Keysight Technologies 3458A Guide D'utilisation page 213

– You cannot use autorange for sub-sampled measurements; you must specify
– If reading memory is disabled when you execute the SSAC or SSDC command,
– When sub-sampling with reading memory is enabled, reading memory must
– When sub-sampling an input signal with a frequency content ≥1 MHz, the first
Keysight 3458A User's Guide
the range as the first parameter of the SSAC or SSDC command (max._input
parameter). The max._input parameters and the ranges they select are:
max._ input parameter
0 to .012
>.012 to .120
>.120 to 1.2
>1.2 to 12
>12 to 120
>120 to lE3
As with direct sampling, you can specify a level triggering voltage up to 500%
of the range. The required SINT format, however, cannot handle samples
greater then 120% of range.
the multimeter automatically sets the output format to SINT (the memory
format is not changed). Later, when you change to another measurement
function, the output format returns to that previously specified. You must use
the SINT output format when sub-sampling and outputting samples directly to
the GPIB. You can however, use any output format if the samples are first
placed in reading memory (see next remark). To do this, you should enable
reading memory before executing the SSAC or SSDC command (executing
SSAC or SSDC does not change the output format to SINT when reading
memory is enabled).
be in FIFO mode, must be empty (executing MEM FIFO clears reading
memory), and the memory format must be SINT prior to the occurrence of the
trigger arm event. If not, the multimeter generates the SETTINGS CONFLICT
error when the trigger arm event occurs and no samples are taken.
sample may be in error because of interpolator settling time. To ensure the first
sample is accurate, insert a 500 ns delay using the DELAY 500E-9 command.
Selects range
10 mV
100 mV
1 V
10 V
100 V
1000 V
Digitizing 5
Full scale
12 mV
120 mV
1.2 V
12 V
120 V
1050 V
213