Phase controlled accurate voltage divider creates two coherent AC voltages with calculated magnitude ratio using additional voltages with calculated phase control. Ratio of these voltages is calculated theoretically with high accuracy. Digital-to-analog converters (DAC) are used to create AC additional voltages. Because of it the discreteness of the phase controlled voltage divider is equal to DACs digit divided on two. Modern DAC, depend on their operation speed, usually have 6-16 digits. Consequently, the discreteness of the relative magnitude phase control lies in the range of 3 × 10–2 –3 × 10–5. Discreteness of the DAC phase control only slightly infl uence on the accuracy of the magnitude phase control, so that only discreteness of DAC infl uences on the accuracy of measurement by phase controlled dividers. Report describes the methods of the discreteness uncertainty reduction in voltage dividers with phase control. Two methods of the discreteness uncertainty reduction are discussed. First one use phase controlled dividers only. Other one use mixed both phase and magnitude control. The discreteness uncertainty of both methods is investigated. Possibility of the crea tion of the phase controlled divider with diff erent control low are discussed and analyzed. Decade calibration in both cases is developed and researched.

Рассматривается новый метод построения мостов переменного тока, в которых используются делители напряжения с фазовым управлением, основанные на синтезе сигнала с регулируемой амплитудой посредством суммирования сигналов с регулируемой фазой. The new method of building of AC bridges, in which phase-controlled voltage dividers are used, based on the synthesis of a signal with a controlled amplitude by summing signals with a controlled phase.