Keysight Technologies 3458A Guide D'utilisation page 158

4 Making Measurements
PRESET FAST command
The PRESET FAST command disables many functions that slow the reading rate
and configures the multimeter for fast reading transfer to memory and to the
GPIB.
and the reason for executing each.
Table 4-3
Command
DCV 10
AZERO OFF
DISP OFF
MATH OFF
MFORMAT DINT
OFORMAT DINT
[a] For direct-sampled digitizing, the format used depends on the amplitude of the input signal. Refer to
158
Table 4-3 shows the speed-related commands executed by PRESET FAST
Commands executed by PRESET FAST
Reason
Selects DC voltage measurements on the 10 V range, which disables autorange.
The autorange function samples the input before each reading, taking more time
per reading than readings made on a fixed range. The disadvantage of a fixed range
is lower resolution for signals that are less than 10% of full scale and the possibility
of an overload condition for readings greater than full scale.
With autozero enabled, a zero measurement is made following each reading (for DC
measurements only), which increases the time per reading.
The time required for the multimeter to update its display slows the reading rate.
Any enabled real-time math operation(s) slow the reading rate. If you must perform
math operations on readings, use the post-process math (MMATH command). Refer
to Math Operations
Readings come from the A/D converter in either SINT or DINT format (the format
used depends on the specified measurement resolution;
selected by PRESET FAST, the A/D converter uses DINT). The fastest way to transfer
readings to reading memory is to have the memory format (MFORMAT) match the
A/D converter's format so that no conversion is necessary. (Refer to
Formats
Readings come from the A/D converter in either SINT or DINT format (the format
used depends on the specified measurement resolution;
selected by PRESET FAST, the A/D converter uses DINT). The fastest way to transfer
readings to the output buffer is to have the output format (OFORMAT) match the A/
D converter's format so that no conversion is necessary. In addition, when the
output format matches the reading memory format, no conversion is required to
recall readings from memory. Remember to use the ISCALE? command to retrieve
the scale factor when using the SINT or DINT output format. (Refer to
Formats
details.
later in this chapter for more information.
earlier in this chapter for information on when to use SINT or DINT).
earlier in the chapter for information on when to use SINT or DINT.)
[a]
in the configuration
Reading
[a]
in the configuration
Reading
Chapter 5
Keysight 3458A User's Guide
for