LeCroy SDA, Operator'S Manual

Page: 215 / 397

SDA Operator’s Manual
Delay Control
As you change the timebase, this control allows you to either keep the horizontal offset indicator
stationary (when
Div is selected) or to have it move with the trigger point (when Time is
selected). The advantage of selecting Div is that the trigger point will remain on the grid as you
increase the timebase; whereas, if Time is selected, the trigger point could move off the grid.
Note: Regardless of whether you select Time or Div , the "Delay" shown in the timebase setup dialog always indicates
time. However, when Div is selected for Delay In, the delay in time is scaled proportional to the change in timebase,
thereby keeping the division on the grid constant.
1. In the menu bar touch Utilities ; then touch Preferences in the drop-down menu.
2. Touch the Acquisition tab.
3. Under Delay Setting constant in: , touch either the Div or Volts button.
Trigger Counter
Checking the Reset trigger counter before starting a new acquisition checkbox clears the
trigger counter each time the scope issues an arm acquisition command. This applies when you
have set a trigger Holdoff condition in the Trigger dialog in either time or events:
The default condition of this control is off (unchecked).
Performance Optimization
You can set up the scope to optimize either calculating speed or display speed. If the display
update rate is of primary concern to you, optimize for Display. If acquisition and analysis are more
important, optimize for analysis. Optimizing for analysis can be useful when persistence or
averaging is used, giving higher priority to waveform acquisition at the expense of display update
rate.
The choices are presented as a spectrum with highest values at the extremes:
1. In the menu bar touch
Utilities ; then touch Preferences in the drop-down menu.
2. Touch one of the optimization icons.
SDA-OM-E Rev H
215