PressureMAT User Guide
Revision 8
Page 45/48
APPENDIX H: PressureMAT Smoothing Function (PV Filter)
Filtering of the Present Pressure Value with the PV Filter Function (also referred to as smoothing)
attempts to capture important data trends while leaving out noise and other outliers. In certain
applications, having a filter and an option for filter strength proves advantageous when measuring and
recording pressure with a PendoTECH PressureMAT™. The negative that comes with using a filter is
the increased amount of time it takes to stabilize and reach the actual value (if constant).
WARNING: Smoothing will lead to delayed alarm detection because readings are being
averaged and pressure spikes will not be immediately recognized.
The following set of four graphs gives an example of the how smoothing can present pump pulsation
differently by showing no filtering versus averaging a larger set of data values. The following
statistical analysis is used to demonstrate low, medium and high filtering.
%RSD (relative standard deviation) is a statistical measurement that describes the spread of data with
respect to the mean and the result is expressed as a percentage.
