How to start a new TDMS file after n seconds

[mw42]

Hello community,

how would I go about splitting TDMS files after a fixed period of time (I use the CML DQMH template)?

I already have an idea and would like to ask for feedback:
- open Logger module
- in the Message Handling Loop (MHL) I would duplicate the "Initialize File" case and rename it to "Next File" (and change status code etc.)
- next, I would add a helper loop with a timeout of my desired time interval
- then, have the Helper Loop in the timeout case send the message to call "Next File" (in MHL)

Is that a reasonable approach or am I missing something important (maybe this will not produce the exact time duration or something)?

Thanks

Martin

[Enrique.Noe]

Hello, if you are using the CML template, please note that the ´log Data´ request is being called by the helper loop in the acquisition module, so who really controls the log time is the acquisition module, The approach of adding a helper loop in the logging module is correct only to change the TDMS file handler every so often. I think your proposal looks good.

Cheers,

Enrique

[joerg.hampel]

Without knowing much about the CML example (frankly I never cared to look at it in detail), do you need the helper loop? Can't you do the time measurement directly in the 'log data' MHL case?

[Hooovahh]

I don't use DQMH, but this thread got my attention because of the title.  I made a TDMS toolkit that I posted on VIPM.IO called the Tremendous TDMS package.  It has a bunch of TDMS tools with the ability to make a new file based on the time of day, based on the size, based on frequency, or a circular buffer.

https://www.vipm.io/package/hooovahh_tremendous_tdms/

And here is a video demonstrating how to use some of the toolkit.

https://youtu.be/4nSz8UR2XfI