User`s guide

Description
This command selects whether the instrument uses the rising edge or the
falling edge of the trigger signal on the rear-panel Ext Trig BNC connector.
The default is NEG (falling edge).
For the 34411A and L4411A, this command also affects the slope of
detection for an internal trigger on a defined level (see the TRIGger:LEVel
command).
It is recommended that all triggered measurements be made using
an appropriate fixed manual range. That is, turn autorange off
(SENSe:<function>:RANGe:AUTO OFF), or set a fixed range using
the SENSe:<function>:RANGe, CONFigure, or MEASure command.