9205 trigger

[julien03]

why my signal moves happens over time when it is a trigger (hardware use ni9172 ni9205)

[BenjaminR]

Hi,

Can you give us more details about your problem (soft version, what are you doing, ...)?

[julien03]

I use the version 8.5de LV
my problem is that the declenchement does only once at the launch of the stain. in fact I wish he starts at each loop (while)
I find a solution (VI attachment), but I find it too slow

[Brad_K]

Hi julien03,

When you commit a task that uses analog triggers on the NI 9205, NI-DAQmx delays to allow the NI 9205's trigger circuitry to settle. To speed up your second VI by moving this delay outside the loop, you can use DAQmx Control Task.vi to commit the task outside the loop. One of the examples that ships with NI-DAQmx demonstrates this: Acq&Graph Voltage-Int Clk-HW Trig Restarts.vi.

Brad

[BenjaminR]

Hi,

You also have an example here to know how to use Control Task VI.

[julien03]

Hi.

my problem is not the frequency of sampling but time loop while, too slow. I lost precision.

[BenjaminR]

Hi,

To increase your time loop put out of your While Loop the Start and Stop Task VIs. Then your time loop will your Sample Clock Rate dependent.

[julien03]

it would be possible to have an example

[BenjaminR]

Here you have a picture about what I described above.

Message Edité par BenjaminR le 05-20-2008 10:56 AM