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Operator's Manual
Scan Modes
The scan mode determines the type of search to be performed. Select the Mode along with the Source trace
to be searched on the main WaveScan dialog. For each mode, different controls appear on the WaveScan
dialog, providing additional inputs to the search criteria. Make the appropriate entries in these fields before
starting the search.
EDGE MODE
Edge Mode is used for detecting the occurrence of edges. Events that meet the threshold level are captured
and tabulated. When the acquisition is stopped, scan filters can be applied to the edges to find specific
characteristics. Additional settings for Edge Mode are:
l Slope. Choose Pos, Neg, or Both.
l Level is (set in...). Choose Percent or Absolute.
l Percent/Absolute Level. Enter a threshold value as a percentage of Top to Base or voltage level. A
marker displayed over the source trace indicates the level.
NON-MONOTONIC MODE
Non-monotonic Mode looks for edges that cross a threshold more than once between high and low levels. All
events that meet the criteria of slope, hysteresis, and level are presented in a table and highlighted in the
source trace. The value displayed in the table is the difference of the max. and min. of the non-monotonicity.
This can be confirmed with cursors. The hysteresis value is used to eliminate noise. A non-monotonicity is
detected only when its amplitude is greater than the hysteresis. Therefore, when setting a hysteresis level,
set a value that is greater than the amplitude of the noise. Additional settings for Non-monotonic Mode are:
l Slope. Choose Pos, Neg, or Both.
l Hysteresis is (set in...). Choose Division, Percent, Absolute.
l Division/Percent/Absolute. Enter the hysteresis level in the units you selected.
l Levels are (set in...). Choose Percent, Absolute, or Pk-Pk%.
l High Level and Low Level. Enter the top and bottom thresholds in the units you selected.
RUNT MODE
Runt Mode looks for pulses that fail to cross a specified threshhold. You can search for positive-going or
negative-going runts, or both. An adjustable hysteresis band is provided to eliminate noise.
In the case of negative-going runt pulses, the value displayed in the table is the difference (delta) of the high
level of the signal and the runt amplitude (i.e., where the runt bottoms out). This can be confirmed by placing
cursors on the runt pulse and reading the delta Y value in the trace labels. In the case of positive-going runt
pulses, the value displayed in the table is the absolute value of the amplitude of the runt pulse. Additional
settings for Runt Mode are:
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