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Flux-gate transmitters are widely used in magnetic field measurement and monitoring systems due to their high sensitivity and reliability. The measurements accuracy is significantly affected by the output waveform, which is determined by the flux-gate output circuit load parameters. In this work, full-scale experimental studies of an active-capacitive load effect on the shape and amplitude of the flux-gate transmitter output waveform under unipolar pulse excitation were performed. The experiments were conducted using differently designed flux-gate sensors with the active-capacitive load variation. Changes in the active-capacitive load parameters were found to lead to the aperiodic, critical, and oscillatory output waveforms modes formation. It was shown there is a load values range that provides the required waveform for further processing and digitizing. The obtained results have confirmed a justified selection of the flux-gate transmitter active-capacitive load under unipolar pulse excitation to improve output waveform quality and measurement accuracy.

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