研究目的
To describe the calibration of resistive voltage dividers based on the step-up method and a comparison system using two Keysight-3458 digital multimeters for measuring electric power up to 100 kHz.
研究成果
A step-up method based on two 3458 DMMs to calibrate the ratio and phase errors of a set of voltage dividers up to 50 kHz was described. An inductive 2:1 ratio standard was constructed to validate the measuring system. Preliminary results showed differences lower than 10×10-6 in ratio and 2 μrad/kHz in phase.
研究不足
Near 50 kHz, the amplitude and phase errors are large, but in ratio measurements, most of these factors cancel. The method requires linear behavior of the dividers, with temperature dependence and dielectric losses being the main sources of departures from linearity.
1：Experimental Design and Method Selection:
The step-up method was used for calibration, comparing two adjacent dividers with a ratio of 2:
2：Sample Selection and Data Sources:
Resistive voltage dividers with voltage ranges from 4 V to 1024 V were used.
3：List of Experimental Equipment and Materials:
Two Keysight-3458 DMMs, a function generator driven by a rubidium clock, and Vishay naked Z-foil resistors were utilized.
4：Experimental Procedures and Operational Workflow:
The DMMs were synchronized in parallel, and a program reconstructed the digitized signals using Interpolated Fast Fourier Transform techniques.
5：Data Analysis Methods:
Amplitude ratio and phase difference were analyzed, with corrections for error factors such as linearity and resolution.
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