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The Viscous Criterion function in DIAdem (ChnVCCalc) specifies the input data channel to be unfiltered deformation signal in meters. For THOR / WorldSID that uses IR-TRACC, the unfiltered voltage deflections are converted after processing with the respective equations to CFC filtered deflections in mm. In this case can the input to "ChnVCCalc" be the filtered deflection in mm (of course converted to meters).