Control correctly 3 heartbeats at 3 meters of material using PCI-6601

Hello

It is a sequel to a previous post

http://forums.NI.com/NI/board/message?board.ID=40&message.ID=7914#M7914

as for control a PIV of LabVIEW rig using a PCI-6601.

The task requires the production of pulses in three outings of the counter. The Q-switch laser, to a double pulse (which is resolved in the previous post), while the other two are simple impulses. It is important to be able to control with precision the difference in width and pulse between pulses.

As far as I understand, I need to configure timers to start and then run from the material without other software entry

I tried using the "initial deadline" option when creating counter channels, but it is very innaccurate (probably that uses the software?). Similarly, using the lag in call loops option does not produce a time delay (and requires the use of a meter as a synchronization source, leaving me without enough counters)

Below is a basic diagram time for a single iteration, keeping in mind that this must be repeated in the range of 100-1000 Hz, approximate pulse width (PW) would be 2 microseconds and delays in the region of 500 microseconds.

I need to be able to define

delay of Cam and laser delay with precision (and the pulse widths must be easy in theory)

Sorry if I forgot something important and thanks for your help

Kind regards

Joe

Hi again Joe,

We could just trigger all out 2 meter (pulse FPS which seems to start the acquisition as a whole).

CTR 2 would be a continuous pulse generation (at the rate we want to re - triggered the entire process).

CTR 3 would be a unique generation of impulses of retriggeralbe, with an initial delay.

CTR 0 and 1 are a bit difficult in the context of the rest of the application.

I think that the suggestion I posted in the previous thread should work fine by CTR 0 triggered with an initial delay.

Otherwise, we could do an output meter redeclenchables finished, but if I remember correctly there are specific behaviour with the initial delay of the finished products redeclenchables counter that could give us unexpected results (I would find the link but ni.com seems to be down at the moment).

I won't be back in the office until next week so I don't have any material to try this, but I think that should help you get started in the right direction at the moment.  The desired behavior should be achievable, but it might take a programming smart everything for line lift correctly.

Using a trigger external or not should not affect the programming of the double line impulse which is the most difficult aspect of the application.

-John

Tags: NI Hardware

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