write the measurement file

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• Delta t do not update using write in the measurement file

  I write data to a file that is collected with a dt = 0.005 sampling interval (but no hardware DAC.   I would like to save the data in a file LVM with a column, the timestamp and the second data column, and I use the Express VI 'Write in a file measure' in the following Labview code snippet:

  

  The value of the local variable dt is 0.005.   The delta T is saved in the saved file, but the timestamps don't change the initial value of o, o:

  

  What Miss me?

  Thank you

  John

  I wouldn't really call it a workaround solution. This is the expected behavior.

  Build and write like a table and your waveform will be saved correctly.

  If you are going to write a point at a time, all you have to do is to keep track of what you want to use when you build your unique point to t0 and wiring waveform.

  EDIT: Is the column name 'Untitled' bug your client at all? It would have upset me. You can fix it by set the attribute of waveform for "NI_ChannelName."

• Write to measure file by default to 'save to a file.

  I am using the 'write to Measurment queue' to do a series of files - but as soon as I hit ok it is default to 'save to a file. Even without running the VI he defines simply himself back. I have attached files what it looks like before you hit OK, the settings, and what happens when I close.

  Maybe it's a bug?

  Also, if you can see, I don't want the file to be called testdata__, but there is no way to change the prefix of the file because the area is grayed out. Any way to change this either?

  What version of LabVIEW are you using?

  LV2009 has a few bugs with writing custom file Express VI.

  See this thread for more information.  http://forums.NI.com/T5/LabVIEW/write-measurement-file-save-to-series-bug/m-p/1226104

• write to measure file vi bug?

  Hello.

  Looks like I might not be the first with this.  I suspect...

  http://forums.NI.com/NI/board/message?board.ID=170&message.ID=234485&query.ID=1018110#M234485

  I still after that I don't know how many hours days etc., failed to do this work.   I had to go and do a 'real' job, as it is called here for a few days or so, don't play no not with the software, however, is that asked me to do.

  This is all about 'Writing as Data File' express VI comes with LV 2009.   Used as Cree in the document "Getting started with LabView" infamous.   Running on XP Pro, perfectly (until tomorrow "Patch Tuesday" maybe.)

  Writing on a data file Express VI:

  It works the first time, no mistake, a lot of data, the first time entry to activate is made true, even if I leave it is true, thankfully, it creates several KB of the planned just as data file.   Do activation enter False, writing to the file STOPS, again just as expected.

  New do right and produces an error (the chemin\nom of the input etc file is still there and equally valid that it has always been) and no data is written in the file, despite no changes to the inputs of the VI (with the exception of the data of unique signal value)

  However, if give you him a new one (same file path\new) file name, and then he would write in the new file every time.  It's without blocking the program as a whole.

  I can navigate between two files just fine.   But it just will not write to a file first, that it is "Re" active after a deactivation is used.  Re entering the same path\filename is not a solution.  It must be another to wake up the thing.

  As it is, it's worse that useless for any serious application, and as the other party, I can't imagine how he got through the mill of QA.   As the other party, it is sold on the fact that it is supposed to be easy to plant items/icons on the comic and join the dots to make things work.  While largely true and there are a lot of good stuff here, there are a lot of things that exist for travel upward and confuse him.   The help is too small.  I get the phone call and email to other types of NOR, but no solution to the problem.

  If you want a copy of the VI program all the so-called fine, just someone tell me what and how to download it on this forum (very strange).  I can upload images, but I can't find a way to "attach" files, etc.  Or to work through the Getting Started document (as I have now three times!) and you will find the problem.

  Oh, and I seem to have lost the indicator as to how much
  days of "evaluation" I left.  I can't find a switch to make it appear that
  Gray more splash screen.

  Kind regards.

  Dave Baxter.

  Technical Director:

  AR - UK Ltd.

  I think that there is certainly a bug.  I can see where it is going, but I don't know why he got that way.  This VI shows the bug in LV 8.6 also?

  Right click on the entry to measurement file Express VI.  Inside that is a Subvi, called ex_subFileWrite.vi.  It is a clone of a reentrant VI, so it is quite difficult to follow execution through it.

  Somehow the first time through she builds and checks the file name based on what comes into it.  She that stores into a shift register.  If you clear the writing to a file, the shift register is stored which is not a constant of path.  Later, when writing is reactivated, it uses just the path (not a path) from the shift register, rather than back in the name of the input file.

  Exactly where this is really out there, I'm not sure, because express VI makes such a spaghetti with inter twisted code for managing all types of files and in writing the conditions and a lot of manipulation of file file path.

  I think the reason that edit the path and even change back works is that there is an initial control if the path is the same and if it is different, it works with the new file name, if it isn't, then it works with what was stored in the shift register.

  A person of OR should look deeper into this substantive code of the Express VI and try debugging.  I think that there is a bug.

  But here's a work around.  Use a select statement to send the correct file name if the writing is enabled, or a file path empty if it is not enabled.

  

• How to set a record time of a capture or write in measurement file

  Hello

  I worked on it for longer I should have without asking for help.

  I am tiring to save a capture 10 to 15 sec of my contact information to a write to a file of measures.

  The work of capture, but I have no idea how to attach a timer to stop capturing after 10 to 15 seconds.

  Ideals would help considerably.

  I have amp using labview 8.6 and a card entry with an entry of the SCB-68 interface PCI-6220.

  I worked on the problem of my previous post, but I'm not sure how to go on this subject on this one.

  Thank you

  Richard

  Hi Richard,

  I would like to make use of the express VI of elapsed time, the code might look like the attached VI.

  Let us know if you encounter any problems.

  Thank you

  Scott M.

• Change the decimal point by point in the writing of the measurement file

  Hello

  I use writing to the extent of the vi file to save data. I can't read the text file in Matlab, I guess that is because the decimal separator is a comma.

  Y at - it than a simple means of LabVIEW to set the decimal separator to be the point instead of the comma? (in writing to measure file vi)

  now, the data is like this 56 897 but I like it in the format 56.897

  Thank you

  Hi simo,.

  Uncheck "use localized comma" in Options-front help?

• How to find the sampling frequency to read the measurement file

  Hello

  I would like to find/extract the sampling frequency of a .lvm file.

  Right now I am using the VI 'read file of measurement' and my data charge fine and all, but I need the frequency of sampling for certain calculations.

  I know the header of the file .lvm that the sampling frequency is 1613Hz, but I want to get this automatic information from the open file .lvm.

  Tried to find an express vi that could give me the answer, but I could not find a

  I'm sorry if this question already answered, but I could not just to find the answer.

  I hope you understand what I'm doing!

  Thank you

  Kind regards

  Tommy

  The timing is part of the production of signals information. Never use the functions of the Express, but you can use DDT to and convert to one of the data types of waveform. Waveform components then turns the dt.

• usefulness of reading the measurement file express vi

  Hello

  I found reading file express vi measure in LV7.1 does not read from the beginning of the file when you run it the second time. Instead, it resume from where it left off last time. Usually, the user would read the entire file measure each time. So when you try to read the second time, it will show an error window saying that it has reached the end of the file (because he was reading the entire file first).

  I wonder how useful to resume from the last stopping point is? Is there a way to start over each time that the VI excute it?

  I'm sure that's how reading file measure works 90%. Whenever she is called in a single run of the application, it will start off the coast where it was stopped. You will need to work with the low level screw to get what you want to do.

  This Express VI works in a similar way the screws and the following functions:
  Open/create/replace file
  Read text file
  Read binary file
  Read the spreadsheet file
  File dialog box
  Scan to file

  And, you can always use the node to set the file Position to set the position at the beginning of the file.

• Write the measurement data in text file every 10 seconds for a duration of 2 seconds, creating a new file every time.

  Greetings,

  I'm working on an application for the acquisition of data that runs constantly and need to record data at intervals of 10 seconds for a duration of 2 seconds.

  On each interval recording, I have to create a new file that contains a number of journal in the name of the file (Test_1.txt, Test_2.txt,...);

  and add to the current time and date on the header of the file.

  My question is how can I do this with what I have so far?

  The attached vi is a notion of what I am trying to accomplish. The application also has the DAQmx read functions in the vicinity while loop.

  and a few manipulations of data. Apart from the main loop, I create and launch tasks DAQmx.

  Thank you for your help.

  Best regards

  Matej

  Hello

  Thought this one myself.

  Here is the solution, if anyone needs something similar.

  Best regards

  Matej

• Added a timeout for a write to measure file operation?

  Hello

  I have a question that I think will produce a very simple and direct answer, but I do not know how to approach it.  I write data to a file of measures LabVIEW and am allowing writing custom Subvi file with a simple Boolean button (i.e. when we click the button data are saved and vice versa).  Instead of having to click the button a second time to stop recording data, I would like that it resets automatically after a certain period of time so that all my files end up being the same size and scale.  I'd like to think that all I have to do is use one of the time functions (functions-> programming-> Timing), but I don't know which.  Any help will be appreciated.

  Thank you

  bsteinma

  That's where.  That's what the button labeled 'Save' does.  You just need your file write code in the structure of matter as well.

• prompt user with write to measure file VI

  Hello

  I have a Labview VI who is writing data to a file, currently the file name (path) is written in the section "Filename" of writing on a file measure VI.
  Is it possible that a user can be prompetd for a file name?

  As in,.

  time each time I run the VI a diaglog box appears, which allows the user to type a specific file name (say Run1 or Run 2, etc...). The user types the name of the file must match the name of the file where the data is written (using writing to the file as VI)

  I enclose my vi of the trial.

  Thank you

  lana89

  There is a function of file dialog box, which you can use.  Can be found in the Express-> entry-level or advanced-> palettes files IO.