writing data to the file of measure

Similar Questions

• storage, reading and writing data to the file

  Hello world

  I am new to the Labview and his community.  Asked me to acquire data on the measurement of the pressure using Labview.  I could build the code and got it working, but when I look at my data that has been collected, there no stopping point.  I just spent a lot of time looking at the data in the place where it begins and where it ends.  The question I ask is how to create a code to read the pressure, storage, in memory until there finishes, collect data and then to write in a .csv file.

  I use the NI USB-6009 case and hook upwards to ai0 and ai4.  See the attached code so uncertain.

  I want to record 100 data points and the system stops after these collection.

  Thank you

  John H.

  You have a certain time which means your VI will continue to run until you press your button to stop the loop.

  The DAQ Assistant is already set to 100 samples.

  Just delete the while loop!

• Writing data to the file when the trigger is activated?

  Hi all

  I'm quite new in lab mode, and I find it difficult to find a solution to this problem quite simple. I installed a gauge on a tank, and each time, he reached the limit of overflow of the VI should write all data to a file. I implemented my data tables, but I am struggling to find a way to have the VI writing the data when the specific trigger (the tank overflow) occurs. I'm sure the solution is quite simple, but was faced with this during a few days now so I decided to ask for help.

  See you soon,.

  Gasim

  Gasim wrote:

  Seems to work, but the program stops when the trigger activates and asks you a file name to write on and then reset the whole process. Is that anyway so he can write the data automatically, without any interruptions?

  Yes, simply son by the name of desired file in VI of file write. If a cable it won't entice.

• Writing data to the file trigger

  Hello

  I'm new to Labview and I'm having difficulty trying to make this work correctly.

  What I do is followed the release of a transducer and when it reaches a certain critical value I want to write data to a file.

  I have this part works fine, but I'm currently using a higher vi / equal to check the value against the flow of the instrument, so when the value is less than the critical it to stop recording.  I want to continue to save for a number of minutes after reaching the critical value.

  How can I do this?

  Look at using the Express VI of elapsed time.  So when the condition is met, it triggers the VI and it will keep logging data until the Express VI shows the elapsed time.

• Problem writing data to the file that is inside the SD card.

  Hello

  I am trying to write the data to a text file that was inside the SD card in my application.

  Everything worked well. If once I connect my camera to the PC via a USB port, then unplug the unit that also data are not added to the file system. Please can someone help me solve this problem.

  Thank you

  Schott Perfecto

  1 single source can access both microSD card.  So if the BlackBerry Smartphone is connected to a PC and mass storage mode, your application will not be able to access the microSD card.  Mass storage mode allows your PC watch the microSD as a drive on your PC.  It is configurable in the Options of the device.  You can set it to on, off or invites.

• How can I write snapshot of my data to the file measured every 5 seconds

  Hello

  I try to take a snapshot of my stream once every 5 seconds and write it to a. File LVM. I have problems with the VI "write to a measurement file. The pace at which it writes data to the file seems to be dictated by the 'Samples to Read' parameter in the DAQ assistant. I tried placing the VI 'Write in a file measure' within a business structure and the launch of the structure to deal with a "time up" VI. As a result only in a delay of 5 seconds before the insiders 'Write in a file as' VI. Once the VI 'Write in a file as' is launched, it starts writing at 20 x per second. Is there a way to change it or dictate how fast the exicutes VI 'Write in a file measure'?

  My reason for slowing down the write speed are, 1) reduce space occupied by my data file. (2) reduce the cycles of CPU use and disk access.

  The reason why I can't increase the value of 'Samples to Read' in the DAQ Assistant (to match my requirement to write data), it's that my VI will start to Miss events and triggers.

  I don't know I can't be the only person who needs high-frequency data acquisition and low-frequency writing data on the disk? However, I see a straight road to key in before that.

  The equipment I use is a NI USB DAQ 6008, data acquisition analog voltage to 100 Hz.

  Thanks in advance for your help

  See you soon

  Kim

  Dohhh!

  The re - set feature has not been put in time elapsed VI!

  Thank you very much!

  See you soon

  Kim

• Best way to record 50 kech. / s data to the file

  I'm reading a data acquisition data at a sample rate of 50 kech. / s and save it in a file. My application must run for at least a few hours. At first, I tried a model of loop of consumer-producer with a writing on measurement file Express VI, but he wrote the data too slowly, and my queue. Now, I'm trying to use the Write to VI file spreadsheet with or without a loop of producer-consumer model (see attached screws). Both seem to write data to the file, but no written records the number of datapoints I expect (the two have a lot less datapoints).

  What is the best way to write data to the file? Seems like a basic question, so if it has already been discussed in detail in another forum, or if there are examples of what someone could point me to, that would be appreciated also.

  Thank you!

  Hvea look at "stream directly to disk with TDMS in LabVIEW".

• Try to write data to the file, but error 200279

  I have problems when writing data to a file. 10 seconds in the recording process, I get the error 200279. I did some research on the subject, but I am unable to corect my code. I think I want to increase the size of the buffer, but he prefers, I suppose, to read the data more frequently. The way that I save my file is, before starting the VI, I attribute a location and name of the file (e.g. data.csv). The date and time is added at the end of the actual when file the I start to record the data (e.g. data_07-26 - 13_122615.csv). If the file does not exist, it creates a new file, and then adds the data of this file after each iteration of the loop. The reason why I did this way was so I don't have to worry about running out of memory, but apparently my code is wrong.

  

  

  I will include a copy of the faulty section of my code. Any help would be greatly appreciated.

  Thank you.

  Your problem is that the writing on the disk is slow.  It is pretty slow so it causes your DAQ buffer overflow and cause error and loss of data.  What you need to do is to implement a producer/consumer.  This will put the data acquisition and recording on the disc in separate loops.  This will allow data acquisition work at speed, that he needs to deal with incoming samples and writing on disk can run at all what pace, he can.  You send data from data acquisition to the loop of logging using a queue.

  You can also think about changing how you write to the file.  VI is constantly open and close the file, which is a very slow process if you do it inside a loop.

• write table 2D data in the file but the file is empty

  Hello

  I tried to write all reading of powermeter data to a file in two ways, I can see the output in the Arrais indicator data but when I write to "File.vi of the worksheet" or write to 'text file', the files are empty.

  Please help me.

  Try to remove the vi "STOP".

  I suspect, it prevents the main vi before the backup occurs.

  As a second point: given that you save data inside a while loop be sure you add the data from the file and not crash each time.

  wire that is a 'real' terminal 'Add file '.

  Kind regards

  Marco

• LabVIEW backup only 2 seconds of data in the file

  Sorry for this question of beginner, but after a few hours of searching for an answer and trying to solve the problem, I still can't understand.

  I use a DAQ Assistant vi, displaying the data on a chart in waveform, and to help to write it into a file as vi to try to save the data I collect (this is a while loop). A .tdm file is created successfully, but only about 2 seconds of data (25 k samples) are saved in the file. In addition, I write custom vi set to 'Add '.

  I need to save the data for the duration of my collection (between 2-20 min).

  I'm sure the solution is brutally simple, but any help would be greatly appreciated.

  Thank you!

  surffl wrote:

  Yes, I use the importer of CT in OpenOffice as provided for by the regulation.

  Do you trust to OpenOffice?  What do you get when you use the importer with MS Office?  I don't think you have a problem with your VI, but a problem with the importing program.  LabVIEW is certainly save more than 1 second of data in the file.  I thought that after each section headers might have caused and the file reading problem, but if you say settting it only write a header still causes problems with importing the data, I think that the problem comes from the importer.

• How can I change the creation date of the file through Labview 2012?

  I want to change the format of the data stored in text files, but I want the dates of the files to stay the same.  Currently, my program creates files with the new dates.

  LabVIEW to my knowledge has no native functions to do.

  You can use functions to get/set CreationTime, LastAccessTime and LastWriteTime .NET on Windows.

  See attached VI (LabVIEW 8.6)

• Error message on Windows XP, "Windows-Delayed Write failed, windows was unable to save all the data for the file.

  I use windows xp as the operating system. I bought the new 3G huawei data card. While surfing internet, between a pop-up is displayed

  «Windows-delayed write failed, windows was unable to save all data in the file C:\Documents and settings\new\Local Settings\Application Data\Google\Chrome\User Data\Default\Session Storage\004285.log.» The data has been lost. This error can be caused by a failure of your computer hardware.

  After this computer freezes and I have to restart my computer. Please help me how to fix this problem.

  The error basically says that he tried to write something on your hard drive and for some reason that unfinished write operation.  This could indicate a bad sector on your hard disk, damaged disk or a problem with your hardware.

  Whenever a problem involving a disk read or write appears, my first approach is to perform a verify operation of the disc to the hard drive.  Even if this is not your problem, it is a step of good routine maintenance. Run the disk check with the "/ R" or "Repair" option.  Note that the real disk check will be presented at the next reboot, will run until Windows loads completely, cannot be interrupted and can take more than a few hours to run depending on the size of your hard drive, the quantity and type found corruption and other factors.   It is better to perform during the night or when you won't need your computer for several hours.

  'How to perform disk in Windows XP error Cherking'

  <>http://support.Microsoft.com/kb/315265/en-us >

  HTH,

  JW

• Write delay failed unable to save all the data for the file $Mft

  Have a frustrating problem.  Help is greatly appreciated.  Learned the hard way and lost a dwg important issue which was unrecoverable.  Bought a new drive external hard seagate.  Could not back up the entire system with software pre-installed.  Download acronis true image home 2011.  Tried to backup system.  Receive error when trying to backup messages; 'Delay to failure of Scripture; Reading of the sector; Windows was unable to save all the data for the file $Mft. The data has been lost.  Have tried many fixes.  Unable to disable write caching method (grayed out / unclickable).  Played regedit 'EnableOplocks' is not listed to select.  Attempted to run microsoft 'fix it' and got the blue screen of death.  Short hair out of my head.  Suggestions appreciated.

  I don't know where Microsoft 'Technical support engineers' get their information.

  Write caching without a doubt "does apply to external hard drives", but it is usually disabled to prevent to sort the problem you are experiencing.

  I've seen several positions reporting to the same question that you do.  All of these positions were with SATA drives.  Is your Seagate eSATA drive?

  The disc is recognized as an external drive in Device Manager?  In Device Manager, go to the drive properties dialog box and click the policies tab.  An external drive should have two options: "Optimize for quick removal" and "Optimize for performance".  An internal hard drive shows the options as gray (with 'performance' selected), but there should also be a checkbox "Enable disk write cache" under the second option.

  What shows in your policies tab?

  If I understand correctly, "writeback" or "write behind" is implemented by disc material or its pilot.  If the option is not available on the drive properties > policies tab, I would suggest to contact Seagate support.

• Access to the data in the file permissions

  I have a html file that is generated by a third-party application.
  I want to give only the permissions to write data in the file, I don't want to give permissions to remove content.
  (it's not the file's content in the file)
  How can I put it please suggest me.

  As I said...  I don't think that what you want is possible.
  If someone can write (Edit) a file, then it can also remove all the contents of this file.

  It seems to me that you are looking for a software revision control... something that helps other people to make changes to a [copy of a] set of files, but gives a control authority the word to say as to when and if changes go in the direct copy.  It also regression to an earlier point in time.

  "Comparison of revision control software.
   <>http://en.Wikipedia.org/wiki/Comparison_of_revision_control_software >

  HTH,
  JW

• How to use the date of the file, when you download a file?

  Using the basics of 12 c, APEX 5.0 and IE11

  I am creating a file upload feature for my application.  I'm able to get the upload├⌐ file in my table, but one of my requirements is that I fill in a value in the table with the "file date".

  Is there an easy way to get the "file date" in the file being downloaded and fill a field for all records with this date?

  Tillie

  Tillie says:

  Using the basics of 12 c, APEX 5.0 and IE11

  I am creating a file upload feature for my application.  I'm able to get the upload├⌐ file in my table, but one of my requirements is that I fill in a value in the table with the "file date".

  Is there an easy way to get the "file date" in the file being downloaded and fill a field for all records with this date?

  That depends on your definition of 'easy '...

  The HTML5 File interface can be used to access date in browsers supportthe file was last modified.

  1. Add a hidden page that contains the file download point (P6_FILE_DATE in this example).

  2. create a dynamic action of change on the file upload question (P6_FILE):

  Event: Change

  Selection type: Agenda

  Region:

  Real Actions

  Action: Run the JavaScript Code

  Fire on Page load: NO.

  Code

  console.log('Get file modification date:')
  var fileItem = $x('P6_FILE');
  if (window.File) {
    if (fileItem.files.length > 0) {
      var file = fileItem.files[0];
      if (typeof file.lastModifiedDate !== 'undefined') {
        console.log('...lastModifiedDate for file \"' + file.name + '\": ' + file.lastModifiedDate);
        apex.item('P6_FILE_DATE').setValue(file.lastModifiedDate);
      }
      else {
        console.log('...browser does not support the HTML5 File lastModifiedDate property.');
      }
    }
  }
  else {
    console.log('...browser does not support the HTML5 File interface.');
  }
  

  If the browser has support for the File interface and lastModifiedDate property, the date, the file was last modified will be presented in the P6_FILE_DATE article in the form:

  Fri Jul 17 2015 10:43:44 GMT+0100 (GMT Daylight Time)

  You can analyze and convert your data load process to obtain a TIMESTAMP or DATE value according to the needs.