Keysight Technologies 3458A Guide D'utilisation page 150

4 Making Measurements
When using the SINT or DINT memory/output format, the multimeter applies a
NOTE
scale factor to the readings. The scale factor is based on the multimeter's
measurement function, range, A/D converter setup, and enabled math
operations. You should not use the SINT or DINT format for frequency or period
measurements; when a real-time or post-process math operation is enabled
(except STAT or PFAIL); or when autorange is enabled.
– Single Real (SREAL) or Double Real (DREAL) Unlike the SINT and DINT
The OFORMAT command specifies the output format for readings (the power on
and default format is ASCII). For example, to select the double integer format,
send:
OUTPUT 722;"OFORMAT DINT"
Overload indication
The multimeter indicates an overload condition (input greater than the present
range can measure) by outputting the largest number possible for the particular
output format as follows.
SINT format: +32767 or -32768 (unscaled)
DINT format: +2.147483647E+9 or -2.147483648E+9 (unscaled)
ASCII, SREAL, DREAL: +/-1.OE+38
150
measurements (5.5 digits or greater) at the highest possible speed on a fixed
range.
formats, readings output in SREAL or DREAL format are not scaled and can be
used with any measurement function/multimeter configuration. (Since there is
no scale factor, the SREAL and DREAL formats are ideal when autoranging
and/or a math function is enabled.) The DREAL format has the added
advantage that no conversion is necessary by the controller. Use the SREAL,
format for measurements with ≤6.5 digits of resolution. Use the DREAL format
for measurements with >6.5 digits of resolution.
Keysight 3458A User's Guide