A New Device for the Calibration of Current at High Frequencies

A new device for calibrating current over wide frequency and dynamic ranges with sufficient accuracy is presented. The calibration of the ammeter under test can easily be made with secondary standards as the current monitors are calibrated by utilizing a thermocouple-type ammeter and a short-circuited-ring-type electrodynamic ammeter. The merit of this calibration method is that the magnitude of current passing through the ammeter under test can be equalized to that of the electrodynamic ammeter.