high-voltage source consisting of a limited number of step-up transformers with their secondaries in series, the primary of each after the first being supplied from a pair of taps on the secondary of the preceding, kõrgepingemõõtetrafo, mis koosneb piiratud arvust astmelistest trafodest, mille sekundaarmähised on seerias, millest igaüks on esmane pärast seda, kui esimene on kasutusel eelmisest paarist sekundaarmähisega