Adlink USB-1210 User Manual download pdf (Page 40)

30 Operation & Calibration

acquired after the first trigger signal, after which the USB-1210

awaits the next re-trigger signal (re-trigger signals occurring

before the N samples are completed will be ignored). When the

re-trigger signal occurs, another N samples are performed. The

process repeats until the specified number of re-trigger signals are

detected.

Figure 3-12: Post Trigger with Retriggering

Gated Trigger

Gated-trigger acquisition is indicated in applications where you

want to collect data when trigger events are set to level high/low,

and hold acquisition when trigger events are set to the opposite

level.

As shown, after the operation starts, the first scan of data is imme-

diately acquired when the trigger signal is deasserted and paused

when the trigger signal is asserted.

The remaining A/D conversions are not performed until the trigger

signal is deasserted again. The process repeats until the specified

amount of data is acquired.

Figure 3-13: Gated Trigger

Time

ƔOperation initiates

Trigger

Data

ƔTrigger event occurs

ƔAcquisition initiates

N samples N samples N samples

Time

ƔOperation initiates

Trigger

(Active High)

Data

ƔAcquisition begins

ƔAcquisition stops

ƔAcquisition begins ƔAcquisition stops

ƔAcquisition begins

1 2 ... 35 36 37 38 39 40 41 42 43 44 45 ... 53 54

No comments

Adlink USB-1210 User Manual Page 40