Note that I’ve been investigating a new issue when using the electrical stimulator in the MEG with EEG. The combination caused large noise in both EEG and MEG, mainly 120 Hz, even causing some MEG sensors to unlock or ramp.
So far, I’ve confirmed that the EEG ground equalizing system is working properly, and the issue occurs with both our stimulators so it’s very unlikely that they are both suddenly malfunctioning.
I will keep troubleshooting and update this thread when I have more information.