TDMS times

Similar Questions

• To the bottom of the sample

  Hi all

  I need to re - sample a 1KH 1MH tdms file, it seems that it is possible with the help of "Sample Compression" but the point is the entrance to this block is a single signal and my tdms file consists of a few different channels a beginner I don't know how to get my file PDM signals and connect them as inputs to the block of "Compression of the sample!

  I would really appreciate if someone can help me with some advice.

  Thank you very much

  Navid

  Read your file TDMS using the open functions then reading PDM.  Here you can specify the offset and length to read.  You can then put this into a while loop get 1000 samples at a time stopping when there is an end of file error, or your reading returns less then 1000 samples.  Take these samples of 1000 and get the average of them.  Then write this single data point to the TDMS file as a new group.  Then close the file TDMS times all 1000 pieces have been processed.  Then you will have a file with the raw data in the existing group and decimated in the new data.  You can also choose to save them in a new TDMS file but I find that to do this way because it would be all in one file.

• Time Division Multiplexing (TDM) Using USRP s 2943 with synchronization

  Hello

  I have two 2943R USRP.  One of them is transmitter another is the receiver. I wonder about the moment on USRPs division multiplexing. How could I implement this system? On the first slot of the Trasmitter USRP channel 0 will send the signal, receive USRP channel 0 will get the signal, on the second time slice Trasmitter USRP 1 channel it will send the signal, receive USRP channel 0 will receive the signal again. This process will goes in the order. So in detail, Ch0 of USRP0 will send the first niche hourly Ch0 of USRP1 will receive, Ch1 of USRP0 will send, Ch0 of USRP1 will receive again after the third slot Ch0 of USRP0 will send the signal. This process will be contiue until I stop VI. Signals will be displayed on the receiving party and release will signal where USRP0 Ch0 and Ch1 USRP0.   Example of synchronization is present on examples of NI Labview 2014 USRP on PPS trig. But I could not find example vi or a document on the TDM with synchronization.  You give me advice? How could I overcome this problem?

  Best regards...

  Hello again,

  I found an example on the community or my research: https://decibel.ni.com/content/docs/DOC-23677

  Can I use this paper for my purpose? Is this useful? Could you give me advice please?

  I don't have much experience on 2943R. I am trying to learn... How could I change this document for my research?

  Best regards...

• Tiara taking much time to load the TDMS 700 MB to the data portal

  I'm trying to load a file of 700 MB TDMS in DIAdem, sampling frequency of 4 channels 10 Hz for 4 days. When I drag the file in the data portal, tiara freezes, its on a 2GB machine, a file that is located on the desktop, not running other programs and it is went 50 minutes without being able to load before I did leave. seems to work fine, although on smaller files. I was wondering if this sounds normal and if anyone knows a way around him.

  Yin

  Hi Yin,

  You can defragment the TDMS file loading in DIAdem programtically:

  TDMSFileName Sun: TDMSFileName = "C:\Dokumente und Einstellungen\GrRomaiS\Eigene Dateien\LabVIEW Data\ttt.tdms.
  Call DataFileLoad ("" & TDMSFileName & "","TDMS","" ")

  Please note that in this case, you will need to replace at least"<" and="" "&"="" in="" your="" filename="" (not="" contained="" in="" example="" code="">

  In addition, we have incorporated a fix in DIAdem 2010 SP1 that will speed up loading files TDMS (for example containing explicit time strings). We hope to see DIAdem SP1 this year...

• Time stamp incorrect TDMS?

  Whence the timestamp in the TDMS file format? I assumed it was the date and time system, but appears not to be the case.

  I have a vi that capture data, a few treatment and then saves some parameters using the PDM format. I've collected and saved 20 seconds of data (programmed using a timer), but when I open the file PDM, the timestamp is 0 to 41 seconds. I repeated it several times and it seems to be a sensitive relationship with the duration indicated in the PDM file and the actual time. I checked also double by saving the system clock and he's still out.

  I need set a synchronization setting before using the TDMS format?

  
  

• Excerpt from several sections of tdms file times

  Hello

  I found an example VI to extract either a certain index point or time point x samples and then and create a smaller file of PDM.  I'm trying to modify it to do it several times at specific times in the file.

  The pretext is the following.  I'm recording 33 channels to 2700 Hz sampling frequency.  I can do this up to an hour or more.  Needless to say that this made for a HUGE data file.  I want to pass through and with a list of interested time (for example: 10, 20, 40, dry etc.) extracts the value of 7 seconds and do one more small file DDHN that we can now move on and do data analysis more on.

  It seems to work for the first data file, but it comes with a warning of 'End of file', then stops for the following files.  I enclose my VI for your convenience.

  Thank you.

  I guess that the error comes from reading of PDM. If read TDMS has no entry for group and Terminal channels, it will iterate channels per group. I think that you can solve the problem by offering the group entries and the channel for TDMS read.

• Time Stamp Offset end playback TDMS

  I am having a problem with a PDM file playback and display a graphic in the shape of wave in LabVIEW.  My table of waveform display always the time with a negative offset of 18 000 samples.

  Who make it simple, let's say I'm sampling to 1000 samples per second, and I connect my PDM data. When I read that PDM and visualize my graphic waveform data, the chart display data read from DDHN 18 seconds earlier that the registered wf_start_time, set a deadline for the PDM.  If my wf_start_time is 08:00:20.000 AM 12/02/2014, then my waveform displays a start time of 08:00:02.000 AM 12/02/2014.  Even if I taste 4000 samples per second, my start time is disabled starting 4.5 seconds earlier.

  I put my Xscale.offset = wf_start_time it reads properly, but the start time on the waveform table is always false.

  Because I'm dealing with large TDMS files (500 MB +), I sometimes decimate the data to view it due to problems of memory. Here, this problem occurs again.  If I decimate the data to display only 1 out of every 10 data points, this offset is more changing by a factor of 10 x. ranging from 18 seconds to 180 seconds.

  Is this some sort of gap of stamp UTC/system clock time or something else?

  Looks like that I thought about it.  I copy - paste a previous screw waveform graph on a whim, I created a graph of waveform from scratch, and the lag problem has been eliminated.  It must have been an option or shift created in there that I couldn't see or modify.  But it's good now.

• TDMS of MDF time stamp conversion error / storage date time change

  I fought it for a while, I thought I'd throw it out there...

  Let's say I have a file TDMS which has a channel of labview time stamp and thermocouple 2.

  

  I load in DIADEM, I get this:

  

  Perfect!  But now let's say I want to save the PDM as a MDF file so I can see him in Vector sofa.  I right click and save as MDF, perfect.  I started couch and get this:

  

  The year 2121, yes I take data on a star boat!  It seems to be taking the stamp of date/time storage TDMS as starting point and adding the TC_Timestamp channel.

  If I change the channel of TC_Timestamp to 1, 2, 3, 4, 5, 6, 7 etc... and save as MDF, I get this:

  

  Very close, 2012!   But what I really want is what to show of the time, it was recorded what would be the 10/09/2012.

  The problem is whenever I do like recording, date storage time is updated right now, then the MDF plugin seems to use it as a starting point.

  is it possible to stop this update in TIARA?

  

  Thank you

  Ben

  Hi Ben,

  You got it right that the MDF use written the time of storage to start MDF that is updated by DIAdem when writing time. We are working on this and will return to you, if there is no progress.

  To work around the problem, you can try convert TDMS MDF in LabVIEW storage vis.

  Something like the following, you can write your start time of measurement to the MDF file.

  

  Hope this helps,

  Mavis

• Concatenate with DIAdem TDMS files, depending on the time

  This question is in French and English.

  Hello

  I'm trying to find a way to concatenate/merge several files TDMS analog measurements with DIAdem 2012, in order to have more than one file. I be provided with attachment 1.

  I am beginner in DIAdem and don't know not the language of the script code. En 986KO on this forum, I found the script 'Import data from several Files.VBS use', and changed lines 17 and 18 not 'csv' by replacing "tdms" (as it was stated on another topic on the forum). This script also appealed to "concatenate groups."

  The problem is that the TDMS files contain several groups (the slots on frame of measures Canada) each containing several different channels. This script concatenates so each group and the result makes more sense the script to modifier is certainly "CONCATENATE Groups", but in what way?

  Thank you

  Olivier

  ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

  I'm trying to find a way to concatenate/merge several files TDMS analog measurements with DIAdem 2012, in order to have at the end only one file. You can find these files with my mail 1.

  I am a beginner in tiara and do not know the language of the script code.

  By searching on this forum, I found the script 'Import data from several Files.VBS use' and changed lines 17 and 18, replacing 'csv' by "tdms" (as demonstrated in another topic on the forum). This script also uses "groups of concatenate.
  The problem is that the TDMS files contain several groups (pointing to the slots on the frame measurements), each containing several different channels. If this script concatenates each group and the result is meaningless. I think the script that needs to be changed is "CONCATENATE Groups", but how?

  Thank you

  Olivier

  Hi Oliver,.

  Try to run the script you downloaded once for each group and encodinng group to load in the assignment of "ChannelSet" in line 10 using the index group, like this:

  ChannelSet = "[1] / *" or ChannelSet = "[2] / *".

  I just found out that this example breaks in 2014 DIAdem because the 'DataFileHeaderAccess' command has been relegated and replaced by a new.  I need update soon.

  Brad Turpin

  Tiara Product Support Engineer

  National Instruments

• Read error-getdatatype TDMS

  Brief history on my project.  I have a PXI system configuration to read signals from DSA devices, Series S, and an encoder.  I use matlab to make calls to functions in libraries NI DAQmx and nilibddc.h.  I collect the data and the flow of data on the disk with the ability to view data during the acquisition.  Acquisition occurs for almost a minute plus 37 channels to 100ksamp/sec.  So the. TDMS files are quite large.  I synchronize my systems by some sort of configuration of the hybrid master slave device.  I use auto-sync in all types of similar devices, and to synchronize the different types of devices, I use the sample clock and start to trigger a DSA device to synchronize my other devices.  Since I use the automatic synchronization of the. TDMS files can have anywhere between 1 or 20 channels in a single file.  This makes a very large file and Microsoft Excel import does not cut because of the limitation on the size and the time it takes to load.  So I use the nilibddc.dll to read data from files which seems to be fairly smooth so far. I did not attempt to read a file with a minute of a data value but the worst case I can read the data file chunks at a time so I'm not terribly worried about it.  My problem occurs when I read my file data .tdms containing my encoder data.

  The part where it inhibits is is my function calling for DDC_GetDataType.  Now when I use my code to read data from the analog .tdms file it works well and does what I want it.  The error I get for my counter of the signals is an error unexpectedly (-6204.)  Now what is interesting is when I use labview 2009 on another computer, I can read the files without a problem.  I'm guessing that my labview 2009 uses different libraries however.  For example, when I read the file in labview, I go to the range of functions, choose file/o, PDM in streaming and use either read the .tdms or PDM Viewer function.  When I'm on my main computer, I use a call to the DIAdem connectivity library, that I downloaded from OR. Microsoft excel importer also seems to be hung in the same place (getdatatype).  I found this to inspect the log file, it creates when I try to read it.  Any help would be appreciated.  I have attached the error log I get the .tdms microsoft importer.  I've also attached a sample file .tdms with the position of encoder in it data.  If trying to open outside of labview, don't be fooled if she tells you that there is no data available.  It is, by using labview 2009, you can read all the 500ksamps without problem.  Using PDM viewer or reading tdms atleast.  Thank you.

  Hello-

  I wanted to preface what follows with the fact that I assume that you are using the TDM C DLL downloaded here.  If this is the case, the following should solve things for you - if not, please let me know where you got the ddc library of.

  Unfortunately, the TDMS dll which is downloaded from the link above is a little outdated and contains the bug you reported.  I created an internal action query to update the download with the version the most recent available to us.  In the meantime, I have attached the tdms dll needed to solve the problem for you.  You should not use the attached dll to replace the dll in ".\Dominonilibddc\dev\bin\\tdms_ebd.dll".

  A potential problem here is if you use the merge modules included to redistribute your product.  If you are, we will need to get some updated modules as well merge - please let me know if this is the case for you and what is the level of urgency.

  Please let me know if this does resolve the problem for you.

  Thank you-

  NickB

  National Instruments

• record channel times of order data NI_DataType

  I'm trying to replicate some features of selection of the control Data Logging property in the VeriStand workspace in a Labview application (I wish I could get just the VI for control of the workspace).  In the control of the registration of the properties-> channel category data the time channel can be selected.  When I select absolute time he records the system path = 'targets, controller, channels, Absolute System Time. "  But I have one property TDMS NI_DataType = 68.  If I manually select the channel (add channels) we obtain a = 10 NI_DataType.  The difference seems to be that the NI_DataType = 68 has the well formatted time (m/d/Y/min) while the NI_DataType = 10 at a time in a large number that represents the number of seconds.  The NI_DataType is read-only.  How can I get the formatting nice NI_DataType = 68 to be registered like that?  This post is treated?  If so how to do that?

  Thank you!

  I have found that the Group of channels TDMS (NI_VS Data logging API.lvlib) type def that gets wired for the new Data Logging Specification.vi has a def of time type of the channels Options which allow channels different time to be configured and named.

• TDMS wf_start_time with milliseconds

  How can I include information millisecond of time of waveform information in my TDMS file?

  Resemble my timestamps: 17/10/2016 08:59:34.000 AM

  Hi sez!

  The DAQmx property do not support to set the properties in the PDM log file.

  

  The only thing you can do is create a file and write the start time property in this file. The DAQmx driver opens this file again and log data in the file.

  

  Basically, you can do it, but I prefer the solution of low level with the TDMS screws indicated in the post before.

  Best regards

  Wolfgang

• TDM file more than TDX

  I run a batch script that downloads data, analyzes and stores them for later use, but the size of the TOC file is approximately 2.5 MB, when the size of files TDX is only 0.5 MB.  It seems strange that my meta data is ~ 5 x the size of my real data.

  Any idea of what could happen here and suggestions to fix it?

  There is an available compression method that only works for the TOC header.

  Option Explicit
  
  Dim targetfile: targetfile = "C:\temp\target.tdm."
  
  Call DataFileSave ("" & replace (targetfile, "&", "&") & "zip", "CT" ")
  
  

  which is available only by using script.

  Be aware that this will end with a header of tdm aompressed and a file binary tdx.

  But it might help in your place if you really need the smaller headers.

  Old version of tiara not will also be able to read these files.

  You will also pay an additional load with a little time. Check yourself.

• root properties in the connected data store: error when accessing the date/time storage

  When you browse the properties my connected data store I get an error message when you try to read the value of the property of 'storage date/time': object doesn't support this property or method.

  Here is a minimal example:

  Dim oMyDataStore, MyProperty, oMyProperties
  
  Set oMyDataStore = Navigator.ConnectDataStoreByParameter ("TOC", "" & "C:\Program Files (x 86) \National 2012\Examples\Data\Example_data.tdm" & "" ')
  
  Set oMyProperties = oMyDataStore.RootElements (1). Properties
  
  For each MyProperty in oMyProperties
  
    Call MsgBoxDisp ("property name:" & MyProperty.Name & + "\n"&"property value:" & MyProperty.Value "")
  
  Next

  Why can I not access this particular property by default?

  Hi Phex,

  for the date/time properties, an object called UsiTimeDisp is returned. This object allows to that extend features of service as access to each part separately (day, year, hour, seconds,...) of your date/time value. If you want to print the value of time with MessageBoxDisp, you can use the VariantDate this object property.

  Your code might look like this then:

  Dim oMyDataStore, MyProperty, oMyProperties
  
  Set oMyDataStore = Navigator.ConnectDataStoreByParameter ("TOC", "" & "C:\Program Files (x 86) \National 2012\Examples\Data\Example_data.tdm" & "" ')
  
  Set oMyProperties = oMyDataStore.RootElements (1). Properties
  
  For each MyProperty in oMyProperties
  
    MyProperty.DataType = eTime Then
  
      Call MsgBoxDisp ("property name:" & MyProperty.Name & + "\n"&"property value:" & MyProperty.Value. ' ") VariantDate)
  
    On the other
  
      Call MsgBoxDisp ("property name:" & MyProperty.Name & + "\n"&"property value:" & MyProperty.Value "")
  
    End If
  
  Next

  I hope this helps.

  Good day

  Eva

• view tdms on tiara

  Hi all

  I followed the example below backup graphical spectrum and time in PDM file format.  However, tiara not properly plot the data.  Is there anyone know how to use Diadem to plot these data PDM.

  http://forums.NI.com/T5/LabVIEW/TDMS-2D-array-won-t-append/TD-p/1872743

  I have attached the TMDS data file and screen shot of how Diadem display my data.  Please help if anyone knows how to use Diadem.

  Thank you

  An alternative you can use the following script to replace the values from 0 to NoValues and use this channel to draw.

  Option Explicit
  
  Call Calculate ("Ch(""[1]/FREQUENCY_NV)" "") = Ch(""[1]/FREQUENCY"") * (1 + CTNV (valequal (Ch(""[1]/FREQUENCY""), 0))) ")"