Electronics > Beginners
Probing usb powered circuit. Should I be scared?
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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