National Instruments Module SCXI-1503 Manuale Utente Scaricare il pdf (Pagina 37)

Chapter 4 Theory of Operation

defined as the change in RTD resistance from 0 to 100 °C, divided by the

resistance at 0 °C, divided by 100 °C:

where

100

is the resistance of the RTD at 100 °C.

is the resistance of the RTD at 0 °C.

For example, a 100 Ω platinum RTD with α = 0.003911 has a resistance of

139.11 Ω at 100 °C.

Figure 4-3 displays a typical resistance-temperature curve for a 100 Ω

platinum RTD.

Figure 4-3. Resistance-Temperature Curve for a 100 Ω Platinum RTD, α = 0.00385

α(Ω/Ω/°C)

100

–

100 °C×

-----------------------------=

480

400

320

240

160

320 400 480 560 640 720 800 8800 80 160 240 960

1 2 ... 32 33 34 35 36 37 38 39 40 41 42 ... 78 79

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National Instruments Module SCXI-1503 Manuale Utente Pagina 37