Model 2701 User’s Manual Basic DMM Operation 3-37
4-wire RTDs
For 4-wire RTDs, the temperature measurement range is -200°C to 630°C (0.01°C
resolution). RTD types that are supported include D100, F100, PT385, and PT3916. A
USER type is available to modify RTD parameters, such as the resistance at 0°C. The
USER type can be enabled from the front panel, but the settings can only be changed using
remote programming.
The RTD has a metal construction (typically platinum). The resistance of the RTD
changes with changes in temperature. The Model 2701 measures the resistance and
calculates the temperature reading. When using default RTD parameters, the resistance of
the RTD will be 100Ω at 0°C.
Of all the temperature transducers, the RTD exhibits the most stability and linearity. The
Model 2701 performs the 4-wire measurement using offset compensated ohms. This
provides the most accurate way to measure the low resistance of the RTD.
NOTE The equations used by the Model 2701 to calculate the temperature vs.
resistance readings listed in the RTD reference tables are provided in
Appendix F.
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