SONTimeBase

  SONTIMEBASE Get or set the base time units for the file
  (usually 1e-6seconds)
  DTICKLEN=SONTIMEBASE(FH, DTB)
                               FH  SON file handle
                               DTB If <= 0 ignored
                                      >0 the new value to set

  Author:Malcolm Lidierth
  Matlab SON library:
  Copyright © The Author & King's College London 2005-2006