Electrically noisy environments

EMF noise emanating from the AC mains power grid can be a significant source of measurement error. 60 Hz noise is common in the United States. 50 Hz noise is common in Europe and other regions. This noise can usually be filtered out using the F_N1 (first notch frequency) parameter of the Therm109, instruction.

NOTE:

Older data logger models, such as the CR3000, CR1000, and CR800-series use an Integration parameter instead of F_N1. For these models, specify _60Hz for the Integration parameter to filter 60 Hz noise.

The following code snippet is for a CR6-series data logger and filters 60 Hz noise. Code for other data logger models will be similar; however, the terminal numbers and names may vary depending on the model.

Therm109(T109_C,1,U1,U10,20000,60,1.0,0.0)