Linearized_platinum_RTD_signal_conditioner

Published:2009/7/24 2:32:00 Author:Jessie | From:SeekIC

Fig. 13-19 This circuit provides complete linearized signal conditioning for a platinum RTD (Rosemount 118MFRTD). To calibrate, substitute a precision decade box (General Radio 1432k) for Rp Set the box to the 0℃ value (100.00Ω) and adjust the offset trim (50 kΩ zero adjust) for a 0.00-V output. Next, set the decade box for a 140℃ output (154.26Ω) and adjust the gain trim (1 kΩ) for a 1.400-V output reading. Finally, set the box to 249.00Ω (400.00℃) and trim the linearity adjustment (5 kΩ) for a 4.000-V output. Repeat this sequence until all three points are fixed. The total error should be ±0.05℃ over the entire range for a normal100.00-Ω (0℃) sensor. Linear Technology. Linear Applications Handbook, 1990, p AN3-6.



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