User`s guide

Remarks
You can read the count at any time, even during a series of
measurements.
Reading memory (RDG_STORE) can store up to 50,000 readings for the
34410A, or up to 1,000,000 readings for the 34411A/L4411A.
Non-volatile memory (NVMEM) can store up to 50,000 readings for the
34410A, 34411A, or L4411A.
The instrument clears all readings from memory after a Factory Reset
(*RST command), after an Instrument Preset (SYSTem:PRESet command),
or when mainframe power is cycled.