A Basic Guide to RTD Measurements by Joseph Wu 2026-11-05
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Section 2.1.3, printed pp. 10–11, shows the shared-current reference resistor and explains reference accuracy, lead resistance and sensor self-heating.
Additional cited passages: §2.1.4, printed p. 11, equations (17)–(18), digital conversion proportional to gain times the sensor/reference resistance ratio; §2.1.3, printed p. 11, the Kelvin connection at the reference terminals excludes series connection resistance from the measured reference potential difference. [ref]
Additional cited passages: §§1.4.1–1.4.2, printed pp. 5–6, Figures 1-5–1-6 and equations (6)–(12), three-wire lead-resistance cancellation and swapping the two excitation sources to reduce mismatch. The averaging rule is specific to that circuit topology. [ref]
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