User`s guide

Remarks
Storing readings in memory using the INITiate command is faster than
sending readings to the output buffer using the READ? command. The
INITiate command is also an "overlapped" command. This means that after
executing the INITiate command, you can send other commands that do
not affect the measurements.
The 34410A provides volatile reading memory for up to 50,000 readings.
The 34411A/L4411A provides volatile reading memory for up to 1,000,000
readings. If memory overflows, the new readings will overwrite the first
(oldest) readings stored; the most recent readings are always preserved.
In addition, bit 14 (Mem Ovfl) is set in the Questionable Data Register's
condition register (see Status System Introduction).
To retrieve the readings from memory, use the FETCh? command. Use
DATA:REMove? to remove data points. Or use the R? command to read and
remove all of the available data.
The ABORt command may be used to return to idle.