研究目的
To introduce a more accurate and precise standard for voltages higher than 0.5 V by modifying the multipliers resistors of the thermal voltage converters (TVCs).
研究成果
The modified multiplier resistor design provides a more accurate and precise standard for voltages higher than 0.5 V, with lower ac-dc differences and Type A uncertainty compared to traditional TVCs. The radial construction reduces inductance and skin effect, offering a satisfactory behavior for the modified design.
研究不足
The study focuses on voltages higher than 0.5 V and frequencies up to 1 MHz. The modified design aims to reduce errors such as skin effect and inductance error but may not eliminate all types of errors at higher frequencies.
1：Experimental Design and Method Selection
The MMR is built from ten non inductive with good stability metal-film resistors connected in series in a radial form to cover the ac voltage range 5 V.
2：Sample Selection and Data Sources
The modified TVC with value 5 V is automatically calibrated against another 5 V standard TVC to determine their ac-dc transfer differences at different frequencies.
3：List of Experimental Equipment and Materials
Calibrator Fluke model 5720A, high-accuracy digital multimeters Fluke model 8508A.
4：Experimental Procedures and Operational Workflow
The TVC is calibrated at frequencies 20 Hz, 55 Hz, 1 kHz, 10 kHz, 100 kHz, and 1 MHz. The output emfs from the two TVCs are measured at two high-accuracy digital multimeters.
5：Data Analysis Methods
The ac-dc differences for the various voltages at the different frequencies are calculated. Each calibration is repeated 20 times to obtain its Type A uncertainty.
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