Superconducting magnets with long charge times require a power supply that will hold a constant voltage across a magnet during the charge, hold, and discharge periods. Conventional supplies regulate poorly during hold and lose control completely during discharge of the magnet. A simple circuit has been designed to connect between a magnet and the remote sense input of a conventional power supply which permits control and regulation at all times. During the testing of multisection superconducting magnets, it is desirable to know the order and approximate time interval in which each section undergoes a transition to the normal conducting state. A circuit has been designed which detects and displays this information.