Four-Electrode Resistor Layout for Precise Resistance Measurement
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Solution Overview
Problem
Conventional resistor devices with two electrodes suffer from inaccurate resistance value measurements due to voltage drop, which affects precision, especially in high-precision applications, and existing four-wire methods still face interference issues with copper electrode resistance and temperature drift.
Innovation Solution
A resistor device with four electrodes, where two first electrodes and two second electrodes are symmetrically distributed on both sides of the resistor layer, ensuring equipotential connections on the same side, allowing for accurate voltage and current measurements without voltage drop, using voltmeter and ammeter connections in parallel and series respectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If two electrodes are used for both voltage and current detection, then the device structure is simple, but the measurement accuracy deteriorates due to voltage drop affecting both measurements
Solution Approach 1:
The single electrode is segmented into two separate electrodes: a current electrode for current detection and a voltage electrode for voltage detection. This segmentation allows the current and voltage measurement paths to be separated, eliminating the interference of voltage drop in the current path from the voltage measurement, thereby resolving the technical contradiction between simple structure and accurate measurement.
2Ease of operation
If conventional two-electrode voltammetry is used, then the measurement process is simple, but measurement accuracy deteriorates due to voltage drop in the detection path
Solution Approach 1:
The measurement function is segmented into two independent electrode pairs: one for current injection and one for voltage sensing. This maintains operational simplicity while dramatically improving accuracy, as the voltage measurement is now taken from a high-impedance node that does not load the circuit, eliminating the voltage drop error inherent in two-electrode measurements.
3Measurement precision
If four electrodes are used with separated current and voltage points, then measurement accuracy improves, but device complexity increases
Solution Approach 1:
The current electrode and voltage electrode are merged into a single integrated electrode assembly. The voltage electrode is positioned at the extreme end of the current electrode, combining both measurement functions into one physical structure. This merging reduces the number of separate components and simplifies the overall device structure while maintaining the measurement accuracy benefits of four-electrode configuration.
Data Source
AI summary
A resistor device has a resistor body, a first electrode assembly and a second electrode assembly. The resistor body has a resistor layer. The first electrode assembly has two first electrodes symmetrically distributed on both sides of the resistor layer, wherein the first electrodes are electrically connected to the resistor layer. The second electrode assembly has two second electrodes symmetrically distributed on both sides of the resistor layer, wherein the second electrodes are electrically connected to the resistor layer, and positions which the first electrode and the second electrode located on the same side of the resistor layer are connected to the resistor layer have an equipotential. The resistor device does not generate voltage drop through voltammetry detection, improves the accuracy of resistance value precision measurement of the voltammetry detection, and thus can be applied to precision circuits that have high requirements on resistance value precision.