User`s guide

Description
This command sets a bit in the Standard Operation Register group event
register when the specified number of readings have been stored in reading
memory. When the specified number of readings have been stored in
memory, the "Memory Threshold" bit (bit 9) is set to a "1" in the event
register.
For more information on the SCPI Status System for the
Agilent 34410A, 34411A, and L4411A see Status System
Introduction.