Completion
The Completion control is provided to allow you to make a tradeoff between
how often equivalent time waveforms are measured and how much new data
is included in the waveform record when a measurement is made. The
completion control has no effect in the real-time mode, since the entire
waveform record is filled on every trigger. The control is, however, useful in
equivalent-time mode because it is possible that as few as 0 new data points
are placed in the waveform record as the result of any given trigger event. It
can take many trigger events to fill the entire waveform record.
When the Completion control is on, it specifies how many of the data point
storage bins (time buckets) in the waveform record must contain a waveform
sample before a measurement is made. For example, if Completion is set to
60%, then 60% of the storage bins in the waveform record need to contain a
new waveform data sample. If averaging is on, then the criteria is more
stringent. At least 60% of the storage bins must contain waveform data
values that were averaged the number of times specified by the number of
averages control. After the measurement is made, the data in the waveform
record is erased and the acquisition process starts over. Due to the nature of
the real-time acquisition mode, 100% of the waveform record bins are filled
after each trigger event and all of the old data in the record is replaced by
new data. Hence, the Completion control really has no effect and the
behavior is exactly what is expected if Completion were set to 100%.
When the Completion control is off, the oscilloscope makes measurements on
waveforms after each acquisition cycle, regardless of how complete they are.
The waveform record is not cleared after each measurement, rather old data
points are replaced by new samples as they become available.
Typically, a 90% completion setting provides very good measurement results.
Reaching 100% completion can require substantially more time than reaching
90% when at faster sweep speeds. Depending on the shape of your
waveform, you may be able to make accurate measurements with Completion
settings of even less than 90%. For a uniform data distribution when using
the color graded display, waveform histogram, or mask testing modes, set
Completion to 100%.
Selecting default setup or pressing autoscale sets Completion to off.
Acquisition Menu
Completion
3–20
To Next Page
Loading...
