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Here are some tips to troubleshoot common issues with the magnetometer array.
=4.5 Hz "square wave"
This probably means the Tristan SQUID was left powered on. That control box is in the setup room on the floor next to the BTi electronics rack. There's a simple on/off switch next to the power cord socket. Make sure to check with one of the SQUID people (Sarah or Bill, most likely) that it's OK to turn it off. Then hit the switch and unplug it for good measure.
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