DWM1000 Antenna delay calibration the following questions

Hello friends! I continue to calibrate the antenna delay on the DWM 1000 and the board of my production. Help me find the answer to the following questions about the APS014 v1.01 file:

  1. What does perturbation limits mean and how to calculate it?
  2. It is not clear at all what needs to be done according to tables 4 and 5. Can someone explain in simple language ?)
    I apologize for my English and thank you in advance for the answer!!!