <a href=https://blog.privacynerd.de/en/posts/2026/04/exposure-unit-upgrade/>upgrade to 96 LEDs (a doubling of the number)</a>, it was now time to do so.</p><p>The basis for this is a test board, which is divided into 5 sections and primarily contains conductive traces of various thicknesses.</p><p><img src=/en/posts/2026/09/exposure-unit-upgrade-test/pcb-design.png alt="The PCB Design"></p><p>The design was printed (unfortunately not mirrored ;) on two sheets of foil (using an inkjet printer) and glued with the printed side facing the photo-coated raw PCB, after which I proceeded to expose it. First, I exposed everything for 19 minutes, and then gradually covered the respective columns with aluminum foil. The following table shows the respective exposure times:</p><table><thead><tr><th>Column</th><th>Time [min]</th><th>Condition</th></tr></thead><tbody><tr><td>T0</td><td>19</td><td>very good</td></tr><tr><td>T1</td><td>20</td><td>very good</td></tr><tr><td>T2</td><td>21</td><td>good</td></tr><tr><td>T3</td><td>22</td><td>good</td></tr><tr><td>T4</td><td>23</td><td>good</td></tr></tbody></table><p>There are some visible breaks in certain places, such as next to the label <code>2.0mm</code>. However, this is due to the printout. The same reason explains why the conductor paths merge at the thinnest point.</p><p>The circuit board was then etched in 300g of sodium hydroxide solution (etchant: NaOH) at a ratio of 1:100. The etching time was a little over 10 minutes.</p><h2 id=conclusion>Conclusion<a href=#conclusion class=hanchor arialabel=Anchor>#</a></h2><p>So: the exposure time is 19-20 minutes, which is as expected - the time has been cut in half, from 42 minutes to a nice round 20 minutes!</p><p>In any case, for the next project (which will be the subject of an upcoming article), the exposure unit produced results with this setting that were - at least for me - truly satisfying.</p></div></div><div class=pagination><div class=pagination__title><span class=pagination__title-h>Read other posts</span><hr></div><div class=pagination__buttons><a href=https://blog.privacynerd.de/en/posts/2026/04/exposure-unit-upgrade/ class="button inline next">[<span class=button__text>Upgrading the UV Exposure Unit</span>] ></a></div></div></article></div><footer class=footer><style>.antidiscovery i{display:none}</style><div class=footer__inner><div class="copyright copyright--user"><span class=antidiscovery>© 2026 <i>L</i>B<i>P</i>e<i>o</i>n<i>i</i>j<i>n</i>a<i>c</i>m<i>G</i>i<i>N</i>n<i>U</i> <i>S</i>B<i>k</i>u<i>o</i>r<i>K</i>k<i>y</i>h<i>f</i>a<i>H</i>r<i>r</i>d<i>y</i>t</span>
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