J. Nissila, K. Ojasalo, M. Kampik, J. Kaasalainen, V. Maisi, M. Casserly, F. Overney, A. Christensen, L. Callegaro, V. D’Elia, N. T. M. Tran, F. Pourdanesh, M. Ortolano, D. Kim, J. Penttila, L. Roschier
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A precise two-channel digitally synthesized AC voltage source for impedance metrology
A two-channel AC voltage source based on digital synthesis is reported. We present measurement results of some of the key properties at 1 kHz with applications like digital impedance bridges in mind. Measurements show that amplitude ratio of the channels has a stability (Allan standard deviation) of one part in 108 for a 30 min measurement. The phase difference between the channels is also stable within 0.1 μrad.
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