lablc

@Tim: Thanks, you confirmed my concern. @drjdpowell: Thanks a lot, exactly what I was looking for!

On another note, I have to set-up an output signal. My acquisition device outputs 4.096V @ 15 mA and I need to control a 24V solenoid valve which draws 167mA with 144 Ω. Note: I have a 24V source and I need to open/close this valve once in 48 hours. Can I only use a 5V relay for this task or do I risk any damage to the acquisition device? Should I go with a transistor then? Any input would be greatly appreciated. Thanks a lot.

Thank you all. I followed your advices and I now have a decent solution!

Hi again, This is what happens when I run the .exe of my vi. Can someone tell me how to remove the grey parts around the main object? and how to auto-scale (up or down) the content of the vi to fit the screen (full view with any scrolling needed)? Look at the screenshot: What I get is on the left and what I'd like is on the right I tried to use Auto Adjust Front Panel Bounds.vi https://decibel.ni.c...t/docs/DOC-8643 by placing it in the main vi but I don't think it works. I use LabVIEW 2010. Thanks for your help!

Thanks Tim! I used a circular buffer as you proposed along with arma prediction to monitor the process. I'll get back to you soon!

Hi everyone, I worked on my VIs and I've made good progress! Thanks to all of you. There is one primary function of my VI that I need to work on though. As I mentioned above, I need to be able to automatically stop the VI when a certain value is reached. The thing is, this value will be different every time I run the VI. Since the signal acquired is periodic, I was wondering how it could be possible to monitor it (from the beginning of the acquisition or from the last X loops) and trigger the stop if any anomaly is detected (amplitude jumps up or becomes close to zero for exemple). Is there anything that could analyse the signal in that sort of way or do I have to manually set multiple relative thresholds? Thank you

Thanks to you both! I will look into your recommendations and get back to you!

Hi again, The idea of the VI is to 1- Open 2- Let the user set informations 3- Open the solenoid valve and start acquisition 4- Stop acquisition and close the solenoid valve 5- Save informations and data to file 6- Let the VI run awaiting next command (being either: change informations and file path, start new acquisition, quit the program) What should I do to be able to run the VI without using acquisition? just let it be in standby When the VI runs it ask for the file path (1). How could I make it so that people have to browse for it whenever they want before beginning the acquisition. I want the user to be able to enter different informations (string type), modify them, then click FIXER to set all the values (2). I get missing assignment to tunnel but what should I write in the False case? What should I do with (3) if I want the time Heure de fin estimée to be updated while the variable detected frequency is updated within the loop? If I use ContinuousSamples (4), is the number of samples any useful? If I use multiple channels, lets say 2, are they both going to be displayed on the measurement (5) ? How can the values on the graph be cleared once the acquisition ends and data is saved to a file? Is (6) a proper way to store data for further writing to (9) ? Else, what should I change? Where should I put the start button (7) so that it starts the acquisition process? I currently have three ways (8) to trigger the stop (number of cycles, threshold or manual). None take errors in the loop in consideration. How could I add that? Here at (9), I need to add the acquisition data (numeric) along with the informations previously set (strings) (2) with to the exported file. Is append function the correct way to do that? In the end case (10), I need to add an analog outpout of 5V DC. Should I use a waveform with 5V offset and no amplitude? Is my usage of local variable correct in the while loop stop condition and in (3)? Thank you so much in advance, all comments and suggestions are more than welcome!

Thank you very much for your input! I'll clean it up, add a few things and get back to you!

Hi, I'm new on this forum and I would need some help with a labview project. What I need to do is acquire data (sinus form) and detect if absurd data (in this particular case, making the amplitude greater) is acquired and stop the machine if that's the case. What would be the best way to do that? (Some existing VI express for that usage?) I attached a screenshot of the acquisition loop. All comments are welcome since I'm still learning. Thank you!