If the downloaded data does not included the "average value over time" window, a calculation error occurs in the TDC (TDAS Control) data linearization process that results in corrupted displacement data.
For example, if the "average value over time" window is from T = -0.05 to -0.01 and the data is downloaded from T = -0.02, the problem occurs. See attached example plot.
The problem may occur in TDC versions 7.1.1F and earlier.
From TDC version 7.1.1G the problem has been corrected.