Transfer TDMS file cRIO 9076 PC locally using Labview code problem

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  Hello

  We were faced with a problem when opening files TDMS connected using a LabVIEW, PDM Viewer (the vi in palette Advanced TDMS) application, or by creating a new PDM vi player. The recorder app is built using TDMS functions in palette file.

  When the TDMS files are everywhere higher than 500 MB or the application hangs or crashes. It can sometimes give full error memory.

  I browsed the forum and found the screws to split large TDMS files into smaller files and then open them. The other option is to use NI DIAdem. Currently, we use the option of the tiara. We do not want to modify the application to split the files into smaller sizes.

  I'd like to understand why this is happening for files of these formats. I can easily play TDMS of 100 or 200 MB files.

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  request explanation

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  Freelance_LV wrote:

  [..]

  What I want is to know if upgrade to Win 7 and LV 64-bit will solve this problem, without cut it files each time, or use the TDMS vi Viewer.

  More likely since the channel data is placed in a very wide range and fragmentation of memory makes it very hard on 32 bit with LV 32-bit OS. Another thing that could be a problem on your 32 bit LV: display data as it creates a copy of data. So maybe the original data of the channel can hold in memory, but tries to display it sweeps away memory.

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  As I wrote already, a generic application 64 bit triggers the limited "insane" values depending on the operating system like Windows 7... still, there are limits.

  Norbert

  EDIT: The link of Windows 7 go to the physical memory table on the whole system. This does not reflect the virtual memory available to a single process. Scroll down to the table "and address space limits of memory" a virtual memory figure that can be assigned to a process 64-bit on Win7 x 64. The value is 8 to...

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  OK, so once you are able to create files byte write and read bytes from existing files, you can move forward.

  I suggest the basic method is to have the user specify a source file on the source PC, and a folder on the destination computer.  Then find the size of the source file using the number 5.  Divide this number of size by the number of bytes that you want to transfer to the times.  The series pads are usually around 32 k (if I remember correctly) in order not to exceed that.  Now start to send data by reading a number of bytes and this string output wiring to the feature of writing VISAS.  On the side of destination, you will want to monitor the serial port for bytes and read when they arrive.  This string of yarn to the writing of the function of binary file to add them to your destination file.

  This is the basic outline of how to do it.  He needs to not to overload him write and read buffers on the serial ports.  Initially, you can use delays on the side sending to make sure that the side reading has enough time to digest.  To make things faster, you can bring in a control of flow.

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  Happy wiring,

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  PrimeTest Automation

• Why the TDMS file is bigger that we should

  Hello

  I write data rate simultaneously two analog channels to TDMS file to sample 10 kHz using the capture of data OR PCI card - 6111 12-bit.

  Simply calculate:

  10000 samples per second x 12 bit x 2 channels is 240000 bits per second = 30 kbytes/s = 1.8 MB per minute.

  I have 766 seconds takes long recording, so it should be: 30 kbytes/s x 766 second = about 23 MB.

  But my TDMS file takes 123 MB! and I have problem with these large treatment TDMS files, for example I have no memory of enogh for analysis of FOIA. Where is the problem?

  Best regards

  Kacper

  DFGray,

  You're right, I wrote the values of voltage in volts as waveform (DBL) of DAQmx, but number DBL is 64-bit, that's why my files was so great.

  Now, I write not adjusted data represented as I16 (16-bit integer), and everything is ok.

  It is possible to further reduce the size of the file using property DAQmx Channel node - http://zone.ni.com/devzone/cda/tut/p/id/3697#toc1

  Kacper

• (Huge and abnormal) TDMS files problem

  Hi all

  The TDMS file created by my prog of labview. size of 300 MB and takes a long time to open in tiara and sometimes even system crashes. After that, I managed to open the file and simply delete the last line, tiara functions normally without interruption (scroll operation works normally). How you guys think might be the problem?

  Best regards

  LaxG

  First thing I would try is the defragmentation of the file (use the TDMS Defrag feature in LabVIEW).  I know there are other tricks to make it load faster, but I don't know where my links are at the moment.

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