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| resources:eval:user-guides:eval-ad7441x:tools:3wrtd [14 Sep 2021 16:11] – [Open Wire Detect] Bríde Ní Riagáin | resources:eval:user-guides:eval-ad7441x:tools:3wrtd [14 Sep 2021 16:13] – [RTDs] Bríde Ní Riagáin |
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| \\ ===RTD Types=== | \\ ===RTD Types=== |
| 2-wire RTDs are typically used for low accuracy applications and when the distance to the sensor is short (lead lengths are short). Longer leads lead to larger lead resistances, which add error to the overall resistance measurement. If long lead lengths are in use or higher accuracy is required, 3-wire RTDs are used. In this case, it is assumed that each of the leads are of similar length and resistance. A 3-wire RTD measurement allows for an estimate of this lead resistance to be made and this in turn is factored out of the overall resistance measurement. Finally, 4-wire RTDs provide the best accuracy - 2 wires are used to source the excitation current through the sensor while the remaining 2 wires are used to directly sense the voltage drop across the RTD sensor. | 2-wire RTDs are typically used for low accuracy applications and when the distance to the sensor is short (lead lengths are short). Longer leads result in larger lead resistances, which add error to the overall resistance measurement. If long lead lengths are in use or higher accuracy is required, 3-wire RTDs are used. In this case, it is assumed that each of the leads are of similar length and resistance. A 3-wire RTD measurement allows for an estimate of this lead resistance to be made and this in turn is factored out of the overall resistance measurement. Finally, 4-wire RTDs provide the best accuracy - 2 wires are used to source the excitation current through the sensor while the remaining 2 wires are used to directly sense the voltage drop across the RTD sensor. |
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