A proportional conversion circuit and method for improving linearity of platinum resistance measurement

By introducing a voltage proportional adjustment module and a high-precision ADC circuit into the DC platinum resistance thermometer, combined with the automatic adjustment of the digital controller, the problem of insufficient linearity in platinum resistance measurement was solved, achieving higher measurement accuracy and system stability.

CN122149669APending Publication Date: 2026-06-05BEIJING AEROSPACE INST FOR METROLOGY & MEASUREMENT TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
BEIJING AEROSPACE INST FOR METROLOGY & MEASUREMENT TECH
Filing Date
2025-11-14
Publication Date
2026-06-05

AI Technical Summary

Technical Problem

Existing DC platinum resistance thermometers are unable to meet the technical requirement of 0.0001% in terms of measurement linearity, and traditional resistance measurement methods cannot meet the high-precision requirements.

Method used

It employs a dual-channel voltage proportional adjustment module and a high-precision ADC circuit. The voltage of the reference resistor and the platinum resistance under test is adjusted to the set range through the pre-voltage proportional adjustment, and the proportional coefficient is automatically adjusted by the digital controller to realize a measurement process that combines coarse adjustment and fine measurement.

Benefits of technology

This improves the linearity and accuracy of platinum resistance measurement, reduces the stringent requirements on ADC linearity, enhances the stability and adaptability of the measurement system, and ensures the reliability and accuracy of the measurement.

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Abstract

The application discloses a proportional conversion circuit and method for improving linearity of platinum resistance measurement, and belongs to the technical field of precision testing; the circuit comprises two voltage proportional adjustment modules, two high-precision ADC circuits and a reference source circuit; the voltage proportional adjustment modules are used for pre-adjusting the voltages at both ends of a reference resistance and a measured platinum resistance to a similar level, and then high-precision ADC sampling is carried out, so that the combination of "coarse adjustment" and "fine measurement" is realized. The application effectively reduces the stringent requirement on the linearity of the ADC itself, significantly improves the resistance ratio measurement precision and linearity in the full range under the same hardware performance, and solves the key technical problem in high-precision measurement of a direct-current platinum resistance temperature measuring instrument.
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