User`s guide

Description
This command sets a sample interval for timed sampling when the sample
count is greater than one. Use the SAMPle:SOURce command to set the
TIMer option for timed sampling.
The first sample is taken one trigger delay time after the trigger (the delay
being set with the TRIGger:DELay command). The second sample starts one
sample interval after the start of the first sample, and so forth, as shown
below:
Note that the sample timing is determinant because the start of each sample
is determined by the sample interval. Integration and autoranging affect the
sampling time for each sample, but not the sample interval as long as the
sample interval is longer than the sampling time. Periodic sampling
continues until the sample count (set with the SAMPle:COUNt command) is
satisfied.
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.