Adlink USB-1210 User Manual download pdf (Page 39)

Operation & Calibration 29

USB-1210

Figure 3-10: Middle Trigger

Pre-Trigger Mode

Pre-trigger acquisition is indicated when data is to be collected

before the trigger event. Acquisition commences once specified

function calls are executed to begin the pre-trigger operation, and

stops 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 trigger event by a specified

amount, as shown.

Figure 3-11: Pre-Trigger

Post-Trigger or Delayed-Trigger Acquisition Mode with

Retriggering

Post-trigger or Delayed-Trigger acquisition with re-trigger function

is indicated when data is to be collected after several trigger

events. An example is shown, in which N samples of data are

Time

ƔOperation initiates

ƔAcquisition initiates

Trigger

Data

ƔAcquisition stops

ƔData transfer to system begins

N samplesM samples

ƔTrigger event occurs

Time

ƔOperation initiates

ƔAcquisition initiates

Trigger

Data

ƔTrigger Event Occurs

ƔAcquisition stops

ƔData transfer to system begins

N samples

This data is

discarded

Only the N acquired

samples are

returned to system

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Adlink USB-1210 User Manual Page 39