Adlink DAQe-2006 Bedienungsanleitung PDF herunterladen (Seite 52)

40 Operation Theory

Figure 4-7: Pre-trigger with M_enable=1

NOTE The PSC_counter is set to 0 in pre-trigger acquisition

mode.

Middle-Trigger Acquisition

Use middle-trigger acquisition in applications where you want

to collect data before and after a trigger event. The number of

scans (M) stored before the trigger is specified in M_counter,

while the number of scans (N) after the trigger is specified in

PSC_counter.

Like pre-trigger mode, the number of stored data could be less

than the specified amount of data (M+N), if an external trigger

occurs before M scans of data are converted. The M_enable bit

in middle-trigger mode takes the same effect as in pre-trigger

mode. 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 with (M+N) scans of data under middle-trigger mode.

However, if M_enable is set to 0, the trigger signal will be

accepted at any time. Figure 4-8 shows the acquisition timing

with M_enable=1.

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Adlink DAQe-2006 Bedienungsanleitung Seite 52