SDA Operator’s Manual
Qualified Parameters
Some LeCroy instruments and software packages give you the ability to constrain parameter
measurements to a vertically or horizontally limited range, or to occurrences gated by a second
waveform. Furthermore, both constraints can operate together. This capability enables you to
exclude unwanted characteristics from your measurements. It is much more restrictive than
Measure Gate, which is used only to narrow the span of the waveform for analysis, along the
horizontal axis.
Note: Since this feature operates on only a subset of the data, possible alerts or status indicators concerning the
measurement (such as " Data range too low") are not displayed.
Range Limited Parameters
Range Qualifier Setup
1. From the menu bar, select Measure, then Measure Setup... from the drop-down menu.
2. Touch a Px tab to open the setup dialog.
3. Touch inside the Source field and select a source from the pop-up menu.
4. Touch inside the Measure field and select a parameter from the pop-up menu.
5. Touch the Accept tab of the right-hand dialog, then touch the Values In Range checkbox.
Depending on whether you select a vertical or horizontal parameter, the correct units will be
automatically displayed (V, s, Hz, dB) in the Between and And fields. Or, if you select a
simple ratio parameter (such as power factor) that yields a dimensionless number, no units
will be displayed.
6. Touch the Find Range button to quickly display the most recent value of the parameter
measurement. From there it is a simple matter to set the desired range.
Amplitude Parameter
(range set manually)
Delay Parameter
(Find Range selected)
SDA-OM-E Rev H 177
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