LeCroy SDA, Operator'S Manual

Page: 97 / 397

SDA Operator’s Manual
6. Choose a line style for your trace: solid Line or Points .
Sequence Mode Display
To a set up Sequence Mode display, you must first have selected Sequence trigger mode in the
Timebase "Horizontal" dialog. You must also have entered a Num Segments value.
1. In the menu bar, touch Display; then touch Display Setup in the drop-down menu.
2. Touch inside the Display Mode field and select a display mode from the pop-up menu.
3. Touch inside the Num seg displayed field and enter a value, using the pop-up keypad. The
maximum number of segments that can be displayed is 80.
4. Touch inside the Starting at field and enter a value.
Note: The maximum value that you can enter for Starting at depends on the Num Segments value you entered in the
"Timebase" dialog. It also depends on the Num seg displayed value you entered here in the "Display" dialog. For
example, if you had entered a value of 500 in Num Segments , and a value of 10 in Num seg displayed , the maximum
value you can enter as a starting segment is 491so that 10 segments can be seen.
Persistence Setup
The analog Persistence feature helps you display your waveform and reveal its idiosyncrasies or
anomalies for a repetitive signal. Use Persistence to accumulate on-screen points from many
acquisitions to see your signal change over time. The instrument persistence modes show the
most frequent signal path "three-dimensionally" in intensities of the same color, or graded in a
spectrum of colors.
You can show persistence for up to eight inputs for any channel, math function, or memory
location (M1 to M4).
Saturation Level
The Persistence display is generated by repeated sampling of the amplitudes of events over time,
and the accumulation of the sampled data into "3-dimensional" display maps. These maps create
an analog-style display. User-definable persistence duration can be used to view how the maps
evolve proportionally over time. Statistical integrity is preserved because the duration (decay) is
proportional to the persistence population for each amplitude or time combination in the data. In
addition, the instrument gives you post-acquisition saturation control for a more detailed display.
When you select mode from the Persistence dialog (with All Locked selected), each
channel is assigned a single color. As a persistence data map develops, different intensities of
that color are assigned to the range between a minimum and a maximum population. The
maximum population automatically gets the highest intensity, the minimum population gets the
lowest intensity, and intermediate populations get intensities in between these extremes.
The information in the lower populations (for example, down at the noise level) could be of
greater interest to you than the rest. The Analog persistence view highlights the distribution of
data so that you can examine it in detail.
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