Evaluation of 100 A, 100 kHz transconductance amplifiers

20A trapezoidal reference current pulse generator for the evaluation of current transducers

“…The effect of thermal dynamics and power coefficient [1] are also a concern as it is difficult to estimate their impact for a pulsed application with such small duty cycles. A market survey of pulsed current sources concluded that none were available or completely satisfactory; the 100 A, 100 kHz transconductance amplifier based on NIST design [2], [3], which was also considered, has, indeed, an estimated temperature coefficient as high as 5 ppm / • C. As a consequence, a project was launched to develop this pulsed calibrator which also envisages a future use in faster applications. This development uses ratiometric techniques based on commercial low-cost thin film resistor arrays, succesfully utilised by CERN and METRON, to amplify and then pulse a well-known, accurate DC current [4].…”

Power electronic converter for characterization of hall-effect current sensors

“…Successful attempt was made in [3] to produce stable and accurate 100A dc current source in the frequency range from 0.1Hz to 1kHz using computer controlled commercial equipment in conjunction with software-controlled digitizing voltmeter. It was further used in [4] to validate the performance of the set-up developed in the laboratory.…”