View multiple TDMS files at once?

We have to store data from 2 channels in 2 seperate TDMS files, but I need to view/analyze them togther. How can I open two or more TDMS files at the same time?
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Which solution do you mean? Diadem or rolling your own reader?
You could code up a very nice system to read TDMS files but keep in mind that TDMS is kind of a database in itself. If you want to store to Citadel it might be best to just write your data as a BLOB of variants. You'd still have to code something to pull the raw data out, decode it back into the original data and dislay it though.
Using LabVIEW: 7.1.1, 8.5.1 & 2013

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Query multiple TDMS Files

Hi,
I would like to evaluate the option of using TDMS files instead of an SQL database.
I will need to simply extract/query results that follow some conditions from multiple TDMS files.
I found many articles but could not find one example of how to extract data from multiple tdms files.
Should I have Data Finder or DIADEM ? or can I simply use LabVIEW ?
I am attaching a simple VI that generates 50 TDMS files (at the same folder as the VI), with "random" properties ('Title' and 'Type') and "random" data colums ('Temperature', 'Channel', 'Power').
Save the VI in a new folder and Run it. it will generate 50 TDMS files (see block diagram).
Now, considering those files, (for example) how can one extract only the the data where Test='Test2' and Type='Type1' and (Temperature=25 or Power>0.4) ?
Amitai.
Attachments:
TDMS_Write_Random_Files.vi ‏15 KB

Hooovahh wrote:
The DataFinder toolkit is awesome when dealing with TDMS report indexing. Lots of good stuff can be done with report look ups. Find me a report that was made after this date, before this date, made on this PC, running this version of software, for a UUT ran in this nest location, with this operator name, that failed. Queries like that can be made very easily once the indexing is complete.
As for pricing. It is included with the developer suite, but I'm pretty sure it isn't included with any professional, or full package. If you go to a page like the PID Fuzzy Logic Toolkit you'll see in bold at the top it says it is included with Full and Professional.
http://sine.ni.com/nips/cds/view/p/lang/en/nid/209054
The DataFinder page doesn't have this.
http://sine.ni.com/nips/cds/view/p/lang/en/nid/209062
Oh and there are several examples found in the Example Finder. Download a trial and see if it is worth it.
According to here, the DataFinder Toolkit is an add-on that is included in the Developer Suite. So it looks like Hooovahh is correct.
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Read multiple tdms files

Two questions:
1) how can i rename the different signals in the tdms file? Now they are names "untitled x". I am looking for an elegant solution, because i record about 200 different Signals.
2) Is there an "easy way" to select, read and concatenate multiple TDMS files to show them in a graph?

I had a similar goal with grouping plots and rearranging them on the X-axis, so I put together this pretty quickly to search a range of TDMS files for a specific channel, should be able to adapt it pretty easy to suit your needs, once you manage to rename your channels.
Attachments:
Record Grouping.vi ‏48 KB

How can I print multiple PDF files at once using Windows 7?

How can I print multiple PDF files at once, on an HP LJ Pro 400 xcolocr printer without opening each
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I am sorry, but to get your issue more exposure I would suggest posting it in the commercial forums since this is a commercial printer. You can do this at http://h30499.www3.hp.com/hpeb/
I hope this helps.
Please click “Accept as Solution ” if you feel my post solved your issue, it will help others find the solution.
Click the “Kudos Thumbs Up" on the right to say “Thanks” for helping!
Gemini02
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How do I select more then one channel to view in tdms file viewer graph panel

I have a TDMS file that I can view with the labview 2013 TDMS file viewer and I can select one signal out of 15 signals to view on the graph panel. however I would like be able to look at 2 or 3 signals
on the same graph but can't seem to be able to select more then one signal at a time. Is there a way to select more then one to view?

I've modified the TDMS viewer in the past to allow selecting multple channels. It's a little bit of a pain because the tree control in the viewer only allows you to select one item. You have to edit the tree to allow multiple items. Now your selection is an array instead of a scalar. This means the rest of the code has to be updated, and the references to the tree in subVIs need to be updated. Not impossible but it takes some time. Alternativly open it in Excel with the free add-in then you can select the two columns you want and insert a graph. Not as simple for the user but using Excel, which users should be familiar with might mean users need less training on data files.
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Problem opening multiple .tdms files in subroutine

Heya-
I'm using LabVIEW 8.2, professional development system.
I'm using the Open / Read / Close TDMS functions as part of a subroutine in a larger program. The subroutine is supposed to open one of several TDMS files (each of which contains bulk data saved previously), extract the data, then restructure into a 3D array, which is passed back to the main program. The particular file TDMS file to open is controlled by the main program. The TDMS Close function is used after the data is extracted.
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Attached are the subVI (TDMS_to_3D_array), a quick test program that uses the subVI, and a .zip of two data sets
Not sure if the global variables located in the SubVI will default, so they are: UpperMaxCol: 55, UpperMinCo: 0, UpperMaxPixel: 48, UpperMinPixel: 6
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Dan
Attachments:
Data.zip ‏1060 KB
TDMS_to_3D_array.vi ‏54 KB
TDMS_loadfault_tester.vi ‏39 KB

Hi Dan,
Perhaps you would try a few things.
Use the TDMS Flush VI in the subVI before the TDMS Close VI.
Try running the program with the subVI open.
Wire the TDMS File refnum from the subVI back to the parent and observe its value as the program switches between TDMS files.
Perform the TDMS read in the parent VI, wire the TDMS Data and the Array Size of the TDMS dataset to the subVI. Does this make any difference?
Try the subVI without the Channel Name string indicator.
Include error cluster wires throughout the entire subVI. Wire them through the TDMS VIs, then through the nested For structures, and then back to the parent VI.
Let us know what happens.

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Message was edited by: sterlingfive

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View multiple TDMS files at once?

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