Concatonate TDMS file data to live data

I am monitoring 20 or 30 channels at any given time and storing all data to a TDMS file (LV 8.6). At any given time we are only displaying 3 channels on a waveform chart. The chart displays 5 minutes of data. say for the first minute I am viewing channels 1, 2, & 3. Then I switch over to 4 - 6 but in addition to the live data coming in I want to see what has happened since the test started a minute ago (or up to 5 minutes ago), as if I had been viewing these three channels all along.
What I have tried is to read the stored data from the TDMS file, copy the most recent data (up to 15K samples = 5 min at 50Hz). Then I take the live acquired waveforms, break out the array of Y values, concatonate with the Y values from file and rebuild the wavform. But it isn't workin. Seems like it should but I don't know what is wrong.
Any ideas?
Lawrence M. David Jr.
Certified LabVIEW Architect
cell: 516.819.9711
http://www.aleconsultants.com
[email protected]
Attachments:
extendedWaveforms.vi ‏15 KB

well I tried using the "ignore attributes" property, both above the 'value' property, and below (top down ordering - didn't make any difference). Also I verified that the data is being concatonated; normally we are adding one point to the plot every 50mS, when we toggle to a different set of channels, the Y component of the waveform is not an array of one element but of (in this shot anyway) over 9000 elements. the screne seems to flash with a block of data and then the plot resumes filling 1 point at a time from the present time stamp. Maybe I can set an attribute of the x axis to be an earlier timestamp based on the number of points in the Y array?
Lawrence M. David Jr.
Certified LabVIEW Architect
cell: 516.819.9711
http://www.aleconsultants.com
[email protected]
Attachments:
propertyNode.JPG ‏11 KB
probes.JPG ‏45 KB

Similar Messages

Can I save a TDM file without its TDX data?

I have hundreds of data files that have been sorted (by date). In certain cases, I want to analyze subsets of this data in particular groupings. I would like to save these groupings in a TDM file but I don't want to another copy of the bulk data. However, I notice that if I save a TDM, it automatically saves the TDX, and I'm not sure it's possible to save/open a TDM without its same-name TDX file. Does anyone else have a similar need and/or know of a data management method that can suit my need?
Thanks.
Solved!
Go to Solution.

Hmm... But it seems that the TDMS file simply puts all the information in a single file and, in the end, is almost as big as the TDX file. What I'm trying to do is only save the meta data but not the bulk data, since I already have a copy of the bulk data in another set of TDM/TDX files.
Maybe I'm asking the wrong question. Here is a simplified example of what I'm trying to do:
I have several (let's say, 6) original TDM files. Each of these original TDM files have 20 or more channels. I've created a new TDM file, pulling out only 5 of the channels from each of the original TDM files but organizing them into 6 groups corresponding to the original 6 TDM files. From this new TDM file, I've created a TDR file where the plots are based on the 6 channel groupings. Due to this TDR to new TDM association, I think I need to save the new TDM. However, that means I now have a new giant file that contains duplicate data from the original TDM files. I don't want this duplicate data. Being very new to DIAdem, maybe I'm just going about this the wrong way because I haven't figured out the "right way" to accomplish my needs. Can anyone advise?

TDM file with multirate interleaved data?

I am developing a datalogging application that samples several channels at different rates and I need a way to graph the data quickly. After figuring out that reading my own custom file format byte-by-byte takes a long time in LabVIEW, I started looking at TDM files.
I found the TDM Header Writer VIs, and it looks like I can just create a header that points to my binary data. However, I have several channels which can be sampled at different rates. For example:
Channel 1 data
Channel 2 data
Channel 3 data
Channel 1 data
Channel 1 data
Channel 2 data
Channel 1 data
Channel 1 data
Channel 2 data
Channel 3 data
Is it possible to create a header for data stored like that? Or would I need to include data for all of the channels at the highest frequency? ...
Channel 1 data
Channel 2 data
Channel 3 data
Channel 1 data
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Channel 3 data (dummy)
Channel 1 data
Channel 2 data
Channel 3 data (dummy)
Channel 1 data
Channel 2 data (dummy)
Channel 3 data (dummy)
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Channel 2 data
Channel 3 data
I am thinking about creating 2 files: one for low speed data (0-100S/s) and one for high speed (100-1000S/s). I would simply insert the dummy data for channels that aren't the highest speed.
Am I going about this the right way? Is there an easy way to store the data the way I _really_ want to (all the channels interleaved without dummy data)? Any ideas or suggestions would be greatly appreciated.
Thanks,
John

John,
Have you considered splitting the data as it is acquired and writing each channel to it's own binary file and then using a TDM header file to relate the acquired channels?
That would be how I would approach this problem but as I haven't tried this before I can't tell you how successful it will be (yet).
I'll try looking into this some more and post again when I have some better information.
In the meantime here are some resources that you may or may not have seen:
Introduction to the LabVIEW TDM Header Writer VIs
LabVIEW TDM Header Writer VIs
Introduction to LabVIEW Data Storage VIs
~
Simon H
Applications Engineer
National Instruments

Time stamp to name a TDMS file

Hi:
I am using data from excel files to create a time stamp, after that,my VI creates TDMS files with this data in files with 5000 samples, also I am using time stamp to named the TDMS files, but my problem is that my first file takes the name 180000.000, How can I modify this? because I need my file´s name will be the first data from excel.
I attached my VI and two excel files, the idea is that the first file will be 84327.500 and the second will be 84740.950
Attachments:
test1.xlsx ‏150 KB
test2.xlsx ‏151 KB
testfile.vi ‏56 KB

First, let me congratulate you on taking your first steps to learning LabVIEW. If you have not already done it, I highly recommend you go through the online tutorials. You have an actual project to work on, so application of what you learn will be fairly immediate.
For your actual program issue, you need to read the data from the Excel file and convert it to a timestamp before you set your filename. The order of operation of your program is to set the TDMS file name while simulataneously reading from the Excel file. After you have already created the TDMS file, you convert the data to a timestamp and write this to your timestamp front panel control. Note that the first point you write to the TDMS file may or may not be what you think it is. It could easily be the same 180000.000 value you are using to name the TDMS file. You have what is known as a race condition. The order of operation between the read and write of the timestamp control is not known and can be variable. It is one of the reasons that you should NEVER use local variables to pass data around. Use wires. In LabVIEW, wires are the data and take the place of variables in a text base language. Front panel controls should be used only for user interace reasons. In your loop, you should wire the timestamp from its current conversion (wired into the timestamp on the front panel) directly to the TDMS write (currently wired from a local variable of timestamp).
A couple of other things. You do not need to convert your data arrays to matrices to index them. This can be done directly with Index Array from the array palette. This single primitive will replace the Array Subset, convert to matrix, and index matrix primitives.
You do not need to go through a string conversion to produce a timestamp. The Date/Time to Seconds primitive in the timing palette will do it directly. You will need to populate the cluster input.
When you posted your code, you did not include your subVIs. In the future, include all your VIs, either separately or in a ZIP file.
Finally, to solve your intial problem, use Index Array to pull the first row of data from the Excel file, then convert this to a timestamp using Date/Time to Seconds. Use this to create your TDMS file.
You may have noticed, if you do all this, you do not need your timestamp front panel control, other than as a simple monitor.
Good luck! Welcome to LabVIEW.
This account is no longer active. Contact ShadesOfGray for current posts and information.

Opening large tdms files in excel takes forever, can anything be done?

After recording some daq channels for 4 hours my file is 120mb large, with about 20columns of data and 150k rows. Opening this in excel takes at least 5min, several not responding screen fades, and growing fear that all my data is impossible to get to.
What can I do about this? Is there a split tdms file option I can use or a way to speed up excel maybe?
Solved!
Go to Solution.

The solution is to not make the TDMS files so large. Perhaps modify the code so it starts a new file every 1/2 hour or something. Could you post a screen shot of the part of the code that is doing the saving?
Something that just occurred to me is that the TDMS file format is optimized for writing - not reading so stuff is just sort of streamed into the file with an index keeping straight what goes with what. The results is a file where the data from individual channels can be very fragmented, like parts of a file on a hard drive. I think there is a routine for defraging a TDMS file. Alternately, you could save the data in a temporary file (not necessarily TDMS) and resave it to the final TDMS file after all the data is collected.
Mike...
Certified Professional Instructor
Certified LabVIEW Architect
LabVIEW Champion
"... after all, He's not a tame lion..."
Be thinking ahead and mark your dance card for NI Week 2015 now: TS 6139 - Object Oriented First Steps

Saving FFT PSD waveform to TDMS file maintaining x-axis scale

Hi all,
I'm having trouble saving a Power Spectral Density waveform to a TDMS file because the method I'm using is losing the x-axis (frequency) scaling. The only way I can get it to save is extracting the magnitude from the waveform and saving that in the TDMS file. This loses all the frequency information.
Does anyone know how I can save the PSD information in a TDMS file or failing that, any type of file?
Thank you,
Donners
Solved!
Go to Solution.
Attachments:
PSDs Frequency 2.JPG ‏89 KB
Data Calculations TDMS 4.zip ‏120 KB
Filtered Data.zip ‏240 KB

Hi,
As my understanding, you are trying to log the PSD to "Power Spectral Density" channel, but you do it wrong with double array. TDMS write don't accept cluster as input, but accept waveform. I have updated the VI and the PSD in TDMS file viewed as
Attachments:
Data Calculations TDMS 4.vi ‏177 KB

How to call tdms file in DIAdem programatically using LabVIEW

Hi all,
I'm working on a project which has to acquire and stamp data in every 5 ms and store the data from the test cycle start up to almost a months' time. We have decided to store the data in the TDMS file format. We are going to use DIAdem for report generation. I'm new to NI diadem. So I need to know whether it is possible to acquire at the rate of 50Ks/s of around 15 channels and store data to the TDMS file and how we can call a TDMS file into DIAdem and generate reports in the HTML format.

Hi Jothiraja,
Yes, I think this is an excellent choice. In DIAdem you can just drag and drop the TDMS file from the NAVIGATOR tree view on the left into the Data Portal on the right in order to load the TDMS file. The REPORT panel in DIAdem has a "File >> HTML Export..." menu you can use to export your configured report in HTML format. Both the data loading and the HTML export can also be run programmatically in DIAdem, if you need to automate the reporting process.
On the LabVIEW side, how large is your acquisition buffer going to be? 1000 values on each of the 15 channels? 5000 values on each of the channels? If your acquisition buffers are going to be smallish, then you may want to consider creating a "NI_MinimumBufferSize" property on each of the 15 channels, assigning a value to this property that is the number of channel values you want to flush to disk at a time. The question here is how much of the resulting TDMS file will be stored data vs. binary buffer header information. If your resulting TDMS_Index file is tiny compared with its TDMS file, then you can ignore this tip. Alternatively, you could run the "TDMS Defragment.vi" at the end of the data acquisition, or equivalently load the acquired TDMS file into DIAdem and then re-save it over the original. In both of these cases you will get just one binary buffer at the top of the TDMS file, and all the rest of it will be stored data. Again, you can compare the size of the TDMS file with its TDMS_Index file to show you what the effect is.
TDMS is plenty fast enough to stream the 15 channels at 50kS/s that you propose, and I believe you will be very happy with the choice of TDMS as your file format and DIAdem as your reporting engine. I'll also be happy to help you through whatever obstacles you may run into along the way.
Brad Turpin
DIAdem Product Support Engineer
National Instruments

Scaling TDMS files

Hi,
Has anybody got a good example VI for scaling TDMS files. I've capured data using the VI attached and I want to scale this data to a new file using scaling slope and intercept derived from a calibration VI. I thought this would be straight forward but when I followed the example NI provide it does not change anything but the scaling information writen to the TDMS file properties. The data remains the same.
Thank you
Dan
Donners
Solved!
Go to Solution.
Attachments:
Data Aquisition Block Diagram.JPG ‏133 KB

Hi,
I've attached the signal conditioning VI that tries to scale the data from the 'Raw Data' group of the 'Raw Data' file to a 'Scaled Raw Data' group in a new 'Filtered Data' TDMS file. For some reason it saves a 'Raw Data' group in the new 'Filtered Data' file, that shows the new scale in the properties but the values have not been changed from the source 'Raw Data' file. I know that's a bit of a tongue twister, but I've attached the new 'Filtered Data' TDMS file that might illustrate what I'm talking about.
Thank you,
Dan
Donners
Attachments:
Signal_Conditioning_VI.JPG ‏471 KB

How to concatenate TDM files in DiaDem

I've seen the post on how to concatenate CSV files on DiaDem ... but how do you concatenate TDM files together?
I'm surprised this functionality isn't embedded into the software as it is a fairly common task, and the script is likely beyond most user's ability to maintain.
Solved!
Go to Solution.

Hi Brad,
Maybe I didnt explain myself that well, my fault. The case is:
As a result of acquired data post analysis with LabVIEW, I am logging into TDMS files 1.7GB of data. It's a file of 15 columns (properties) each of 1,080,000 rows ( properties values).
If I decide saving all the data into one file ( resulting into a 1.7GB file), DIAdem cannot load it into Data Portal. The program gets frozen even after waiting for 30mins.
If I save the data into multiple files (i.e like I tried last time in 3 files of around 500MB and one around 270MB) the 3 first files are loaded into data portal but when the loading of the 270MB is under way, DIAdem gives me an indexing error (sorry cant recall right now what is says exactly).
In the case of saving into multiple files, apparently I want to concatenate the TDMS file channels so I can i.e graph plots for the whole duration of my test. A reappending VBScipt you kindly provided me, works fine with any file I used that was not as massive as the ones I am dealing now. When I am using it with the above mentioned files, in the end I just get a time channel and none of the channels in my TDMS files.
Using a VBScipt that requires that I load my data into Data Portal before running it, it's simply impossible as DIAdem stalls as I mentioned above.
Sorry, I havent been using scipting before so I might be missing something here. As it goes for those changes you suggested. i will give it a try but could you please confirm which scipt we are talking about now exactly? As for concatenate files, the code Herbert provided in that thread is great but it does nor address exactly my problem.
Thanks,
Panos
Message Edited by Saloutios on 06-14-2010 04:27 AM

Split a TDMS file

Hi,
I would like to record 32 signals in TDMS file.
But I want to acquire for example 50 000 points per files. I made a VI which do this but I have a problem because for one file, I can have 50 000 points for one channel et the double , 100 000 for the other channel, I don t know how i t s possible because I limited to 50 000 points.
Maybe I made a mistake in my code, could you help me please
I put my VI in attachment file.
Thank you very much
Romaric GIBERT
Attachments:
final4.vi ‏282 KB
Log_Channels_(SubVI).vi ‏15 KB

The solution is to not make the TDMS files so large. Perhaps modify the code so it starts a new file every 1/2 hour or something. Could you post a screen shot of the part of the code that is doing the saving?
Something that just occurred to me is that the TDMS file format is optimized for writing - not reading so stuff is just sort of streamed into the file with an index keeping straight what goes with what. The results is a file where the data from individual channels can be very fragmented, like parts of a file on a hard drive. I think there is a routine for defraging a TDMS file. Alternately, you could save the data in a temporary file (not necessarily TDMS) and resave it to the final TDMS file after all the data is collected.
Mike...
Certified Professional Instructor
Certified LabVIEW Architect
LabVIEW Champion
"... after all, He's not a tame lion..."
Be thinking ahead and mark your dance card for NI Week 2015 now: TS 6139 - Object Oriented First Steps

Timing problems reading tdm files

Hello NI community,
my first post because of a very annoying problem with the Storage VIs from the File I/O VIs and Functions palette. I spent a long time to create a program for analyzing tdm files and I spent almost the same time trying to fix this problem now
My program opens a single tdm file, reads in the data and analysis it, displays the result (e. g. 10 DBL values) and closes the tdm file afterwards, then it opens the next tdm file... .
The Problem is, that the execution time increases permanently e. g. starting at 50 ms after 4000 tdm files read it takes about 1 s! So it takes days to read in more than 10000 tdm files. Also it takes many minutes to close the program after reading many (e. g. 4000) files!
Maybe the Storage VIs store the data in the background on a server or something else and do not release this data after closing the tdm file.
Has anyone an idea how to fix this problem? How to release all resources after closing the tdm file. Is there an alternative method to read in tdm files without using the buggy Storage VIs.
Converting tdm to tdms does not help, converting time increases the same way.
Wait time (0,5 s) after closing the tdm file does not help.
Settings for tdm VIs: open (read only)
LabView2011 SP1
Thanks in advance
Daniel

Hello Norbert,
thank you for your reply!
Attached you´ll find a simplified example for testing.
It reads the same .tdm file multiple times. The behavior is the same than in my application.
Copy the files on your computer, select the correct folder for the .tdm file in the VI and press start. You´ll see the execution time for opening the .tdm file, for reading the data and also for closing the .tdm file rising.
For example "Read data" duration on my computer:
Loop #:     Duration 2:   Factor to duration at start:     Stopping program:
1              19 ms                                                    < 5 s
1000         42 ms         2
2000         63 ms         3
4000         101 ms       5
8000         185 ms       10
10000       222 ms       12                                        > 3 min
The tdm-files I need to read in are with .bin data files and bigger. Reading lasts about 100 ms for the first tdm-file. The factor is almost the same like in this example. So it takes about 1 s after reading 6000 tdm-files.
Best Regards
Daniel
Attachments:
Read_tdmFileMultipleTimesTest.vi ‏876 KB
Read_tdmFileMultibleTimesTest.zip ‏1265 KB

How can I open a tdms file and replace a subset of data then save that change without re-writing the entire file again?

Hi all,
Is it possible to open a tdms file and make a small change an an array subset then save the file without having to save the whole dataset as a different file with a new name? That is to say, is there something similar to "Save" in MS Word rather than "Save As"... I only want to change a 1D array of four data points in a file of 7M data points.
I am not sure if this make sense? Any help is apreciated.
Thanks,
Jack

You can use either one, but for your application, I would use the synchronous. It requires far less setup. When you open the file, set both enable asynchronous and disable buffering to FALSE to enable you to use synchronous with arbitrary data sizes.
Attached code is LabVIEW 2011.
This account is no longer active. Contact ShadesOfGray for current posts and information.
Attachments:
UpdateTDMS.zip ‏20 KB

How to get the last data point from a TDM file in LabVIEW?

Hello,
I am using LabVIEW to analyze some rather large TDM files, and I need a way to get only the last data point. So far, the only way I have been able to accomplish this is by reading the entire file. Is there a property in the TDM file or a function in LabVIEW that will allow me to get the index of the last item in a channel?
Thanks!
Christina

Do you want to avoid reading whole file and want to be able to reach or get the index of last value of channel? is there any specific reason? I am not sure you could do it without loading the whole file. But the easiest way would be just to use array functions "array size" would give you the index of last element.
-Nilesh
Kudos are (always) welcome for the good post. :-)

Live Data / Problem with file permissions

Just trying out an old version of Dreamweaver MX 2004. I am
using my webhosting service for remote server/testing server
duties. It is running PHP 4.3.10 and MySQL 3.23.58. I was able to
set up the database connection and test-retrieve a recordset with
no problems. In following the tutorial I found that Livedata
wouldn't work, it just giving me a warning about file permissions
being wrong. It turns out that when Dreamweaver creates a temporary
file of the work-in-progress to upload to the remote server the
file is created on the server with owner=rw, group=rw, world=r
which explains why it won't run - group has to be set to group=r.
The file is created on the fly and then immediately deleted by
Dreamweaver so it is impossible to manually set the permission on
the server and probably fairly pointless too.
I tried just saving the file and previewing in the browser
which again causes it to be uploaded to the remote server. The
first time this resulted in the browser offering a file download
box instead of running the page. The reason is - again - that
Dreamweaver is setting the uploaded file permissions to include
group=rw. If I manually set the permission for group to group=r it
runs fine.
It turns out that Dreamweaver is always setting the file
permissions on file uploads (checked php and html) to the
remote/testing server to include group=rw. Once I set it manually
on the remote/testing server to group=r for a php file everything
is fine and subsequent uploads of the same file do not change it
again.
I checked with the webhosting company and their second-line
have reported back to me that the default file permission they set
on uploaded files includes group=r so it must be DW that is causing
the problem by setting group=rw the first time. I confirmed this by
using WS-FTP to upload the same file (renamed) to the same target
directory and the permissions set were owner=rw, group=r, world=r.
So
Can anyone please tell me how to change the permissions DW
sets on files written to a remote server because I have spent
countless hours on it without success. From looking at other posts
in this forum it could be that other users are hitting the same
kind of problem with DW8

Stop using Live Data with a hosting account. Set up PHP and
MySQL locally on
your machine. That is how it's supposed to work. You
shouldn't test files on
the fly on a host as you write them. Change your test account
in DW to use
the local server. Upload your files to your remote server
after they are
fully tested.
Tom Muck
http://www.tom-muck.com/
"nigelssuk" <[email protected]> wrote in
message
news:[email protected]...
> Just trying out an old version of Dreamweaver MX 2004. I
am using my
> webhosting
> service for remote server/testing server duties. It is
running PHP 4.3.10
> and
> MySQL 3.23.58. I was able to set up the database
connection and
> test-retrieve a
> recordset with no problems. In following the tutorial I
found that
> Livedata
> wouldn't work, it just giving me a warning about file
permissions being
> wrong.
> It turns out that when Dreamweaver creates a temporary
file of the
> work-in-progress to upload to the remote server the file
is created on the
> server with owner=rw, group=rw, world=r which explains
why it won't run -
> group
> has to be set to group=r. The file is created on the fly
and then
> immediately
> deleted by Dreamweaver so it is impossible to manually
set the permission
> on
> the server and probably fairly pointless too.
>
> I tried just saving the file and previewing in the
browser which again
> causes
> it to be uploaded to the remote server. The first time
this resulted in
> the
> browser offering a file download box instead of running
the page. The
> reason is
> - again - that Dreamweaver is setting the uploaded file
permissions to
> include
> group=rw. If I manually set the permission for group to
group=r it runs
> fine.
>
> It turns out that Dreamweaver is always setting the file
permissions on
> file
> uploads (checked php and html) to the remote/testing
server to include
> group=rw. Once I set it manually on the remote/testing
server to group=r
> for a
> php file everything is fine and subsequent uploads of
the same file do not
> change it again.
>
> I checked with the webhosting company and their
second-line have reported
> back
> to me that the default file permission they set on
uploaded files includes
> group=r so it must be DW that is causing the problem by
setting group=rw
> the
> first time. I confirmed this by using WS-FTP to upload
the same file
> (renamed)
> to the same target directory and the permissions set
were owner=rw,
> group=r,
> world=r.
>
> So
>
> Can anyone please tell me how to change the permissions
DW sets on files
> written to a remote server because I have spent
countless hours on it
> without
> success. From looking at other posts in this forum it
could be that other
> users
> are hitting the same kind of problem with DW8
>

How to store data (in tdm files)

I'm looking for advice on how to store data in tdm/tdx files.
The main challenge is like this: At regular time intervals there is new data available (say every 10 minutes there are 10 minutes of new data available). All data is time based. So every ten minutes I may create a new tdm/tdx file containing this data segment. However, when i want to analyze the data i dont necessarily want to view 10 minutes of data from all channels, but maybe 20 hours of data from one particular channel.
The way I've achieved this so far is to manually load each 10 minute segment of this particular channel and then add these parts together. This is both time consuming and cumbersome. Is there a better way to do this that I've simply not discovered yet? Is there a better way to store data to simplify this process?
One solution is of course to save data from several 10-minute frames in one file, but seeing as there is a never ending supply of data i cant simply save all data in one giant file, it has to be split up at some point, and the problem will still remain.
One factor to have in mind here is that this is rather large amounts of data (maybe 10GB each day), so the option to simply load all the data into memory goes out the window rather quickly.
Feel free to ask if I've not made myself very clear

Hi salte,
If your test ever ended, and if you had LabVIEW 8.20 or higher, I would recommend using a TDMS file, which handles data appeands flawlessly. DIAdem 10.1 now also does data reduction and index windowing during file loading for TDM / TDMS / DataPlugin files, so that you could easily load out only the part of the file you wanted to look at. But since you describe your data acquisition as never stopping and amassing 10 GB per day, I agree that it would be impractical to use only 1 data file. So we are stuck with some number of files which each contain a part of your measurement. This approach can have advantages, since you can save operational properties for each "buffer" such as average value, dominant frequency, ambient room temperature, etc., and later on you can use the DataFinder to query out only the data buffers which meet specific conditions based on these properties. The problem remains to load and assemble data based on multiple files. This is an old problem in DIAdem, and one for which I have an efficient and I hope satisfactory workaround application. It does what you describe already doing in the minimum amount of time and with the minimum amount of user interaction, and it can be highly parametrized to suit your particular situation. The ideal way to start the application would be as part of a ResultsList custom menu. This would enable you to query out the buffers you wanted, highlight those rows in the ResultsList, right-click and choose your custom menu, and WHAM! the selected buffers for your queried channel(s) are automatically appended together in the DataPortal. Launching from a ResultsList custom menu would mean that you could skip the file dialog and just read out the data sources directly from the ResultsList selection.
Let me know what you think,
Brad Turpin
DIAdem Product Support Engineer
National Instruments
Attachments:
Importing Data from Multiple DataPlugin Files.zip ‏198 KB

Concatonat​e TDMS file data to live data

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