Adlink DAQe-2006 Manuale Utente Scaricare il pdf (Pagina 51)

Operation Theory 39

When the trigger signal occurs before the first M scans of data are

converted, the amount of stored data could be fewer than the orig-

inally specified amount M_counter, as illustrated in Figure 4-6.

This situation can be avoided by setting M_enable. If M_enable is

set to 1, the trigger signal will be ignored until the first M scans of

data are converted, and it assures the user M scans of data under

pre-trigger mode, as illustrated in Figure 4-7. However, if

M_enable is set to 0, the trigger signal will be accepted any time,

as shown in Figure 4-6. Note that the total amount of stored data

will always be equal to the number in the M_counter because data

acquisition does not stop until a scan is completed.

Figure 4-6: Pre-trigger with M_enable=0

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Adlink DAQe-2006 Manuale Utente Pagina 51