Adlink cPCI-9116 Bedienungsanleitung PDF herunterladen (Seite 51)

Operation Theory • 41

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

converted, the amount of stored data could be fewer than the originally

specified amount of DIV_counter * M_counter, as illustrated in fig 12. This

situation can be avoided by setting

M_enable.

M_enable

is set to 1, the

trigger signal will be ignored until the first M scans of data are converted, and it

assures user of obtaining M scans of data under pre-trigger mode, as

illustrated in fig 13. However, if

M_enable

is set to 0, the trigger signal will be

accepted in any time, as illustrated in fig 12. Note that the total amount of

stored data is still always a multiple of DIV_counter (number of samples per

scan) because the data acquisition won’t stop until a scan is completed.

cquisition_in_progress

Scan_start

D_conversion

Scan_in_progress

(SSH_OUT)(pin47)

(M_Counter = M = 3, DIV_Counter=4, SC_Counter=0)

cquired & stored data

(2 scans)

eration start

ExtTrg(pin46)

Figure 12: Pre-trigger with M_enable = 0 (trigger occurs before M scans)

1 2 ... 46 47 48 49 50 51 52 53 54 55 56 ... 97 98

Keine Kommentare

Adlink cPCI-9116 Bedienungsanleitung Seite 51