Ruckus1631

Yep both connected to the PC, 2 ports directly next to each other. Also correct, just the MTE leads. The next day I did try connecting the differential reference lead to the input lead with nothing else connected and still getting the 30V spikes. Also, if I am remembering correctly, there used to be a clicking sound when starting the scope, like mechanical relays. I no longer hear that when starting the scope instrument. I will try connecting the AWG to the scope input in the morning. Update: I just tried on another PC, and it worked, so I switched back to the original PC, and still had the same issue. I then switched to the USB 3.0 port, and it worked fine in that port. Switched back to the original port and the issue returned. Not sure if it's the data rate, or a power issue, but for now everything is working on the USB 3.0 port. Thanks for the help!

On my AD3, I am getting 100Hz +/-30V pulses with both channels floating. I am measuring the output of a CAN transceiver, and all devices are being powered over USB. I only measure 40mV of difference between USB-C cable ground of the AD3 and the development board ground. This is the first time I am using the oscilloscope of the AD3, but before I connected it to the circuit I did turn it on and it was reading 0V as expected. After connecting to CAN xcvr, it will no longer read 0V even when floating. The logic analyzer still works correctly when connected to the microcontroller Tx/Rx pins, so it seems like the O-scope is the only instrument not working correctly. Can you recommend any troubleshooting tips, or should I send in for an RMA? Thank you!