2600A AC Transimpedance Amplifier

The model 2600A provides ultra-precise ratio division of AC currents. Based on current comparator technology, the 2600A is developed as a means of calibrating optical and non-conventional current transformers.

The 2600A has two input current ranges, 1 A and 5 A with multiple gain stages of 1, 2, 5, 10, 20, 50 & 100 for amplifying low current inputs while maintaining full range accuracy. The current comparator provides a means to automatically correct for magnitude and phase errors without requiring adjustment controls. Full-scale inputs for range 1 A & 5 A on gain 1 are 1 A & 5 A respectively. Full-scale inputs for range 1 A & 5 A on gain 100 are 10 mA & 50 mA respectively. The recommended calibration for the 2600A is 3 to 5 years.

The Transimpedance Amplifier is a current-to-voltage converter consisting of an input current transformer with a resistive shunt to obtain a voltage proportional to, and in-phase with the primary current. It provides ultra-precise ratio divisions of AC currents with accuracies to ≤ 20 ppm. The stability and accuracy of the transimpedance are determined by the basic accuracy of the input current transformer and current comparator.

Current extensions to 2000 Amps are available with Measurements International’s model 7020 Precision Current Transformer.

Block Diagram Including 7020 Extender

^{* At 50 or 60 Hz}