Digsilent offers a PDF with a time-distance sample diagram where all the factors are detailed and added. Download the PDF file and scroll down until you see Time-Distance diagram. There is also a drawing with elements you need to use for time-distance.
I have seen the PDF which was suggested by Mr.Robert Polubinski in one answer & also the user manual but can not understand the full procedure.
Digsilent offers a PDF with a time-distance sample diagram where all the factors are detailed and added. Download the PDF file and scroll down until you see Time-Distance diagram. There is also a drawing with elements you need to use for time-distance.