Keysight Technologies 3458A Guide D'utilisation page 347

– When sub-sampling with reading memory enabled, reading memory must be
– For sub-sampling, the trigger event and the sample event are ignored (these
– In sub-sampling, samples are taken on more than one period of the input
– The effective_interval between samples and the total number of samples taken
– Related commands: DSAC, DSDC, FUNC, ISCALE?, LEVEL, LFILTER, MEM
Examples
In the following program, the sub-sampled data is sent to reading memory using
the required SINT memory format. The multimeter places the samples in memory
in the corrected order. The samples are then transferred to the controller using the
DREAL output format (when placing sub-sampled data in reading memory first,
you are not restricted to using the SINT output format).
10 OPTION BASE 1 !COMPUTER ARRAY NUMBERING STARTS AT 1
20 REAL Samp(1:200) BUFFER !CREATE BUFFER ARRAY
30 ASSIGN @Dvm TO 722 !ASSIGN MULTIMETER ADDRESS
40 ASSIGN @Samp TO BUFFER Samp(*) !ASSIGN BUFFER
50 OUTPUT @Dvm;"PRESET FAST" !TARM SYN, TRIG AUTO, DINT FORMATS
Keysight 3458A User's Guide
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.
events are discussed in
sub-sampling are the trigger arm event (TARM command) and the sync source
event.
waveform. When the samples are sent directly to reading memory (MEM
command), the multimeter automatically reconstructs the samples producing
a composite waveform. When the samples are sent to the output buffer, the
controller must use an algorithm to reconstruct the composite waveform.
parameters for this algorithm are provided by the SSPARM? command.
are specified by the SWEEP command. (You cannot use the NRDGS command
for sub-sampling.) In sub-sampling, the multimeter will use as many periods of
the input signal as necessary to achieve the specified effective_interval. The
minimum effective_interval for sub-sampling is 10 nanoseconds. (Refer to
Sub-Sampling in Chapter 5
FIFO, SLOPE, PRESET FAST, PRESET DIG, SSDC, SSPARM?, SSRC, SWEEP,
TARM
Chapter 4). The only triggering events that apply to
for a detailed description of the process.)
Command Reference 6
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