Adlink cPCI-9116 Manual do Utilizador descarregar pdf (Página 56)

46 • Operation Theory

Post-Trigger or Delay-trigger Acquisition with re-trigger

Use post-trigger or delay-trigger acquisition with re-trigger function in

applications where you want to collect data after several external trigger events.

The number of scans after each trigger is specified in SC_counter, and users

could program

Retrig_no

to specify the number of re-triggers. Fig 18

illustrates an example. In this example, 2 scans of data is acquired after the

first trigger signal, then the board waits for the re-trigger signal (re-trigger

signals which occur before the first 2 scans of data is acquired will be ignored).

When the re-trigger signal occurs, the board scans 2 more scans of data. The

process repeats until the specified amount of re-trigger signals are detected.

The total acquired data length = DIV_counter * SC_counter * Retrig_no.

(DIV_Counter=4, SC_Counter=2, retrig_no=3)

cquisition_in_progress

Scan_start

D_conversion

Scan_in_progress

(SSH_OUT)

cquired & stored data

(6 scans)

eration start

ExtTrg

Figure 18: Post trigger with re-trigger

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Adlink cPCI-9116 Manual do Utilizador Página 56