The photomultiplier high voltage supply is capable of supplying a high voltage ranging from 1500 volts to 2500 volts against the load of 20 megohm with magnitude of ripples being at a prescribed Ievel on the high voltage, where the load is a breeder of the photomultiplier.
Magnitude of the ripples is proportional to the amount of the load current.
The ripples limit the load current to the photomultiplier.