Acquisition
Equivalent-time Sampling
The instrument uses equivalent-time
samplingtoex
tend its sample rate beyond
its real-time maximum sampling rate.
Equivalent-time sampling is only used if
Equivalent Ti
me is selected and the time
base is set to a sampling rate that is too fast
to create a waveform record using real-time
sampling.
The instrument makes multiple acquisitions
of a repetitive waveform to obtain the sample
density requ
ired for one complete waveform
record. Thus, equivalent time sampling
should only be used with repetitive signals.
Waveform R
ecord
The instrument builds the waveform record
through use of the following parameters:
Sample interval: The time between
sample po
ints.
Record le
ngth: The number of samples
required to fill a waveform record.
Trigger point: The zero time reference in
a waveform record.
Horizontal position: When horizontal
delay is o
ff, the horizontal position is
a percentage of the waveform record
between 0 and 99.9 percent. The trigger
point an
d the horizontal reference are at
thesametimeinthewaveformrecord.
For example, if the horizontal position is
50 perce
nt, then the trigger point is in the
middle o f the waveform record. When
horizontal delay is on, the time from the
trigge
r point to the horizontal reference
is the horizontal delay.
DPO7000 S eries Quick Start User Manual 21
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