The PH220 series of 200-W high-voltage power supplies comes housed in a standard 3U-high rack-mount chassis or bench units. These devices exhibit very low noise and high-precision output characteristics, needed for MRI scanners and other systems with multiple photomultiplier tube (PMT) devices. The first released model in the series is rated for an output voltage of 1500 V dc, with a broad range of output voltages from 100 V to higher than 5000 V possible. Either positive or negative output polarity can be factory-selected. Remote control includes voltage and current mode programming, enable input, and monitor outputs with better than 0.01% line, load, stability, and noise performance. Higher precision is optional. The supplies meet IEC 601 safety requirements. Prices start at $2980.