A practical circuit capable of delivering exactly 1 mV/°C
| Authors | Nick Cornford |
| Main Document | Article «DIY RTD for a DMM» |
| Description | Figure 3 |
| File Format / Size | PDF / 23 Kb |
| Document Language | English |
Other Materials from the Main Document
- Article «DIY RTD for a DMM»
- Figure 1. A bridge incorporating an RTD produces a voltage output related to the temperature, but usually with an offset 0 °C point
- Figure 2. Using matched current sources in the bridge gives a linear relationship between temperature and output, and helps us define a reference point of 0 °C. Choosing the currents carefully gives a bridge output of 1 mV / °C
- Figure 3. A practical circuit capable of delivering exactly 1 mV/°C
- Figure 4. Three-wire connection to the RTD allows cancellation of the cable's resistance
- Figure 5. A higher battery voltage allows the use of MOSFETs in the current sinks, while a lower current in the reference arm of the bridge saves some supply current
