Abstract
A new calibration method for RTD-based temperature instrument is introduced. The precision resistance is generated using digital-controlled relays to switch a precision resistance network which is similar to the resistance box. We also present a new switch algorithm to reduce the influence of initial error of the precision resistors. The resistance of the precision resistance generator varies from 80.00ohms to 260.00ohms with a 4-wire output interface. It is convenient that using this precision resistance generator to test the nonlinear of temperature transmitters based on Pt100. Our test shows that the generator can provide a precision resistance with an uncertainty of less than ±0.02ohms.
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