Uploaded February 2017 | Updated September 2026, 1 week ago
When it comes to choosing a fuse for a specific application most people only take care of the right current- ad voltage-rating of the fuse.
Support Roger on Patreon: patreon.com/kainkalabs
But what about the inrush-current? Does your fuse resist the inrush-current and is a quick-acting (fast-blow) or a time-lag (slow-blow) fuse better?
The answer lies in a not well-known characteristic of fuses called the "Melting Integral" or "I2T-Value" (I-squared-t value)?
What is it and how you get the right fuse-rating by either simulating or measuring the inrush-current?
Roger explains all in detail with a practical example and shows some tricks with LTSpice and how to measure the inrush-current in a real-life circuit.
For further explanation of the used RMS-current definition:
youtu.be/LZEie3nAo1E
and RMS-power:
youtu.be/UGfLMHTpPCY
When it comes to choosing a fuse for a specific application most people only take care of the right current- ad voltage-rating of the fuse.
Support Roger on Patreon: patreon.com/kainkalabs
But what about the inrush-current? Does your fuse resist the inrush-current and is a quick-acting (fast-blow) or a time-lag (slow-blow) fuse better?
The answer lies in a not well-known characteristic of fuses called the "Melting Integral" or "I2T-Value" (I-squared-t value)?
What is it and how you get the right fuse-rating by either simulating or measuring the inrush-current?
Roger explains all in detail with a practical example and shows some tricks with LTSpice and how to measure the inrush-current in a real-life circuit.
For further explanation of the used RMS-current definition:
youtu.be/LZEie3nAo1E
and RMS-power:
youtu.be/UGfLMHTpPCY
![Every maker should have…[Pt.25]…an IR Thermometer](https://i.ytimg.com/vi/wol957PJScQ/mqdefault.jpg "Every maker should have…[Pt.25]…an IR Thermometer
The poor-man´s Infrared Imaging-Camera :-)
Roger explains how an electronic Infrared-Thermometer (or Pyrometer) works and what traps there are when taking measurements with them.
Why is a high Spot-to-Distance ratio of the IR-lens important?
What is the optical parallax of the laser-pointer?
What is the emissivity-factor and when can it give false measurements?
Shop: http://www.ak-modul-bus.de/stat/laborzubehoer.html
Forum-Thread: https://forum.kainkalabs.com/forumdisplay.php?fid=13
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