Fluke 744 Fluke 744 Users Manual - Page 47

Documenting Process Calibrator Using Measure Mode Using Resistance-Temperature Detectors (RTDs) The calibrator accepts RTD types shown in Table 6. RTDs are characterized by their resistance at 0 °C (32 °F), which is called the "ice point" or R0. The most common R0 is 100 Ω. Most RTDs come in a three-terminal configuration. The calibrator accepts RTD measurement inputs in two-, three-, or four-wire connections as shown in Figure 15. A four-wire configuration provides the highest measurement precision, and two-wire provides the lowest measurement precision. Table 6. RTD Types Accepted RTD Type Ice Point (R ) 0 Pt100 (3926) 100 Ω *Pt100 (385) 100 Ω Ni120 (672) 120 Ω Pt200 (385) 200 Ω Pt500 (385) 500 Ω Pt1000 (385) 1000 Ω Cu10 (427) 9.035 Ω ** Pt100 (3916) 100 Ω *Per IEC 751-Standard **10 Ω @ 25 °C Material Platinum Platinum Nickel Platinum Platinum Platinum Copper Platinum α 0.003926 Ω/°C 0.00385 Ω/°C 0.00672 Ω/°C 0.00385 Ω/°C 0.00385 Ω/°C 0.00385 Ω/°C 0.00427 Ω/°C 0.003916 Ω/°C Range (°C) -200 to 630 -200 to 800 -80 to 260 -200 to 630 -200 to 630 -200 to 630 -100 to 260 -200 to 630 37