Keysight Technologies 3458A Guide D'utilisation page 156

4 Making Measurements
Increasing the Reading Rate
This section discusses the multimeter's high-speed mode and the factors that
affect the reading rate. It contains program examples that show how to increase
the reading rate, how to transfer readings at high-speed directly to the controller,
how to perform high-speed transfers from reading memory to the controller, and
how to determine the reading rate.
High-speed mode
For DC voltage, DC current, 2- or 4-wire ohms, and direct- or sub-sampled
measurements,
initiated, the integration time is less than 10 PLCs, and the following commands
have been executed:
ARANGE OFF
DISP OFF
MATH OFF
MFORMAT SINT or DINT (only required when reading memory is enabled)
OFORMAT SINT or DINT (only required when reading memory is not enabled)
While readings are being taken in the high-speed mode, the multimeter becomes
completely dedicated to the measurement process. This means that it will not
process any commands until the specified readings are completed. When
readings are being sent directly to the output buffer in the high-speed mode, the
multimeter waits until each reading is removed from the output buffer before
placing the next reading in the output buffer. This ensures that readings will not
be lost because of bus/controller speed limitations. (When not in the high-speed
mode, the multimeter will write-over any reading in the output buffer when a new
reading is available.)
If reading memory is enabled in the FIFO mode and reading memory becomes full
in the high-speed mode, the trigger arm event becomes HOLD which stops
readings and removes the multimeter from the high-speed mode. After removing
some or all of the readings from memory, you can resume measurements by
changing the trigger arm event (TARM command). In the LIFO mode, when
reading memory becomes full, the oldest readings are replaced with the newest
readings regardless of whether in high-speed mode or not.
[1] Refer to
156
[1]
the multimeter enters the high-speed mode when readings are
Chapter 5 for more information on direct- and sub-sampled measurements.
Keysight 3458A User's Guide