Write to file

[ddub]

Thanks for the discussion.  pistonbones, it would be helpful to see the block diagram of your final solution just to tie everything together.  Would you post it?  Thanks.

[pistonbones]

Give me a few days I will post it when I get a free moment. Hopefully it helps you out.

[samNIproblem]

Hello all,

I have been trying to make my Labview write data away at different times. I am using a more complex VI, but scaled down to a simple one because I want to get the hang of this. I am using the default settings (1000 Hz and 1000 samples) which makes my excel write down every 0.001 s.

In attachment are 2 pictures ( a more complex one and a simple one). The more complex one works and takes a sample every 10 seconds. I tried to remake this one (because I had to add some channels), I first did it step by step. This didnt work. Then copy past, still measurements every 0.001 s. This trick with the `wait ms` goes to the `enable` port of the measurement file

So I made the simple one with the suggestions above, and it still doesnt work. I followed all the remarks about tick the mark about resetting the clock. I have a feeling there is a fundamental thing I dont understand well enough to finish this thing.

Anyone that can help me? I just want to take samples at interval times of 1s, or 10 s or .... Not at every 0.001 second. 

[samNIproblem]

My DAQmx settings in attachment as well and the timing settings as chosen in the Measurement and automation explorer. It says 300 samples, but I changed this to 1000 in the block diagram (post above).

[samNIproblem]

I also attached a recording button to the measurement block. This is green all the time, showing continuous measurements.

[Dennis_Knutson]

It seems senseless to post your ' complicated' one. It shows nothing of your data acquisition task. Posting just images of Express VIs is also a waste of time but at least you explain that your sample rate is 1000/sec. That, of course means you take a sample every .001 seconds so it seems the recording is exactly correct.

[samNIproblem]

Thanks dennis for the fast answer, you are right. in attachment the two programs. Like you said, I played arround with the Hz and changed it to 1. Now I get my measurements like I want in the Pyrolysis copy trial secundo file ( for example every 4 seconds)

BUT in the pyrolysis updated 5 august 2013 test, I get a measurement every 10 seconds. While the Hz is at 1000. 

What is the difference, I think there are more elegant ways in doing this? I understand there is some overriding of the 1000 no? Id like to get a hold of this...

[Dennis_Knutson]

Offhand, don't you think taking the mean of 1000 samples is going to reduce the number of samples somewhat?

[samNIproblem]

Yes denis, I could do that.

Any idea why those 2 programs give different sampling times, since their samples per channel and sampling rate is the same? Trying to get a hold of it.

Thanks!

[Dennis_Knutson]

Throws hands up, shakes head, and walks away.