comment on this article

Feel the heat

A/D converter requirements for temperature measurement systems. By Mary Mc Carthy and Eamonn Dillon.

Several types of sensor can be used to measure temperature – which one depends on the temperature range and the required accuracy. System accuracy depends not only on the sensor, but also the performance of the a/d converter used to digitise its output. In many cases, the sensor’s output signal is small, so a high resolution a/d converter is required. Sigma-delta (SD) a/d converters are suitable, as they offer high resolution and often include additional on chip circuitry.

Thermocouples are especially useful for making extremely high temperature measurements (up to 2300ºC) in hostile environments. They produce only millivolts of output, so require precision amplification for further processing. Sensitivity varies for different types of thermocouple, but it is typically only a few microvolts per degree, so a high resolution, low noise a/d converter is required for precision.

Readers of New Electronics may request the complete article by email by clicking here

Vanessa Knivett

Comment on this article

This material is protected by MA Business copyright See Terms and Conditions. One-off usage is permitted but bulk copying is not. For multiple copies contact the sales team.

What you think about this article:

Add your comments


Your comments/feedback may be edited prior to publishing. Not all entries will be published.
Please view our Terms and Conditions before leaving a comment.

Related Articles