Precision current monitor system for the power supplies at SRRC

At SRRC, a precision output current monitoring system is installed to monitor the output performance of all the booster/storage ring power supplies. Accurate DC current transformers (DCCTs) are attached to the output terminal of every power supply system. Each transformer's gain/offset are carefully calibrated against high precision current source and approximated using high-order polynomial curve fitting. The output of each DCCT is connected to multi-channels data logger for real-time data collection, the collected data are calibrated using the interpolated DCCT gain/offset value. A PC station is set up to serve as host to store the current output for real-time monitoring. This monitoring system provide a precise real-time database for rapid fault diagnosing whenever there is malfunction of the beam operation.