{'fraction_non_alphanumeric': 0.014414414414414415, 'fraction_numerical': 0.007207207207207207, 'mean_word_length': 5.421965317919075, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
Precision AC Current Measurement Technique

Abstract: This paper describes a technique for precisely measuring AC currents using a new patent pending design for a current transformer. This technique has been implemented in a new laboratory power analyzer. Tests of the existing design have demonstrated Type A measurement uncertainties of less than 30 ppm (parts per million or parts in 106) for a field deployable instrument for both stationary and quasi-stationary AC current signals. Future modifications are being evaluated for implementation into a non-portable laboratory instrument with the goal of achieving measurement uncertainties of less than 10 ppm (k = 2). These measurement techniques are applicable to AC ammeters and power analyzers. The associated fast asynchronous sampling method and non-zero crossing calculations also materially improves the precision of both AC current and voltage measurements. In addition these techniques and the measurement circuitry can be adapted to provide the basis for determining phase shifts between currents and voltages in single and multiple phase systems.