
7 Analog Modules Waveform Digitizers
204 System Reference, January 2001
When the digitizer starts, no initial discard points are
stored. The digitizer stores the digitized waveform data
with the specified number of sample points into the speci-
fied waveform memory area, according to the sequence
program. The following figure shows the real-time wave-
form digitizing.
Figure 90 Real-Time Digitizing
The digitizer can also perform measurement at a higher
frequency (equivalent sampling frequency) than the real-
time digitizing, with the under-sampling technique called
Coherent Sampling.
For effective measurement, this coherent sampling should
use two master clocks. One master clock is for both the
DUT (input signal to digitizer) and the synchronization
trigger to the digitizer and one is for the sampling trigger
of the digitizer.
Synchronization trigger
Digitizing then memorizing
Sampling Period
Initial Discard
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