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Found 12 results

  1. Hello Network, I am writing array of timestamp in TDMS file. "TDMS Write.vi" generates an error after calling this VI as follows. Group Name = "DUT T1" Channel Names = "DUT T1_Time" Please let me know if anyone has any suggestions. BR Aniket
  2. Hi all! I'm new to the forum and I have a strange issue with reading TDMS custom properties with Labview. Creating user properties is working fine using TDMS Set Properties.vi, but I can't read them with TDMS Get Properties.vi. I can read the "standard" properties, and also I do see the properties in DiAdem (dataportal and using script) and also in Excel when I use TDM(s) importer. The property names are not listed when calling TDMS Set Properties.vi without the property name and data type terminals connected. There is no simultaneous file reading or writing. I solved
  3. Hello I am trying to save TDMS files that ideally contain the following: - 3 xy graphs (each containing two 1d arrays) - 1 waveform The problem i'm running into is that when I convert the xy graphs to waveforms, the x-axis is converted to time, which isn't real or useful to me. I've attached screenshots of what the XY graph should look like VS what it ends up looking like with the waveform. How to I make sure the x-axis is preserved so that I can save to TDMS? Edit: VI is included & pictures have been updated to better represent my code.
  4. Hi all, I am supporting a legacy application in LV2010, running on a realtime PXI controller. The application is throwing occasional TDMS errors, typically -2505, when I do TDMS Flush or TDMS Close operations. The description of this error is simply "LabVIEW failed to write data to the TDMS file," which doesn't really tell me what happened. Every time I write or flush, the same quantity of data is being written, and most of the time, it operates as expected. After iterating for anywhere between 2 and 14 hours, though, it eventually throws the error. Does anyone know in more detail wh
  5. Question: I'm trying to determine the 'best' way to structure my data when storing to disk. My data comes from a variety of different sensor types and with quite different rates - e.g. temperature data (currently) as a 1D array of temperatures and a timestamp [time, t1, t2, ..., tn] at maybe 1 Hz and analog waveform data from load cells at data rates ~O(kHz). I also want to be able to read back data from previous experiments and replot on a similar graph. Reading threads on this forum and at NI I'm uncertain if I'll be better pursuing a set of TDMS files, probably one per sensor ty
  6. Hello, I'm using the 9229 and borrowed a community example to log 4 voltage inputs to TDMS. I need to output RMS voltage on channels 1&2 and the wavform on channels 3&4. Essentially what I've done is averaged channels 3&4 using the same # of samples that the RMS is averaged, that way I'm able to make sure they are time synchronized (see code attached). Another advantage doing averaging the samples is that I am reducing the amount of data to analyze later. When i compare the TDMS read results to the # of samples in the TDMS file there seems to be a discrepancy in time
  7. I'm currently investigating using TDMS as a data storage for a new measurement method. In our routine, we sweep up to 3 outputs (with X, Y and Z points each) and record up to 24 channels so we have XxYxZx24 datapoints. We create the following: Up to X data points for 24 channels of data interleaved in the first dimension (multichannel 1D) Up to Y times this first dimension (making the data multichannel 2D) Up to Z times this second dimension (making the data multichannel 3D) So in a sense, we create 4D data. Trying to use our old method of storing the data in memory fails quick
  8. Hi, I am investigating the possibility of using TDMS files as a kind of giant circular buffer that would be too big to fit in a live 2D array of some sort. Of course the other reason is to have those data saved for when the application restarts. A single location in the application will be responsible for writing in the file. This would consist of a loop that writes either one or a few samples for all the channels at each iteration. I successfully achieved this with good performance by setting the data layout input of the Write function to Interleaved. On the read side, few locatio
  9. I am accessing a TDMS file from two VIs running in parallel. One VI is responsible for opening the TDMS file and writing a property. The second VI is responsible for reading said property. Here's where things get interesting...The second VI cannot find the property while the first VI has the TDMS file open unless the first VI also writes data to the TDMS file. I've created a few VIs (attached) to help illustrate the problem. Any ideas as to what is going on? I would have expected properties to be available as soon as they are written. Read TDMS Property Names.vi Write TDM
  10. Hi Guys, Simple question. I assume that some responses may be a simple "Yes" or "No". Can TDMS files have different file extensions than.tdms, if the file is created by LabVIEW?? Second question, what is the difference to TDMS v1 and v2?? Thanks for your help. Brenton
  11. I am having an issue with memory when reading a TDMS files and converting to an array to write to a spreadsheet file. If I look in task manager when I run the VI the first time it allocates a bunch of memory and only a small fraction of that memory is freed after the VI is run. Even closing the VI and project doesn't free the memory, I have to exit out of LabVIEW before the memory is freed. Basically what happens is I open the VI and in task manager I see the memory increase (duh). Then I run the VI and it increases greatly (up to around 400,000 K), but when it finishes running only about 10
  12. I have a TDMS file where I would like to log waveform data. But, I am only logging when certain conditions are met. This could result in some condition being met, then the condition going away, then coming back etc. For example, if I want to log when the RPM exceeds a value, I will start on this exceedance. But, maybe RPM drops back below a threshold so I stop logging. Now the RPM comes above the exceedance again, but if I log my waveform to the same channel, it doesn't account for this new t0. Does anyone have any thoughts on work arounds for this? I could make a "timestamp" channel and extr
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