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NIST Sampling System for Accurate AC Waveform Parameter Measurements

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1 Author(s)
Bergman, D.I. ; Quantum Electr. Metrol. Div., National Inst. of Stand. & Technol., Gaithersburg , MD

This paper summarizes efforts at the National Institute of Standards and Technology (NIST) to develop a waveform sampling and digitizing system with accuracy comparable to that of an ac-dc thermal transfer standard for ac voltage measurements over the frequency range of 10 Hz to 1 MHz. In the frequency range from 1 kHz to 1 MHz, the sampler's gain flatness is better than that available from the best commercial digital multimeter. In ac-ac comparisons referenced to 1 kHz, the system agrees with a NIST-calibrated thermal transfer standard to within 17 muV/V from 20 Hz to 100 kHz for measurements made at both 1 and 0.1 V. The sampler's excellent dynamic linearity and flat input impedance are also discussed

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Instrumentation and Measurement, IEEE Transactions on  (Volume:56 ,  Issue: 2 )