Equation for 0 °C to 850 °C temperature range
RRTD = R0 (1 + AT + BT2)
where:
• R
RTD
is the calculated resistance of the RTD
• R
0
is the known RTD resistance at 0 °C
• T is the temperature in °C
• A = alpha [1 + (delta/100)]
• B = –1 (alpha)(delta)(1E-4)
The alpha and delta values are listed in the following table.
RTD parameters for equations
The RTD parameters for the Callendar-Van Dusen equations are listed in the following table.
DMM6500 resistance to temperature device (RTD)
Verify the simulated RTD temperature
Use the values in the tables following the steps below to verify the performance of the DMM6500.
Actual values depend on the published specifications (see Example reading limit calculation (on page
2-4)).
To verify RTD accuracy:
1. For 4-wire accuracy, connect the DMM6500 INPUT and SENSE terminals to the calibrator as
shown in the following figure.