Teledyne LeCroy WavePro Automation Command - Manual (Page 315)

Automation Command and Query Reference Manual - Control Reference
ShowISIPlot Bool
When set to True, this control turns on the display of the ISI Plot. The ISI Plot is for display only, no
jitter measurements are derived from it. See ISINumBits for more information.
It is worth noting that the list of patterns detected, which is displayed on the Pattern tab of the right
side dialog when ISI Plot is displayed, is the range of a hidden enum cvar, "Patterns". The value of
that cvar is the integer, in lsb first order, corresponding to the highlighted pattern in the ISI Plot. The
next to last bit is diplayed by the ISI Plot, lower value bits precede it and the most significant bit (in the
length specified in ISINumBits) follows it. Since the highlighted pattern only affects the GUI that
hidden cvar is not listed elsewhere in this manual. Its path is
app.SDA2.JitterMeasure.Pattern.Patterns. It is used in the example below.
Description
' Visual Basic Script
Set app = CreateObject("LeCroy.XStreamDSO")
app.SDA2.JitterMeasure.Pattern.ShowISIPlot
app.SDA2.JitterMeasure.ISINumBits = 6 ' the default value
app.SDA2.JitterMeasure.Pattern.Patterns = 16 ' selects pattern 000010,
the 1 is displayed
Example
ShowPattern Bool
This control corresponds to the "Show DigPatt" checkbox on the Pattern Analysis right side dialog.
Setting this control True enables the display of the currently found pattern as a digital (synthesized)
waveform of 1 and 0 bits. Where one state persists for multiple UI, the displayed waveform has small
bumps at the UI boundaries to enable easy identification of the number of UI included in that time
span.
Description
ShowSnCycle Bool
This control corresponds to the checkbox "Show DDjPlot" on the Pattern Analysis right side dialog.
The name of this control is an abbreviation for Synchronous n-cycle, which is an old name for this plot.
"DDj Plot" is more descriptive, this description will use the new name. This shows a plot of mean
edge offset from expected time vertically, vs UI number horizontally. Where the data persists in one
state for multiple UI the DDJ Plot has a straight line spanning that time. Where the line changes slope
there actually was an edge. For short patterns the DDJ Plot has an bold dot at each UI boundary
time. The DDJ Plot shows the same information as the DDJ Histogram (see ShowDDjHisto, above)
but in time order and not binned to the DDj Histogram's bin size.
Description
Strip Bool
This cvar probably should be hidden, but, unfortunately, it is not. It controls whether DDJ (that is jitter
correlated to the data pattern) is removed from each edge's jitter so that PJ detects only uncorrelated
periodic jitter, and so that the RjBUj histogram and track actually show only Rj and Bounded
Uncorrelated jitter. This cvar should be hidden because correct jitter processing depends on this
control being true. Although it might be interesting to turn it off and see how much worse the jitter
numbers get, we encourage you not to do that. Like all documented cvars this setting is stored in
saved setups, so if you do play with it be sure to set it True again; if left False it will stay false even
through power cycles because the scope saves its current setup automatically and restores its
previous setup at power on. Bottom line: This control should always be True for proper operation.
Description
1-301
918501 RevA