A new method improving precision of the phase difference measurement performed by two Keysight 3458A multimeters is proposed. The method is based on external synchronization of the multimeters by a specially selected sampling interval reducing the effect of the finite resolution of an internal time base (jitter) on the performance of the multimeters. By using this method, precision of the phase difference estimation in the audio frequency band can significantly be improved as compared with the commonly used synchronization schemes.
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Pokatilov et al. (2016) studied this question.
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