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Voltage and current measurements using a standard voltmeter and ammeter alter the circuit being measured either by drawing or resisting the current flow, which introduces uncertainties in the measurements. Null measurements balance the voltages so that no current flows through the measuring device and, therefore, no alterations occur in the measured circuit.
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Dynamic Zero Current Method to Reduce Measurement Error in Low Value Resistive Sensor Array for Wearable Electronics.

Huanqian Zhang1,2,3, Jee Chin Teoh1, Jianfeng Wu4

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Summary
This summary is machine-generated.

This study introduces the dynamic zero current method (DZCM) to reduce measurement errors in low-value resistive sensor arrays (RSAs). DZCM significantly outperforms the zero potential method (ZPM), especially for wearable electronics.

Keywords:
dynamical zero currentinput offset voltagelow value resistive sensor arraymeasurement errorparasitic resistancezero potential method

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Area of Science:

  • Electrical Engineering
  • Sensor Technology
  • Wearable Electronics

Background:

  • Resistive sensor arrays (RSAs) offer reduced wiring complexity for wearable systems.
  • Crosstalk current in RSAs causes significant measurement errors, particularly in low-resistance (<100 Ω) applications.
  • Existing solutions primarily address high-resistance RSAs, leaving a gap in low-resistance error mitigation.

Purpose of the Study:

  • To introduce and evaluate a novel circuit design, the dynamic zero current method (DZCM).
  • To decrease measurement errors in low-value resistive sensor arrays.
  • To address the limitations of existing methods for RSAs below 100 Ω.

Main Methods:

  • Implementation of the dynamic zero current method (DZCM) circuit design.
  • Testing with low-value resistive sensor arrays using ideal resistors.
  • Comparison of DZCM performance against the zero potential method (ZPM).

Main Results:

  • DZCM demonstrated lower measurement error compared to ZPM in low-value RSA tests.
  • DZCM showed a significantly lower error variation ratio due to amplifier offset voltage: 4%/mV (row) to 7%/mV (column).
  • ZPM exhibited a much higher ratio (25%/mV row to 45%/mV column), which increased with array size.

Conclusions:

  • The dynamic zero current method (DZCM) is an effective solution for reducing measurement errors in low-value resistive sensor arrays.
  • DZCM offers superior performance over the zero potential method (ZPM), particularly in mitigating amplifier offset voltage effects.
  • This method holds promise for improving the accuracy and reliability of wearable electronic systems utilizing RSAs.