Keysight Technologies 6811C Programming Manual page 258

5 Programming Examples
The range for this offset is 4096 to 2E9 points. As shown in the following figure,
when the offset is negative, the values at the beginning of the data record
represent samples taken prior to the trigger. When the value is 0, all of the values
are taken after the trigger. Values greater than zero can be used to program a
delay time from the receipt of the trigger until the data points that are entered into
the buffer are valid. (Delay time = Offset X Sample period).
Figure 5-4
258
OFFSET = -4096
4096 DATA POINTS
OFFSET = -2048
4096 DATA POINTS
TIME
ACQUISITION
TRIGGER
Pre-event and post-event triggering
Keysight Models 6811C, 6812C, and 6813C Programming Guide
OFFSET = 0
4096 DATA POINTS
9
OFFSET = 0 to 2
4096 DATA POINTS