Data Acquisition Requirements For Good Dynamometer Card Analysis

To obtain meaningful results from Wave Equation analysis of surface dynamometer data, the acquired field data should meet certain minimum requirements. This paper will show the effects of the various parameters on the Down Hole Cards. Various parameters will be examined and their effects shown. Some of the topics covered will be: The Effects of Sampling frequency, Aliasing, Lowpass Filtering, Data Slew Rate, and Skew between Load and Position on Sampled Data. A technique, improving signal to noise ratio and performance by Over Sampling and Decimation will also be covered. It is hoped that this information will be useful in making informed decisions about system data gathering requirements.