engleski

The AC Amplitude and Channel Characterization of High-resolution Digitizers

High-resolution (24-bit) ADC based sampling devices e.g. NI PXI 5922 and NI PXI 4461 are usually used for precise electric power measurement purpose so it is required to characterize them in a proper way. According to that, several measurement techniques are proposed to characterize ac amplitude and channel characteristics at the maximum frequency of up to 100 kHz. An automated test and calibration system based on a planar multijunction thermal voltage converter and a modular electronic instrumentation platform has been developed. Furthermore, two ADCs, i.e. NI PXI 5922 and NI PXI 4461 have been compared with reference standard (Swerlein algorithm) to investigate their precision in RMS amplitude measurement of ac signals. In addition, this paper presents the PXI digitizers’ channel characterization in both sinusoidal and non- sinusoidal regime as the main contribution which results in comprehensive insight into digitizers’ performances and their mutual comparison. Accordingly, relevant uncertainty analysis is presented as well.

High-resolution oscilloscope ; Thermal voltage converter ; Phase angle error ; Complex voltage ratio ; Channel characterization

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