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Noise Filtering for RTDs

Shielded twisted cable and a simple capacitor filter removes most noise from RTD signals

Noise pickup by the RTD cables can sometimes be a problem. A small amount of voltage noise pickup is reflected in a noise in the temperature reading, with ±10μV noise causing as much as a ±0.1°C reading-to-reading temperature variation when using a 3-wire RTD.

The first line of defense against noise pickup is proper cabling. The RTD wires should be connected through shielded cable containing a twisted pair for the RTD element wires.

Much of the remaining measurement noise can be removed by filtering at the Wildcard input using 10μF ceramic capacitors, as shown in the following circuit schematic. The capacitors should be ceramic rather than electrolytic.

Filtering a 3-wire RTD for better noise immunity

Noise pickup by the RTDs can be greatly reduced by placing 10μF ceramic capacitors.

Pages about measuring RTDs
This page is about: Noise Filtering RTD Readings, Noise Reduction of RTD Temperature Measurements, Filtering RTD Signals, Removing RTD Errors – Noise pickup in RTD cables, causing temperature errors, is remedied using shielded twisted pair cables and filtering with ceramic capacitors as shown in these noise filtering circuit schematics and diagrams. platinum RTD accuracy, RTD errors, RTD resistance to temperature, 2-wire RTD, 3-wire RTD, noise filtering to reduce measurement error