Effectively change the continuous sample mode sample mode finished

9188 chassis, modules (HAVE them), 9 of Labview

I want to acquire continually (and display) given at a fast rate to date, and then when a 'trigger arms' State is detected, the switch to finished hardware, triggered task with pre-trigger samples with a minimum loss of perceived as update rate.

What is the best way to do

Thank you

Collin

I started my answer a long time ago while waiting for a reboot and am just finally getting back to it.  I see that you got another another answer in the meantime.  On the outbreak of reference, here is another link that might help some: Acq suite w / Ref Trig

I did have not tinkered with reference trigger a lot, so not sure what is meant in the link above about the task being an acquisition over 'the end'.  Maybe the task continues to fill the buffer just before there about to overwrite the first sample of pre-trigger?

In any case, my original thought the whole thing was on another track.  If the trigger Ref works for you, it'll be easier.   But if Ref trigger causes the acquisition of stop * and * you really need to keep it going permanently, then consider the things below:

-------------------------------------------------------------------------------------------

Passage of the continuous sampling done will require the judgment and the reprogramming of your task, and you will have a 'blind spot' of data loss, while what is happening.

An approach that I think is to stick to a sampling WAS continuous, but also set up a counter task that can count it HAVE examples of clock and capture on the trigger signal.  The captured value of count will be HAVE it taste # when the trigger has occurred, and then easily post-process you your data HAVE to find the subset that represents your data before and after the desired trigger.

Here is an excerpt of what I mean 2012:

-Kevin P

Tags: NI Hardware

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