| Electronics > Beginners |
| Probing usb powered circuit. Should I be scared? |
| (1/7) > >> |
| Moriambar:
Hi there. I've just been gifted my first oscilloscope, so I'm not an expert on anything in that respect. I have to troubleshoot a circuit which is powered through an arduino nano connected via usb to my mac. I was trying to use the ground pin as a reference for the probe, but then I saw this: https://youtu.be/xaELqAo4kkQ and now I'm scared... Should I remove the power from my laptop before probing and use just the batteries? Or is it safe to use the gnd of the arduino as a ref? Thanks |
| Kremmen:
OK to use the Arduino GND since the circuit is galvanically isolated from mains. |
| Moriambar:
--- Quote from: Kremmen on October 18, 2018, 01:35:55 pm ---OK to use the Arduino GND since the circuit is galvanically isolated from mains. --- End quote --- Oh ok, thanks. I did not know that the usbs/arduino are galvanically isolated. Cheers |
| glarsson:
You don't know if the USB supply is isolated. A small phone charger style USB power supply most likely is, but a USB connector on a stationary PC connected to a grounded power outlet probably isn't. Don't assume, meassures first. |
| Moriambar:
--- Quote from: glarsson on October 18, 2018, 01:46:10 pm ---You don't know if the USB supply is isolated. A small phone charger style USB power supply most likely is, but a USB connector on a stationary PC connected to a grounded power outlet probably isn't. Don't assume, meassures first. --- End quote --- Ok, I'll measure it! |
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