Timeline for RTD sensor circuit design
Current License: CC BY-SA 4.0
9 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Sep 20, 2018 at 16:30 | comment | added | analogsystemsrf | Yes---provide Local charge sources for the opamps. Use 10uF right at the opamp VDD pin. And place 10 ohm resistors between that VDD pin and the central bulk/raw supply. Or even 100 ohm. 10uF * 100ohm is 1milliSec tau, or 160Hz F3dB, thus the fast-edge high dI/dT of power supply diodes will be attenuated, and the Opamps' PSRR will have less performance requirements. | |
| May 21, 2018 at 16:23 | vote | accept | Emily L. | ||
| May 21, 2018 at 13:33 | comment | added | Emily L. | @HenryCrun that is a very nice observation, thank you. I think an NTC might be better for to me. It looks like I then don't need the current source. I can just use a voltage divider to reduce the nonlinearity enough and op-amp it up and send to ADC. | |
| May 21, 2018 at 9:39 | comment | added | Henry Crun | NTC thermistors have very high accuracy, far higher gain, and are easier to use at these temperatures. Unless you have a good reason to use Pt-RTD, they are a better choice. | |
| May 21, 2018 at 6:14 | answer | added | user76844 | timeline score: 1 | |
| May 21, 2018 at 3:38 | answer | added | Henry Crun | timeline score: 1 | |
| May 20, 2018 at 23:45 | answer | added | Sara Heart | timeline score: 0 | |
| May 20, 2018 at 23:12 | answer | added | Spehro 'speff' Pefhany | timeline score: 2 | |
| May 20, 2018 at 22:48 | history | asked | Emily L. | CC BY-SA 4.0 |