KOPPLINGSANORDNING FOR UPPMETNING AV EMISSIONSSTROMMAR I RONTGENROR MED NOLLPOTENTIALDIFFERENS

摘要

The invention describes a simple circuit arrangement for measuring the emission currents of X-ray tubes with zero potential difference. The negative high voltage is applied to the cathode via a primary winding of a current transformer which via diodes is connected in parallel with the filament. The filament alternating voltage renders the diodes alternately conductive and non-conductive, so that the tube current flows in alternate directions through the current transformer. This enables an alternating-current signal which is proportional to the emission (direct) current to be derived from the secondary.