The PM20D bench top power supply provides a stable well regulated output controllable from 20 V to 2000 V. It has been designed primarily for photomultipliers with the particular needs of the laboratory or research specialist in mind. The polarity is determined by selecting either the positive or negative output SHV socket mounted on the rear of the unit. The dual socket output guards against accidental polarity reversal. The unit offers additional safety features such as protection against overload, flashover and short circuit. Every unit is supplied with a set of mating connectors.