研究目的
To describe a calibration technique for a commercial Analog-to-Digital Converter (ADC) board using Thermal Voltage Converters (TVCs) up to 1 MHz with various sampling rates.
研究成果
The AC voltage error has been calibrated using a TVC as a reference standard by performing an AC-DC transfer difference measurement and DC voltage measurement. The estimated expanded uncertainty was less than 70 μV for 0.5 Vrms in 1-V range for all sampling rates tested. It is found that the uncertainty was not affected much by the resolution or sampling rate of the ADC board in 1-V range because the dominant uncertainty contributions came from the stability of the ADC and the temperature.
研究不足
The large Vaerr in higher frequencies are due to the digital filter of the ADC. The resolution or sampling rate of the ADC board in 1-V range does not affect the uncertainty much because the dominant uncertainty contributions came from the stability of the ADC and the temperature.
1：Experimental Design and Method Selection:
The calibration procedure was divided into two parts; DC and AC-DC transfer difference calibration. The NI-5922 board was calibrated at Vnom in DC by using DC calibration method to obtain Vderr. Then, the δADC of the NI-5922 board was measured by comparing with a reference TVC. The Vaerr is calculated from the results of both measurements by applying (1).
2：1).
Sample Selection and Data Sources:
2. Sample Selection and Data Sources: The AC voltage error (Vaerr) of the ADC board was described and calculated using DC voltage error, nominal voltage, and AC-DC transfer difference of the NI-5922 board.
3：List of Experimental Equipment and Materials:
NI-5922 board, Thermal Voltage Converters (TVCs), Arbitrary Waveform Generator (AWG), system controller.
4：Experimental Procedures and Operational Workflow:
The setup for the measurement of δADC of the board is a typical setup for transfer difference measurement except the synchronization of the calibrator and the ADC board with an AWG. The system controller fetches the readings from the board and calculates the Root-Mean-Square (RMS) value via Fast Fourier Transform (FFT).
5：Data Analysis Methods:
The AC voltage error was calculated by using both calibration results. The estimated expanded uncertainty of the AC voltage error for 0.5 Vrms was less than 70 μV in 1-V range of the ADC for all sampling rates.
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