User`s guide

Description
This command selects the integration time in seconds (called aperture time)
for resistance measurements.
You should use this command only when you want precise control
of the integration time of the multimeter. Otherwise, specifying
integration time using NPLC (see [SENSe:]RESistance:NPLC
command) offers better power-line noise rejection characteristics
(for values of NPLC greater than 1).