Set the delay of the trailing edge of the pulse relative to start of pulse
period. This is an alternative method of programming pulse width.
This command is affected by the :PULS:HOLD[1|2] command, which
determines the value to be held constant as the period is adjusted: the
specified pulse width value, or the specified pulse duty cycle value, or the
specifies trailing delay. See the :PULS:HOLD[1|2] command for further
information.