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35 lines
2.5 KiB
Markdown
35 lines
2.5 KiB
Markdown
# FR-1 Trace lengths
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## The experiment
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For the experiment, I used FR-1 that has a thickness of 35µm. On there I will mill 4 trace sizes (0.4 mm, 0,6 mm, 0,8 mm and 1 mm) and they all have the same length of 7.5 cm’s. The traces are seperated by 1 Cm.
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In this experiment I will measure the temperature of the traces with a multimeter and a thermal laser. I will also watch the board closely for any damage. Since it is FR-1 I expect it to shows signs of damage under heat
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## Results
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the power. So I grabbed an old robot with 4 stepper motors attached but I could not get them to draw more than 30 watts. So that is why the maximum in this test is 30 watts. I also had a hard time finding a way to measure the temperature of the traces because we only had a heat gun here and the laser was not the place it was actually measuring. So 0,4 mm is not measured properly.
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| Trace Width Trace | Resistance | Maximum safe wattage | Burn out wattage |
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| :---------------- | ---------- | -------------------- | ---------------- |
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| 0,4mm | 3,1Ω | 15 | 20 |
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| 0,6mm 2 | 2Ω | 22 | 26 |
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| 0,8mm | 2Ω | 27 | ?? |
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| 1mm | 1,85Ω | ?? | ?? |
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* The 0,4 mm trace was the first one I tested. I started with 15 watts and it was stable at 23.8 degrees. After that I increased the wattage to 20 watts and the trace instantly exploded and burned so I could not get temperature readings there.
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* The 0,6 mm trace it held up well up to 27 watts where it started getting burn marks within a 5-10 seconds. The temperature rose to 45 degrees celsius. At 29 watts the pcb burned out at 68 degrees celsius.
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* When testing the 0,8 mm trace I hit a roof with how much power I could consume with the robot. I could only get up to 30 watts and I did not manage to break the trace. The maximum I found before it started discoloring was 24 watts at 54 degrees celsius. This was measured after it was left on for 2 minutes.
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* I could not get to the 1mm trace because the robot could not draw more than 30 watts. So thats why these are not filled in the table.
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## Recommendations for next time
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Make bigger pads to hookup the power easier to the pcb and maybe remove all the excess copper but that takes a super long time.
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## Files
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* [KiCad](TraceThicknesTest.zip) |