Overview

The high precision Current Comparators (current transformers) are used to convert high currents to a lower, measureable level. The errors of conventional standard current transformers inevitably depend on their burden. A magnetic flux in the core produces the e.m.f. which sustains the secondary current in the burden. This disadvantage has been eliminated by the development of the new current comparators. An indicator winding measures the magnetic flux in the core, while an amplifier - by regulating the current in a compensating winding - ensures that the amplitude of the residual flux in the core is approximately zero. With this technique, the high precision Current Comparators will maintain typical current ratio errors below 20 ppm and current phase errors below 0.15 min on a long term basis over an extremely broad current range. This electronically controlled current transformer is specifically designed for current range extension in capacitance measurements. It has divider measurements of 1:10 and 1:100.

Features