These high voltage power supplies are utilized in a number of applications including Photomultiplier, Ink Jet Printers, Electrostatic Precipitation, Geiger Muller Tubes, Scientific Instruments, Bomb Detectors, Chemical Detection and Electron Beam applications. These high voltage power supply modules are designed for for direct PCB mounting with a low profile and small footprint. Line, load and ripple performance, together with many other aspects of the specification, are all you would expect from this professional photomultiplier module and, due to the wide input range of 21V to 27V DC, the unit can be used with various types of DC input supplies. Positive or negative polarity models are available.