Keysight Technologies 3458A Guide D'utilisation page 157

In the high-speed mode, the input buffer is temporarily disabled while readings
NOTE
are being made. Also, if END ALWAYS was specified (specifies the GPIB EOI
mode), the EOI mode changes to END ON while the readings are being made.
Following completion of the readings, the input buffer mode and the EOI mode
return to that previously specified.
In the high-speed mode, the multimeter will respond only to the GPIB CLEAR
command (Device Clear). If for some reason you must remove the multimeter from
the high-speed mode, send the following:
CLEAR 722
The CLEAR command suspends measurements which removes the multimeter
from the high-speed mode. Refer to
CLEAR command.
Configuring for fast readings
The PRESET FAST command executes a series of commands that configure for
fast readings. In addition, the reading rate is affected by the integration time and/
or resolution; triggering setup: delay time; AC bandwidth (for AC measurements
only): and, for resistance measurements only, the offset compensation mode.
In addition to the commands discussed in this section, the DEFEAT command
NOTE
can be used to speed throughput by disabling the multimeter's input protection
algorithm and some syntax and error checking algorithms. With these
algorithms disabled, the multimeter can change to a new measurement
configuration faster than it can with them disabled. Refer to the DEFEAT
command in
Keysight 3458A User's Guide
Chapter 6 for details and a CAUTION statement concerning its use.
Making Measurements
Appendix B for more information on the GPIB
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