Adlink USB-2405 Bedienungsanleitung PDF herunterladen (Seite 46)

36 Operation

Post-Trigger Acquisition Mode (no retrigger)

Post-trigger acquisition is indicated in applications where data

is to be collected after a trigger event, as shown.

Figure 3-9: Post Trigger without Retrigger

Pre-trigger Acquisition (no retrigger)

Collects data before the trigger event, with acquisition starting

once specified function calls are executed to begin the pre-trig-

ger operation, and stopping when the trigger event occurs. If

the trigger event occurs after the specified amount of data has

been acquired, the system stores only data preceding the trig-

ger event by a specified amount, as shown. Note that N must

be equal to or less than 8k samples for all analog input chan-

nels.

Figure 3-10: Pre-trigger Mode Operation (valid trigger only)

Time

ƔOperation

start

Trigger

N samplesData

ƔTrigger Event Occurs

ƔAcquisition start

ƔAcquisition stop

ƔBegin to transfer data to system

Time

ƔOperation start

ƔAcquisition start

Trigger

Data

ƔTrigger Event Occurs

ƔAcquisition stop

ƔBegin to transfer data to

system

N samples

This data is

discarded.

Only acquired N

samples will be

transferred back to

system.

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Adlink USB-2405 Bedienungsanleitung Seite 46