Signal Processing

[engineering_in_agony]

I could use some help here I am trying to take a signal from a tektronix oscillioscope which is really stright forward. However I need to take data from that signal at a certian sampling frequencies. Then I need to write those samples to a file for signal analysis. HELP PLEASE

[altenbach]

Is this a continuation of your earlier thread?

[engineering_in_agony]

Yes this is a continuation of my earlier discussion. So far what I have gotten is labview to recognize the signal and record it and display it on a wave form graph. I have attached a picture. An idea struck me that why do i need to maniplutate the signal coming in rather just manipluate how often the signal is recorded. Is that possible, very sorry as I am a new user to labview and I am learning this from the start.

[Bob_Schor]

I haven't read your other threads (presumably about the same topic -- not very polite behavior), but I can't imagine noone has told you that it is (almost) useless to submit screen-shots of your code.  If you really want us to spend our time trying to help you, you need to provide us with your code in the form of an attached VI or an attached Compressed Folder (.zip) of your LabVIEW Project.

Bob Schor

[engineering_in_agony]

I completely understand and allow me to apologize for my behavior. It was not my intent to cause any trouble. Here is a copy of my LabVIEW file that I using. 

So far I have been able to collet a signal and display it however I am having trouble collecting a continious signal and I have not been able to figure out how to take sampling rates and record those to a excel or text file. 

Thank you for you understanding and all of you help

[Dennis_Knutson]

You haven't tried doing a save. I told you about the function that will write the waveform data to a file in your other thread. For continuous operation, you need a loop around the read waveform. You will have gaps, though. You also need to connect the error wires. Haven't you looked at the example that comes with the driver (Help> Find Examples)?

[engineering_in_agony]

I didn't realize that there was an example, I have made some progress. I have inserted a File I/O that saves the wave form data. Is there a way to set the sampling rate in that File I/O?

I am really sorry everyone, I am sure that it seems as though I have ignored what you have said to me it took me a while to find the function that you were talking about. This is my first time using LabVIEW and any data collection software of this type. I do what to express my gratatude for your help.

[Bob_Schor]

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@engineering_in_agony wrote:

This is my first time using LabVIEW and any data collection software of this type. I do what to express my gratatude for your help.

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Have you reviewed all of the tutorial material described in the upper right corner of the Forum?  Have you tried to find tutorials on Data Acquisition in LabVIEW (there are probably additional tutorial material out there)?  Have you done all of the exercises and taken all of the "exams" in the Tutorials?

Try to get a sound grounding in the Basics before byting off a complicated project.  It doesn't make sense to start explaining Design Patterns to you if you don't understand Data Flow, when/how to use a While Loop, why the Error Line is important, etc.

Note that you should expect to spend a few hours with the tutorial material.  This is actually pretty reasonable ...

Bob Schor

[Dennis_Knutson]

The sample rate is stored in the file. The sample rate is set by configuring the horizontal time base and the number of samples.

[engineering_in_agony]

So how do I set the horizontial time base?  And how do I set the number of samples?