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This paper described one differential measurement method by using a lock-in amplifier as null detector, which can directly compare one high-purity sinusoidal [HPS] produced by a commercial precision calibrator with one stepwise-approximated sine wave [SASW] generated by programmable Josephson voltage standard [PJVS] in fundamental root-mean-square [FRMS] values at NIM. The preliminary results show...
The fundamental of digital–analog conversion (DAC) stepwise-approximated sine waves (SASW) is calculable based on the amplitude of each step. Using direct comparison method in specific frequency, the fundamental of DAC SASW can be used as ac voltage reference. A normal commercial DAC-based ac voltage system for direct fundamental comparison using lock-in amplifier is constructed to demonstrate the...
The performance characteristics of the staircase waveform of a DAC entitled as “DAC aliasing effect” are analyzed and reviewed. Its applications in precise measurements in voltage and power are further proposed using the fundamental comparison.
By using directly comparison method, the fundamental of DAC stepwise signal can be used as calculable AC voltage reference. A directly fundamental comparison system based on a normal commercial DAC is constructed to demonstrate the practicability of this method. The effects of the DAC quantization and the transients between adjacent steps affecting its fundamental wave are also studied.
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