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HDO9000 High Definition Oscilloscopes Operator's Manual
EMC Pulse Parameter Software Package
The EMC option enhances the oscilloscope's measurement functionality for the @level parameters
Rise@Level, Fall@Level, Width@Level, Time@Level, and dTime@level.
In addition to setting the Level for these measurements using the absolute voltage or percentage of
amplitude based on the
actual Peak to Peak
l
0V - Max
l
0V - Min
l
Once the option is activated, the new selections are added to the Level pop-up menu. Otherwsise,
parameters are configured exactly the same as with other measurements.
Histogramming is also enhanced with the ability to plot up-to-2-billion events when configuring the
histogram and the addition of 19 histogram-specific measurements. To set up one of these
measurements in a parameter location, select the Math function (Fx) location of the histogram as the
measurement Source.
Calculating Measurements
The instrument uses the following methods to calculate measurements.
Determining Top and Base Lines
Proper determination of the top and base reference lines is fundamental for ensuring correct
parameter calculations. The analysis begins by computing a histogram of the waveform data over the
time interval spanned by the left and right measurement gates. For example, the histogram of a
waveform transitioning in two states will contain two peaks (see figure). The analysis will attempt to
identify the two clusters that contain the largest data density. Then the most probable state
(centroids) associated with these two clusters will be computed to determine the top and base
reference levels: the top line corresponds to the top and the base line to the bottom centroid.
104
computed Top and Base
Lines, you may set Level using:
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