User`s guide

Description
This command selects the number of readings (samples) the meter will take
per trigger.
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.