The accuracy of the amplitude values is usually of less importance because DTF should be
used to troubleshoot a system and find problems so whether a connector is at 30 dB or 35
dB may not be as interesting as if the connector was at 35 dB one year ago and now it is at
30 dB. While the propagation velocity value remains fairly constant over the entire frequency
range, the insertion loss of the cable does not and this also affects the amplitude accuracy.