High precision integrator for use with Rogowski coils - has RC integrator followed by integrating operational amplifier including amplitude corrector

摘要

The high precision integrating circuit is esp. for use with Rogowski coils in current measuring equipment. the circuit accepts variable amplitude and frequency inputs and has minimal phase error. The Rogowski coil directly feeds an RC integrator followed by an integrating operational amplifier which includes amplitude corrector. This feeds a differentiating operational amplifier with phase correction, the time constants of both amplifiers being the same. In the absence of an input the first amplifier is provided with feedback by an electronic switch operating quasi-instanteneously within one secondof an input appearing.