User Manual

Teledyne LeCroy
WaveScan in WaveSurfer 3000 Oscilloscopes
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In Figure 1, WaveScan is still in its default state, which is edge mode. Edge settings are for a positive slope where
the edge threshold is 50% of the signal amplitude. Note that all such edges in the input signal are highlighted in
red. The first edge in the signal trace is brighter, indicating highlighting, and that highlighted section appears in the
WaveScan zoom view below.
Dig Deeper Into Waveforms
When using WaveScan, note that the zoomed area of the signal trace may be manipulated using the WaveSurfer
3000’s zoom controls. In addition, WaveScan’s powerful controls enable searching for a wide range of anomalies
within the signal. Opening the Mode menu within the WaveScan dialog reveals numerous options, including
searching for edges, runts, non-monotonic edges, serial or bus patterns, and measurements. Each mode can be
further customized to specify the precise nature of the anomaly.
With the Table option enabled, WaveScan will display all occurrences of the condition being searched for. The
WaveScan table shows the times at which each of the edges in the trace occurred relative to the trigger point.
Tapping any of the lines in the table changes the zoom view to the corresponding event in the signal trace.
Measurement Filters
To further refine searches for signal anomalies, WaveScan’s measurement mode provides a measurement filter.
This allows for measurement criteria to include attributes such as less than, greater than, within or outside of a
limit, plus or minus a delta, plus or minus a percentage, or the rarest events. Users may also invoke a filter
wizard, which can establish limits based on statistical distributions of the data set (such as ±1 sigma).
One may direct WaveScan to find specific events in the signal trace, and define what event is being sought. In
this example, WaveScan is looking for a glitch in the input signal from Figure 1. WaveScan is put in Measurement
mode, with the measurement being rise time. The filter method is “greater than” with a filter limit of 100 ns. The
glitch is shown in Figure 2.
Figure 2: Here, WaveScan has found the glitch it was seeking in the input signal