Timeline for RTD sensors and the mystery of Voltage Vs Current sources
Current License: CC BY-SA 3.0
5 events
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| Jan 17, 2015 at 18:31 | comment | added | Tomek | Thanks! Wheatstone bridge = good for precisely when you don't expect much resistance change; I just didn't consider that there is a temperature scenario in which that applies [when you're looking at a small temperature range]. | |
| Jan 16, 2015 at 18:08 | comment | added | Spehro 'speff' Pefhany | @Tomek In many applications the range required is very small (you want to control something at 70°C, say, so you know the RTD will be 127.08\$\Omega\$, and a Wheatstone bridge can allow you to use an inexpensive voltage reference (with expensive resistors) and get excellent results. | |
| Jan 16, 2015 at 17:35 | history | edited | George Herold | CC BY-SA 3.0 |
added 218 characters in body
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| Jan 16, 2015 at 16:37 | comment | added | Tomek | Thanks George. Do you mind adding a note to explain why you use a full bridge? I've seen circuits that do that, but it seems more beneficial when you want to linearize a response or deal with a very mildly changing resistance. The RTD resistors have a fairly nice linear response and strong enough already. So I sort of assume the wheatstone bridge is a superfluous method. Thanks. | |
| Jan 16, 2015 at 16:06 | history | answered | George Herold | CC BY-SA 3.0 |