The RQ1 will show positive (P) polarity. That was the polarity it was in just before I turned off the power. The 480VAC power to it is locked out, there is no current in the magnet. I went down to look at the LD1 NMR. EPICS was updating the readback, but the teslameter was not responding to any commands. After a bit of fooling around I cycled power on the teslameter. It took a little while for all the EPICS controls to be functional, but it eventually got there. The NMR was locked and responsive when I left the hall. I would suspect the teslameter is at fault for the lock up.