Measurement-computing Data Acquisition Systems rev.10.4 Bedienungsanleitung PDF herunterladen (Seite 77)

DaamNShotRearm -- Once triggered, this mode continues the acquisition for the specified post-trigger count,

then re-arms the acquisition with the same acquisition configuration parameters as before. The automatic re-

arming of the acquisition may be disabled at any time by issuing the daqAdcDisarm function. Other than the

re-arming feature, this mode works like DaamNShot. Upon re-arming, data collection will only be reinitiated

when the trigger event re-occurs after the previous acquisition post-trigger count has been satisfied.

The DaamNShotRearm command can only be used with WaveBooks.

DaamInfinitePost -- Once triggered, this mode begins continuous acquisition until explicitly terminated

by the daqAdcDisarm function.

DaamPrePost -- This mode begins collecting the specified number of pre-trigger scans immediately upon

issuance of the daqAdcArm function. The trigger will not be enabled until the specified number of pre-trigger

scans has been collected. Once triggered, the acquisition will continue collecting post-trigger data until the

post-trigger count has been satisfied. Once the post-trigger count has been satisfied, the acquisition will

automatically disarm itself and terminate.

Daq 2000 Series devices, DaqBoard/1000 Series devices, and WaveBooks

[with WBK 30’s] in cycle mode both return the exact pre-trigger amount of

data specifies. Other devices record data from before the pre-trigger event

(i.e., all scans from arming to disarming). See daqAdcBufferRotate for more

details.

Relationship to Trigger Start/Stop Events

The daqAdcSetAcq function sets the style or mode of the acquisition. However, it does not specify trigger

start events, nor does it specify trigger stop events--although it does specify stop conditions (if those stop

conditions are scan counts or infinite). Specific trigger start and stop events are defined by other functions:

Trigger start events (EventA) can be defined using daqAdcSetTrigEnhanced and

daqSetTriggerEvent.

Trigger stop events (EventB) - can be defined using the daqSetTriggerEvent.

The following table shows the relationship between trigger event definition and acquisition mode parameter

settings for possible acquisition configurations:

Desired Acquisition

Without Pre-Trigger Scans

mode preTrigCount postTrigCount

Trigger acq on EventA and stop on scan n

after trigger

DaamNShot Ignored n

Trigger acq on EventA and continue

indefinitely until disarmed by application

(daqAdcDisarm)

DaamInfinitePost Ignored Ignored

Trigger acq on EventA, stop on scan n

after trigger, then re-arm to trigger on

EventA (repeat until disarmed)

(Note 1)

DaamNShotRearm Ignored Ignored

Trigger acq on EventA and stop on

EventB

DaamInfinitePost Ignored Ignored

With Pre-Trigger Scans mode preTrigCount postTrigCount

Take m pretrigger scans, start acq on

EventA, and stop on scan n after trigger

DaamPrePost m n

Take m pretrigger scans, start acq on

EventA, and stop on EventB

(Note 2)

DaamPrePost m Ignored

Note 1:

WaveBook products only.

Note 2: Applies to DaqBook/2000 Series, DaqLab/2000 Series, DaqScan/2000 Series, DaqBoard/2000 Series,

DaqBoard/1000 Series, and DaqBoard/500.

Programmer’s Manual 908594 Daq API Command Reference 4.2-21

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