write records to a file

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• DASYLab how to write data to a file every 15 minutes

  Hi all

  I use dasylab and datashuttle/3000 to record data. What I want to do is to write data to a file every 15 minutes. I use the milti-file, which can write data to the file diffenret, but how do I control the timing, as the journal data every 15 minutes automatically.

  The other problem is that I use FFT analysis of the frequency spectrum. How can I determine the value of frequency where the peaks that happens.

  Thank you

  Write less data in the file that you have collected requires the reduction of certain data.

  There are three techniques to consider.

  With an average or an average of block - both reduce the data by using a function of averaging, defined in the module. To accomplish the reduction of data, choose block or RHM mode in the dialog box properties, and then enter the number of samples/data values that you want to reach on average.

  Average - when you reduce the data, you also should reblock data using the block length of the change in the output parameter. For example if you enjoy at 100 samples/second with a block size of 64, the average module configured on average, more than 10 samples will take 10 times longer to fill a block. The initial block represent 0.64 seconds, the output block represent 6.4 seconds at a sampling rate of 10 samples/second. If you change the size of output in one block, the program remains sensitive.

  Average block - average values in a block against each subsequent block, where the average is based position. The first samples are averaged, all second samples are average... etc. The output is a block of data, where each position has been averaged over the previous blocks. This is how you will be an average data FFT or histogram, for example, because the x-axis has been transformed in Hz or bins.

  Second technique - separate module. This allows to reduce the data and the effective sampling rate jumping blocks or samples. For example, to reduce the data in 1000 samples / second to 100 samples per second, configure the module to keep a sample, jumping 9, keep one, jumping 9, etc. If you configure to skip blocks, you will not reduce the sampling frequency, but will reduce the overall amount of data in a single block 9, for example. It is appropriate for the FFT data or histogram, for example, to have the context of the correct data.

  Finally, you can use a relay and a synchronization module module to control. For example, to reduce a sample data every 15 seconds, configure a generator module of TTL pulses for a cycle of 15 seconds of time. Connect it to a Combi trigger module and configure it to trigger on rising and stop the outbreak directly, with a trigger value after 1. The trigger output connects to the X of the relay command input.

  In addition to these techniques, you can change the third technique to allow a variable duration using a combination of other modules.

  Many of these techniques are covered in the help-tutorial-Quickstart, as the data reduction is one of the most frequently asked questions.

  In regards to the FFT... use the module of statistical values in order to obtain the Maximum and the Max Position. The Position of Max will be the value of the frequency associated with the Maximum value. The output of the statistics module is a single sample per block. Look at the different FFT sample installed in the worksheet calculation/examples folder.

• list box given to the .csv file using write on the worksheet File.vi

  Hi, I use the write on the worksheet File.vi to write data multicolumn ListBox to the .csv file. If I do record from Excel, the pop-up window shows as an attachment. And data listbox are too different.  I want the data displayed in the first line not the second row (third photo).

  Thank you for your help.

  Before making your Save As in Excel, change the cell formatting of number. This should avoid the scientific notation conversion before you re-register.

  Or just use Notepad to display the file instead of Excel.

• whenever I try to, the open, Tunes, I have, get, message:, the file, "Ditties", is, on, to, locke d, drive, or you do not, write, permissions, for, this, file., Suggestions, to get on the past, this?

  whenever I, try to open it, Tunes, I have, get, the, message:, the folder, "Ditties", is, on, to, locke d, drive, or you do not, write, permissions, for, this, file., Suggestions, to get over the past, this??

  How about you post that again without commas and maybe then I'll read it?

• I am trying to record an mp3 file, but firefox does not allow me to save... it allows me to read the file but not download and asave to my computer. How can I enable to save the mp3 files on my computer?

  I am trying to record an mp3 file, but firefox does not allow me to save... it allows me to read the file but not download and asave to my computer. How can I activate the Firefox save MP3s on my computer?

  Go to Options > Applications tab > MPEG Layer 3 audio(audio/mpeg) image search > use the "Save file" option on the menu drop down.

• Satellite P500/01R reads the data, but cannot write data on CD files

  I recently bought a laptop Satellite P500/01R. I am able to read a data CD, but can't write data on CD files. The CD is read/write.

  Any ideas?

  Hello

  Have you tried different burning software?
  I m using Nero and in my opinion one of the apps better combustion.
  Here, I can choose between CD, DVD, DL or Blueray (only possible if the CD/DVD drive also supports this).

  Have you also checked diffΘrents CDs from different manufacturers?
  You should do this since not all disks are 100% compatible.
  I had several problems with different CD or DVD in most of the cases it was a compatibility issue, I tried TDK and this kind of drive is compatible with my CD/DVD drive
  I m using the standard of R.

• Write data to text file generates the error

  Hi all

  I need to write data to a file using TestStand and I configired the entrance and outside like below, but I get the error message like ' an error occurred 'Write' calling in 'ITextStream' of 'Microsoft Scripting Runtime' [error Code:-2146828234].

  I followed the same procedure for reading text that works very well for me.

  Hope others might have faced the problem / or I do something wrong.

  Do what is necessary.

  

  Found problem while opening a file I used IO Mode ForReading instead of ForWriting.

  Unnecessarily the thread created, but then hope this can help someone later when they deal with a particular issue.

• How to read/write tdms 2.0 files with the TDM C DLL?

  Hello

  How to read/write tdms 2.0 files with the TDM C DLL?

  How consequently the datas in interlaced with the TDM C DLL mode?

  Thank you

  Confirmation: TDM C DLL always wrote the file in TDMS version 2.0.

• 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."

• I want to create new files every 2 seconds of "write in a measurement file.

  I am a beginner of LabVIEW; I want to create new files (with similar names like test_01.txt, test_02.txt...) to 2 seconds interval using "write to a measurement file.

  In fact, it should be a question. Join the program that you have problems with. The subject was discussed several times as you should have found examples when you did your research.

• Record to the file of the measurement at will

  Hello.

  I'm new to LabView and so far it has been easy enough to learn this software. I like really I. I use a USB-1208FS MCC to measure signals from the real world and enjoy to LabVIEW.

  The thing is I want to be able to save to a file of measure at will. That said, when I press the Start button, it will start measuring but DO NOT save data to the file measure until I touched another button, a "record" button This is when I want to save the data. Is it possible to implement in LabVIEW? Because as soon as I start sampling that he recorded in the file of measures.

  Should which functions I use? I'd appreciate any help.

  Thank you!

  Pretty simple with a case statement.

  I recommend you:

  3-hour course

  6 hour course

• Concerned by several users, reading files interfering with write access to the files

  I have a LV MY application that will run in several places/computers. Each will create a single HTML report and update frequently. These HTML files will be accessed and combined by another application of LV in a new HTML file that will be updated frequently. All HTML files could be opened by a user at any time in a web browser.

  What concerns me, it's HTML reports could be avoided by a user, or the application of the combination to be written by the app MY? If the user or application combining a box open report she always written by the app MY? It goes the same for the app combining prevented to be written if a user has his open output HTML code?

  Each HTML file can only be written by an application but read by many potential users and/or an app.

  All programs run independently and asynchronously. Each application runs on its own computer and files all exist in a network location.

  Can I do this by controlling all users file privileges? If anyone has read only permissions except the written computer the HTML file that will be enough?

  MES Manufacturing Execution System is

  Thank you

  Judd

  I guess as long users see the reports with a web browser, it should be no problem.

  Browsers Web do not "lock" a file when they open it like Word or Excel because web browsers are not and should not modify or change the file somehow.

  If only one person could display a web page to internet time would not work as we know it.

  But if you're worried about it use LabView to lock files during execution of the program. Only in this way, users can open the file as read-only if they use something that can change the files. If you use the standard LabView open file read/write vi passing a file reference, then this will be done automatically.

• Write to the spreadsheet file

  Hello

  I try to write in a spreadsheet file.

  There are two things that I try to do what does not the current .vi.

  1. ask a name of file to outside the while loop. For the moment, this happens inside the while loop.

  2. Add to the file (by setting true) does not work as each time the while loop is iterated in this example, it asks me for a new file name. Shouldn't it just add to the file without having to ask a new file name on each iteration.

  Thank you

  If you do not specify the path to the file and then writing on a spreadsheet file asks for the file.  That just the way the function works.  If you go to the range of advanced functions of file, you will find a file dialog box function.  Put outside your loop and pass the path resulting in the loop and writing in the spreadsheet file.

• Write to spread generates file of journal of type unknown file in windows 7.

  Hi all, I use the Vi 'Write in a spreadsheet file' for writing data in text files. These data can be read by any text editor, such as Notepad in MS, or excel. The problem is that

  Windows detects these files as being of an unknown type, and I have to explicitly tell windows what program to use to open these files. In addition, for some reason any the

  Box "Always use the selected program to open this kind of file" is grayed out. So I can't assign a file type to these files.

  Has anyone else encountered this problem? Do you know how to fix it? And what type of files 'Write in a spreadsheet file' generates?

  Thanks for your help,

  What extension do you use to create your files?  I agree that it seems that you do not provide a file extension.  Add a ".txt" to your file names before writing and Windows will play more nicely with you.  Or if you use a comma as separator, use ".csv".

• write to the .xls file hourly

  Hello everyone!

  Feel free to help !

  I have a small question about writing to the file. So basically I have to read 10 temperatures by 10 Thermocouples of a storage tank. I want to write in an excel file every hour. But the waveform is active all the time. So I don't want the wait loop every hour.

  Help, please!

  I have read several forums about him but couldn't really find any solution!

  Thank you!

  Here is a version of 2013.