Positive feedback reduces linearity error to < ±0.05 °C over -127 °C to +380 °C. The x-axis = IO (mA), left y-axis = PRTD temperature, right y-axis = linearity error. T°C = 31.7(IO - 8 mA)
| Authors | Stephen Woodward |
| Main Document | Article «Positive analog feedback linearizes 4 to 20 mA PRTD transmitter» |
| Description | Figure 4 |
| File Format / Size | PDF / 9 Kb |
| Document Language | English |
Other Materials from the Main Document
- Article «Positive analog feedback linearizes 4 to 20 mA PRTD transmitter»
- Figure 1. The PRTD 4 to 20 mA loop transmitter with constant current PRTD excitation that relies on 2nd order software nonlinearity correction math
- Figure 2. A platinum RTD bridge where feedback to the bridge from A3 linearizes the circuit
- Figure 3. A PRTD transmitter based on the classic LM10 op-amp plus a 200 mV precision reference combo
- Figure 4. Positive feedback reduces linearity error to < ±0.05 °C over -127 °C to +380 °C. The x-axis = IO (mA), left y-axis = PRTD temperature, right y-axis = linearity error. T°C = 31.7(IO - 8 mA)
- Figure 5. Linearized temperature transmitter modified for a post-assembly tweaking using his procedure