This study evaluates the traceability, precision, and accuracy of the CN0565 evaluation board by Analog Devices, which integrates injection, measurement, multiplexing, and processing stages within a single device for bioimpedance applications. Bioimpedance measurements were conducted across a range of frequencies (5 kHz to 75 kHz) on commercially available resistors, and the results were compared against those from the AD5933EBZ board, which served as the gold standard. Python-based routines were employed for high-level control of the CN0565 through the ADICUP3029 controller board. However, the measurement setup was impacted by communication errors, requiring reset procedures and revealing limitations in memory handling. The CN0565 board demonstrated considerable variability in accuracy and precision, with an error dependency on the calibration resistor set to 1 kΩ, limiting its dynamic measurement range and increasing the coefficient of variation across all tested frequencies. This dependency is likely due to the restricted parameter configuration within the manufacturer’s Python interface. The findings indicate the potential need for low-level programming to expand the CN0565’s measurement capabilities for more accurate bioimpedance analyses.

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CN0565 – Multichannel Bipolar Impedancemeter Evaluation

  • Antonio H. Dell’Osa,
  • Gerardo Ames Lastra

摘要

This study evaluates the traceability, precision, and accuracy of the CN0565 evaluation board by Analog Devices, which integrates injection, measurement, multiplexing, and processing stages within a single device for bioimpedance applications. Bioimpedance measurements were conducted across a range of frequencies (5 kHz to 75 kHz) on commercially available resistors, and the results were compared against those from the AD5933EBZ board, which served as the gold standard. Python-based routines were employed for high-level control of the CN0565 through the ADICUP3029 controller board. However, the measurement setup was impacted by communication errors, requiring reset procedures and revealing limitations in memory handling. The CN0565 board demonstrated considerable variability in accuracy and precision, with an error dependency on the calibration resistor set to 1 kΩ, limiting its dynamic measurement range and increasing the coefficient of variation across all tested frequencies. This dependency is likely due to the restricted parameter configuration within the manufacturer’s Python interface. The findings indicate the potential need for low-level programming to expand the CN0565’s measurement capabilities for more accurate bioimpedance analyses.