A simple circuit feeds the RTD, amplifies the resulting voltage, and uses some positive feedback to compensate for the sensor's non-linear response to temperature
| Authors | Nick Cornford |
| Main Document | Article «Newer, shinier DMM RTDs. Part 1» |
| Description | Figure 1 |
| File Format / Size | PDF / 9 Kb |
| Document Language | English |
Other Materials from the Main Document
- Article «Newer, shinier DMM RTDs. Part 1»
- Figure 1. A simple circuit feeds the RTD, amplifies the resulting voltage, and uses some positive feedback to compensate for the sensor's non-linear response to temperature
- Figure 2. With compensation, the circuit's output can be very close to ideal. (Real-world components may modify this somewhat.)
- Figure 3. Compensated gain stage A1a gives an output of just over 1 mV/°C, with an offset. A1b generates a voltage corresponding to that offset at 0 °C. Tracking of the two op-amp halves should minimize errors