Keysight Technologies 3458A Guide D'utilisation page 212

5 Digitizing
input signal) the multimeter delays the trigger point and takes 5 more samples.
This process repeats until the specified number of samples are completed.
In the following example, the SSDC command is used to digitize a 1 MHz signal
with a peak value of 5 V riding on a 5 V DC level. The SWEEP command instructs
the multimeter to take 4000 samples with a 10-nanosecond effective_interval.
Lines 60 through 80 program the voltage level and the slope for the LEVEL sync
source event. This will initiate sampling when the first period of the input signal
reaches 7.5 VDC (75% of the 10 V range). Line 90 satisfies the trigger arm event,
which essentially enables the sync source event.
10OUTPUT 722;"PRESET FAST"!TARM SYN, TRIG AUTO, DINT FORMATS
20OUTPUT 722;"MEM FIFO"!ENABLE READING MEMORY, FIFO MODE
30OUTPUT 722;"MFORMAT SINT"!SINT READING MEMORY FORMAT
40OUTPUT 722."SSDC 10"!SUB-SAMPLING, 10 V RANGE, LEVEL SYNC SOURCE
45 !EVENT (DEFAULT EVENT)
50OUTPUT 722;"SWEEP 10E-9,4000"!4000 SAMPLES, 10 ns EFFECTIVE INTERVAL
60OUTPUT 722;"LEVEL 75 DC"!LEVEL TRIGGER AT 75% OF RANGE, DC-COUPLED
70OUTPUT 722;"SLOPE POS"!LEVEL TRIGGER ON POSITIVE SLOPE
80OUTPUT 722;"SSRC LEVEL"!LEVEL SYNC SOURCE EVENT
90OUTPUT 722; "TARM SGL"!ENABLE SAMPLING
100END
Sub-sampling remarks
– For sub-sampling, the trigger event and sample event requirements are
– You cannot use the NRDGS command for sub-sampling. You must use the
212
ignored (these events are discussed in
that apply to sub-sampling are the trigger arm event (TARM command) and
the sync source event (SSRC command).
SWEEP command to specify the number of samples and the effective_interval.
The minimum effective_interval for sub-sampling is 10 nanoseconds. The
maximum rate at which samples arc taken is 50k samples per second (20 µs
between samples).
Chapter 4). The only triggering events
Keysight 3458A User's Guide