User`s guide

Remarks
The front-panel sample annunciator ( "*" ) turns on during each
measurement at slower rates. However, the annunciator toggles at a fixed
rate for fast measurements.
The 34411A provides the pre-trigger feature for all measurement functions
except CONTinuity and DIODe test.
After setting the sample count, you must place the meter in the "wait-for-
trigger" state using the INITiate or READ? command. An external trigger
will be buffered until the meter is in the "wait-for-trigger" state.
You can use the specified sample count in conjunction with a trigger count
(see TRIGger:COUNt command) which sets the number of triggers to be
accepted before returning to the "idle" trigger state. In this case, the total
number of readings returned will be the product of the sample count and
trigger count.
Number of Readings = Sample Count x Trigger Count
If more than 50,000 readings for the 34410A, or 1,000,000 readings for
the 34411A/L4411A are to be taken, the data must be read from reading
memory fast enough to avoid a memory overflow. The most recent
readings are preserved. The oldest readings are overwritten in reading
memory if an overflow occurs.
You can use the SAMPle:COUNt:PRETrigger command (34411A/L4411A) to
set a pretrigger count, which reserves memory for a specified number of
pretrigger samples.
The CONFigure and MEASure? commands automatically set the sample
count to "1".
The instrument sets the sample count to "1" after a Factory Reset ( *RST
command) or a Preset (SYSTem:PRESet 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.