1.6 KiB
FR-1 Trace lengths
The experiment
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.
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
Results
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.
| Trace Width Trace | Resistance | Maximum safe wattage | Burn out wattage |
|---|---|---|---|
| 0,4mm | 3,1Ω | 15 | 20 |
| 0,6mm 2 | 2Ω | 22 | 26 |
| 0,8mm | 2Ω | 27 | ?? |
| 1mm | 1,85Ω | ?? | ?? |
Recommendations for next time
Make bigger pads to hookup the power easier to the pcb.
