CBLé System Guidebook 65
Triggering with Prestore
Trigger Location Point
When a trigger and a nonzero prestore percentage are used, it may not
be obvious where the trigger point occurred. The following will help you
determine the precise location of the trigger point.
Prestore % Trigger Point
0 The first sample in the list will always be the first sample after
the trigger point.
100 The last sample collected by the CBL will always be the first
sample after the trigger point.
1 to 99 The first sample after the trigger point is identified by the
following equation:
TLN
PN
B=−+
−+int
100
2
where:
T = The location in the list retrieved from the CBL of the
first sample after the trigger event.
L = The actual length of the list returned by the CBL (see
next page).
N = The number of samples requested in
CMD3
(an integer
from 1 to 512, but only 1 to 99 is recommended for the
TI-82).
P = The prestore percent requested in
CMD3
(an integer
from 1 to 99).
B = The Data Begin specified in
CMD5
(usually this is 1, but
can be changed by
CMD5
to be an integer from 1 to
512).
int(PN/100) means the integer portion of the number in the
parenthesis.
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