Horizontal and acquisition setups Select the acquisition mode
Overview
The acquisition mode determines how the waveform data points are pr
oduced from the sampled data.
To use
Select the acquisition mode by clicking the appropriate button.
If you use Average or Envelope mode, select the number of waveforms for that mode using the
multipurpose knob.
If you use Waveform Database mode, select the number of
samples using the multipurpose knob.
Behavior
A s ingle waveform data point can be made up of several sequentially acquired data points. The waveform
data points can also be created from a composite of sampled data taken from multiple acquisitions.
Sample mode acquisition creates a record point by saving one or more samples during each acquisition
interval (see page 195). Sample mode is the default acquisition mode. The instrument does no post
processing of the acquired samples in this mode.
Pk Detect (Peak Detect) acquisition alternates between saving the highest sample in one acquisition
interval and the lowest sample in the next acquisition interval. Peak Detect mode only works with
real-time, noninterpolated sampling.
Hi Res (High Resolution) acquisition averages all samples taken during an acquisition interval to
create a record point. This average results in a higher-resolution, lower-ban dwidth waveform. This
mode only works with real-time, noninterpolated sampling.
Envelope acquisition acquires and displays a waveform record that shows the extremes in variations
over several acquisitions. The instrument saves the highest and lowest values in two adjacent intervals
similar to the Peak Detect mode. Unlike Peak Detect mode, the peaks are gathered over many trigger
events.
Average acquisition a cquires and displays a waveform record that is the average result of several
acquisitions. T his mode reduces rand
om noise. Use the multipurpose knob to specify the number of
waveforms that you want to average.
After each trigger event, the instrument acquires data and then compares the minimum and maximum
values from the current acquisition with those stored from the previous acquisition. The final display
shows the most extreme values for all the acquisitions for each point in the waveform record.
WfmDB (Waveform Database) acquisition acquires and displays a waveform that is the accumulation
of several acquisitions. In addition to time and amplitude, the waveform displays a count of the
number of times a specific sample point has been acquired. The value at each point on the waveform is
a counter that reflects the hit intensity. The instrument acquires data after each trigger event using
194 DSA/DPO70000D, MSO/DPO/DSA70000C, DPO7000C, and MSO/DPO5000 Series
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