Worked example
No result for these values. The message above the form says which field to change.
Lead-resistance error, magnitude
°C
- Uncompensated resistance in the model
- 0.1 Ω
- Ideal lead compensation
- Only equal lead resistances cancel
Three-wire mismatch is shown as a magnitude; which lead is higher determines whether the reading shifts high or low. Add other uncertainty separately.
Underlined figures are rounded. Select one to copy its full value.
Method and assumptions
Formula
2-wire error ≈ 2Rlead ÷ sensitivity; 3-wire residual ≈ lead mismatch ÷ sensitivity; ideal 4-wire lead error ≈ 0This is a local linear estimate around the entered operating point; use the actual sensitivity of the RTD curve there.
Limits of this result
- Three-wire cancellation assumes the relevant lead resistances are equal; the entered mismatch is the uncompensated difference.
- Four-wire selection removes ideal lead resistance from this estimate, not instrument offset, leakage or thermoelectric effects.
- Add sensor tolerance, transmitter accuracy, self-heating and thermal-installation errors separately.
Technical sources
Put the value to work
Read the related engineering guidance, or carry this task into System Builder to identify the signal path and EpiSensor products.